00610nas a2200133 4500008004100000022001400041245010100055210006900156260007100225300001400296490000800310100003000318856012800348 2006 eng d a1520-610600aComment on ``Photoelectron spectroscopic investigation of nitrogen-doped titania nanoparticles''0 aComment on Photoelectron spectroscopic investigation of nitrogen a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcAPR a7079-70800 v1101 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/comment-photoelectron-spectroscopic-investigation-nitrogen-doped-titania-nanoparticles-101987nas a2200157 4500008004100000022001400041245009000055210006900145260007100214300001200285490000700297520137400304100001701678700003001695856010401725 2009 eng d a0897-475600aCombustion synthesis of triangular and multifunctional ZnO1-xNx (x <= 0.15) materials0 aCombustion synthesis of triangular and multifunctional ZnO1xNx x a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcJAN a351-3590 v213 a

The preparation and characterization of multifunctional ZnO1-xNx (x <= 0.15) via a simple solution combustion method is reported. ZnO1-xNx exhibits visible light absorption, thermal stability, nanometer-/ micrometer-sized triangular particles, and catalytic properties. X-ray diffraction studies of ZnO1-xNx, demonstrate that the lattice oxygen in ZnO is replaced by nitrogen without any major change in the wurtzite structure; however, charge compensation occurs, because of interstitial Zn atoms, as well as oxygen vacancies. Microscopic studies reveal the dominance of nanometer- and micrometer-sized triangles of ZnO1-xNx. UV-visible and Raman spectra indicate a midgap state, derived from N 2p states, and direct Zn-N interaction, respectively. Secondary ion mass spectrometry studies show the presence of N and ZnN species in the bulk and support the direct Zn-N interaction. Electron paramagnetic resonance (EPR) studies indicate the presence of a small amount of defects. Photocatalytic decomposition of rhodamine B, and anisole acylation at room temperature, highlights the effectiveness of ZnO1-xNx to catalysis applications. The aforementioned multifunctional characteristics suggest that ZnO1-xNx might be used in place of conventional ZnO for better control and that it might be explored for further applications in catalysis and optoelectronics.

1 aMapa, Maitri1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/combustion-synthesis-triangular-and-multifunctional-zno1-xnx-x-001450nas a2200217 4500008004100000022001400041245005000055210004800105260007100153300001400224490000800238520074200246100002000988700002301008700002201031700001701053700001801070700003201088700003001120856008201150 2010 eng d a1932-744700aCarbon dissolution and segregation in Pd(110)0 aCarbon dissolution and segregation in Pd110 a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAR a5060-50670 v1143 a

The bulk-surface diffusion of carbon in Pd(110) has been investigated using Molecular beams to examine the clean-off of carbon with gas-phase oxygen. The dominant product of the reaction above 600 K is CO CO, is only produced at much lower temperatures where the lifetime of adsorbed CO is significant. The segregation from the bulk Only Occurs at a measurable rate at >750 K, while loss of carbon into the bulk call occur at much lower temperatures. The reaction of carbon at high temperatures shows two regimes: (i) a non steady-state evolution of CO due to the clean-off of surface carbon already present on the surface, followed by (ii) a near steady-state reaction due to the continuous diffusion of carbon to the surface.

1 aBowker, Michael1 aCounsell, Jonathan1 aEl-Abiary, Kareem1 aGilbert, Lee1 aMorgan, Chris1 aNagarajan, Sankaranarayanan1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/carbon-dissolution-and-segregation-pd110-001866nas a2200229 4500008004100000022001400041245008200055210006900137260007700206300001200283490000600295520102500301653002801326653001401354653003101368653002201399653002501421100003001446700001501476700003201491856011301523 2015 eng d a1867-388000aCan we shift and/or broaden the catalysis regime towards ambient temperature?0 aCan we shift andor broaden the catalysis regime towards ambient  aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcFEB a588-5940 v73 a

An attempt was made to shift the temperature regime of oxidation catalysis towards ambient temperatures by employing surface modification (SM) as a handle. Systematic SM of Pd(111) was performed by O-atom diffusion into the subsurfaces. Virgin and modified Pd(111) catalysts were evaluated for CO oxidation. Typical CO poisoning observed on virgin surfaces was partially lifted, and ambient CO oxidation was observed on the modified surfaces. CO oxidation was followed by the molecular beam method and near-ambient pressure (NAP) photoelectron spectroscopy under different pressure regimes. UV valence band spectral analysis of the SM and the CO+O-2 reaction on modified Pd(111) surfaces under NAP conditions demonstrated changes in the electronic structures of the surfaces with a change in surface potential by 0.35eV and directly probed CO2 formation under the reaction conditions. Supported metal catalysts may be subjected to SM and evaluated for a shift in the catalysis regime for many different reactions.

10aheterogeneous catalysis10aOxidation10aphotoelectron spectroscopy10asurface chemistry10asurface modification1 aGopinath, Chinnakonda, S.1 aRoy, Kanak1 aNagarajan, Sankaranarayanan uhttps://library.ncl.res.in/content/can-we-shift-andor-broaden-catalysis-regime-towards-ambient-temperature-001854nas a2200157 4500008004100000245010600041210006900147260000800216300001600224490000600240520125700246100001801503700002301521700003001544856012201574 2016 eng d00aC-H activation of methane to formaldehyde on Ce1-xZrxO2 thin films: a step to bridge the material gap0 aCH activation of methane to formaldehyde on Ce1xZrxO2 thin films cDEC a3650–36560 v83 a

Ce1−xZrxO2 (CZ) thin films were prepared by a combination of sol–gel and spin-coating methods and were evaluated for the C−H activation of methane by using a molecular beam set-up with the aim to bridge the material gap. The C−H activation of methane begins at 950 K, and a Ce-rich CZ composition displays a high selectivity (4–12 %) to the partially oxidised product, formaldehyde. A 10–12 % selectivity towards HCHO with 1.6 % methane conversion was observed with methane-rich CH4/O2 reactant compositions at 1050 K. Short contact times, prevalent under molecular beam conditions, could be a possible reason for HCHO formation. Although combustion products were observed instantly upon shining the mixture of reactants on CZ surfaces, up to 20 s delay was observed before formaldehyde generation, which indicates that the oxygen vacancy migration contributes to the rate-determining step and the diffusion-controlled nature of the reaction. A burst in HCHO generation at the point of molecular beam opening, after beam-closed conditions, suggests that the diffusion of oxygen vacancies to the surface is the reason for HCHO formation. Kinetics results also indicate the necessity of reduction sites for HCHO generation.

1 aDubey, Anjani1 aKolekar, Sadhu, K.1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/c-h-activation-methane-formaldehyde-ce1-xzrxo2-thin-films-step-bridge-material-gap01545nas a2200157 4500008004100000245008400041210006900125260000800194300001400202490000600216520098800222100001801210700002301228700003001251856010601281 2016 eng d00aC-H activation of methane to syngas on MnxCe1-x-yZryO2 - a molecular beam study0 aCH activation of methane to syngas on MnxCe1xyZryO2 a molecular  cJUL a2296-23060 v83 a

Mn-doped ceria zirconia thin films (MnxCe1-x-yZryO2, MCZ) were employed as flat model catalyst surfaces for CH4 activation. MCZ films exhibit characteristics of single crystal and powder materials, such as smooth surfaces and porosity. From molecular-beam studies, it has been identified that the oxygen storage capacity increases with Mn content. Mutually exclusive observation of H2O or a mixture of products (CO2+ CO + H-2) occurs, when the reactants was allowed to react directly on MCZ, underscoring their formation or prevention (and consumption), respectively. The results suggest that there is competition and cooperation among different elementary reactions under complementary conditions. From a significant partial oxidation of CH4 through C-H activation, it is found that formation of syngas begins at 700 K and the reaction rate increases with increasing temperature. Kinetic evidences indicate that the reaction proceeds through a combustion-reformation pathway.

1 aDubey, Anjani1 aKolekar, Sadhu, K.1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/c-h-activation-methane-syngas-mnxce1-x-yzryo2-molecular-beam-study02927nas a2200325 4500008004100000245010200041210006900143260000800212490000600220520185800226653003302084653001302117653001202130653003002142653002002172653002502192653001802217653001402235653001002249653002102259653001602280653002002296653002002316653003902336100002302375700002902398700003002427700001802457856012602475 2017 eng d00aCopper Cobalt Sulfide Nanosheets Realizing a Promising Electrocatalytic Oxygen Evolution Reaction0 aCopper Cobalt Sulfide Nanosheets Realizing a Promising Electroca cSEP0 v73 a

Nanostructured CuCo2S4, a mixed metal thiospinel, is found to be a benchmark electrocatalyst for oxygen evolution reaction (OER) in this study with a low overpotential, a low Tafel slope, a high durability, and a high turnover frequency (TOF) at lower mass loadings. Nanosheets of CuCo2S4 are realized from a hydrothermal synthesis method in which the average thickness of the sheets is found to be in the range of 815 nm. Aggregated nanosheets form a highly open hierarchical structure. When used as an electrocatalyst, CuCo2S4 nanosheets offer an overpotential value of 310 mV at a 10 mA cm(2) current density, which remains consistent for 10000 measured cycles in a 1 M KOH electrolyte. A chronoamperometric study reveals constant oxygen evolution for 12 h at a 10 mV s(-1) scan rate without any degradation of the activity. Furthermore, the calculated mass activity of the CuCo2S4 electrocatalyst is found to be 14.29 A/g and to afford a TOF value of 0.1431 s(-1) at 310 mV at a mass loading of 0.7 mg cm(-2). For comparison, nanostructures of Co3S4 and Cu0.5Co2.5S4 have been synthesized using a similar method followed for CuCo2S4. When compared to the OER activities among these three thiospinels and standard IrO2, CuCo2S4 nanosheets offered the highest OER activities at the same mass loading (0.7 mg/cm(-2)). Extensive X-ray photoelectron spectroscopy and electron paramagnetic resonance analyses for a mechanistic study reveal that introduction of Cu into the Co3S4 lattice enhances the oxygen evolution and kinetics by offering Cu2+ sites for utilitarian adsorption of OH, O, and OOH reactive species and also by offering a highly active high-spin state of octahedral Co3+ for OER catalysis.

10aBifunctional Electrocatalyst10aCatalyst10aCuco2s410aEfficient Electrocatalyst10aelectrocatalyst10aElectronic-structure10aNanoparticles10aNanosheet10aoxide10aoxygen evolution10aperformance10aRecent Progress10aWater oxidation10aWater Splitting Hydrogen Evolution1 aChauhan, Meenakshi1 aReddy, Kasala, Prabhakar1 aGopinath, Chinnakonda, S.1 aDeka, Sasanka uhttps://library.ncl.res.in/content/copper-cobalt-sulfide-nanosheets-realizing-promising-electrocatalytic-oxygen-evolution01637nas a2200181 4500008004100000022001500041245009700056210006900153260000800222300001600230490000600246520100000252100002401252700000501276700001701281700003001298856012701328 2018 eng d a 2365-654900aCuOx-TiO2 composites: electronically integrated nanocomposites for solar hydrogen generation0 aCuOxTiO2 composites electronically integrated nanocomposites for cNOV a12022-120300 v33 a

CuOx-TiO2 (CT) composites were prepared by different methods (impregnation, microwave and photodeposition methods) and evaluated for solar water splitting (SWS) with aqueous methanol. CT composites prepared by three different methods were characterized by relevant methods to understand the correlation between synthesis method and activity, and the mechanism of water splitting. A comparison of photocatalytic activity of CT composite materials indicates that the photocatalyst prepared by photodeposition method shows significantly improved activity for hydrogen production from aqueous methanol as well as with water (overall water splitting) under one sun conditions. Cu is present in Cu/Cu+1 form in photodeposition method prepared CT, which is more effective and helpful for solar light absorption as well as charge carrier separation due to the formation of bulk p-n (Cu2O-TiO2) heterojunctions. However, CuO formation seems to decrease the activity with other preparation methods.

1 aBharad, Pradnya, A.1 a1 aThomas, Femi1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/cuox-tio2-composites-electronically-integrated-nanocomposites-solar-hydrogen-generation02296nas a2200253 4500008004100000022001400041245013400055210006900189260000800258300001200266490000800278520141400286653002001700653001701720653002301737653001901760653001901779100002301798700001801821700001901839700003001858700002301888856013101911 2019 eng d a0169-433200aCadmium sulfide nanostructures: influence of morphology on the photocatalytic degradation of erioglaucine and hydrogen generation0 aCadmium sulfide nanostructures influence of morphology on the ph cJUL a696-7050 v4833 a

Size and shape of inorganic materials are known to have great effects on their physical and chemical properties. Here, for the first time we report the visible light driven photocatalytic degradation of erioglaucine - a stable organic dye molecule in the presence of chemically synthesized nanoscale CdS with 1D (nanorods), 2D (nanosheets) and 3D (hierarchical) morphology. Visible light driven photocatalytic degradation efficiency of both 1D and 3D CdS in the removal of erioglaucine are identical. Surprisingly, with 5 min of sonication, the highly crystalline 3D CdS stacked with many thin nanowires containing numerous active surface sites exhibited fourfold enhanced photodegradation efficiency in comparison to 1D and 2D CdS. Scavenger studies revealed that electrons and superoxide radicals are primary reactive species involved in the photodegradation of erioglaucine, while cyclic photodegradation studies revealed the good stability of 3D CdS against photocorrosion. Further, the photocatalytic hydrogen evolution studies also revealed the excellent activity of 3D CdS in comparison to 1D and 2D CdS. Thus, we find that the morphology indeed influences the photocatalytic activity. These results reveal that 3D CdS nanostructures investigated in the present work are efficient photocatalysts that could be fine-tuned for both environmental remediation and hydrogen generation applications.

10aCadmium sulfide10aErioglaucine10aHydrogen evolution10aNanostructures10aPhotocatalysis1 aShenoy, Sulakshana1 aJang, Eunyong1 aPark, Tae, Joo1 aGopinath, Chinnakonda, S.1 aSridharan, Kishore uhttps://library.ncl.res.in/content/cadmium-sulfide-nanostructures-influence-morphology-photocatalytic-degradation-erioglaucine01969nas a2200265 4500008004100000022001400041245014300055210006900198260000900267300001600276490000700292520103800299653002001337653001801357653001901375653001301394653001901407100002101426700002801447700001701475700002101492700002901513700003001542856013101572 2020 eng d a1944-824400aCan half-a-monolayer of pt simulate activity like that of bulk pt? solar hydrogen activity demonstration with quasi-artificial leaf device0 aCan halfamonolayer of pt simulate activity like that of bulk pt  cJUL  a30420-304300 v123 a

Pt is the best cocatalyst for hydrogen production. It is also well-known that the surface atomic layer is critical for catalysis. To minimize the Pt content as cocatalyst, herein we report on half-a-monolayer of Pt (0.5 theta(Pt)) decorated on earth-abundant Ni-Cu cocatalyst, which is integrated with a quasiartificial leaf (QuAL) device (TiO2/ZnS/CdS) and demonstrated for efficient solar hydrogen production. For the QuAL, TiO2 is sensitized with ZnS and CdS quantum dots by the SILAR method. The 0.5 theta(Pt)-decorated Ni-Cu shows an onset potential of 0.05 V vs reversible hydrogen electrode for the hydrogen evolution reaction, which is almost similar to that of commercial Pt/C. Photoactivity of the present QuAL device with either bulk Pt or 0.5 theta(Pt)-coated Ni-Cu cocatalyst is, surprisingly, equal. Our findings underscore that a fraction of a monolayer of Pt can enhance the activity of the cocatalyst, and it is worth exploring further for the high activity associated with atomic Pt and other noble metals.

10aartificial leaf10anickel-copper10aPhotocatalysis10aplatinum10aSolar hydrogen1 aBajpai, Himanshu1 aPatra, Kshirodra, Kumar1 aRanjan, Ravi1 aNalajala, Naresh1 aReddy, Kasala, Prabhakar1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/can-half-monolayer-pt-simulate-activity-bulk-pt-solar-hydrogen-activity-demonstration-quasi01740nas a2200241 4500008004100000022001400041245008300055210006900138260000800207300001200215490000600227520098000233653001301213653002201226653001301248653001901261653001701280100001601297700002101313700002001334700003001354856011401384 2020 eng d a2367-198X00aCu-Ni bimetal integrated TiO2 thin film for enhanced solar hydrogen generation0 aCuNi bimetal integrated TiO2 thin film for enhanced solar hydrog cMAY a19005570 v43 a

A series of non-noble Cu-Ni bimetallic catalysts is prepared with different molar proportions of metals. Of these bimetallic catalysts, 1 wt% is subsequently integrated with titania P25. The catalysts are evaluated for solar hydrogen generation under 1 sun condition in both the powder and thin film forms. All the photocatalysts in the thin film exhibit an 8-24 times higher hydrogen yield (HY) compared with the corresponding particulate counterpart. The highest HY (41.7 mmol h(-1) g(-1)) is demonstrated for the photocatalyst Cu-Ni/TiO2 (CNT; 1:1 = Cu:Ni) in the thin film form, which is 24 times higher than that with its powder counterpart (1.75 mmol h(-1) g(-1)) and exceeds the performance of other Cu-Ni/TiO2 compositions. This enhanced activity in the thin film can be ascribed to improved absorption of visible light and an effective separation of photogenerated charge carriers at the interface of Cu-Ni/TiO2 leading to better charge carrier utilization.

10abimetals10aenergy conversion10aHydrogen10aPhotocatalysis10asolar energy1 aTudu, Bijoy1 aNalajala, Naresh1 aSaikia, Pranjal1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/cu-ni-bimetal-integrated-tio2-thin-film-enhanced-solar-hydrogen-generation01521nas a2200217 4500008004100000245013400041210006900175260000800244300001100252490000700263520073000270653002001000653002001020653001701040653002801057653001701085653001601102100002301118700003001141856013201171 2021 eng d00aCatalytic applications of hydrotalcite and related materials in multi -component reactions: concepts, challenges and future scope0 aCatalytic applications of hydrotalcite and related materials in  cSEP a1004580 v223 aHydrotalcites (HTs) are the potential substitute to conventional base catalysts. HTs are useful in efficient syntheses of various heterocycles, such as chromenes, pyrans, pyrazoles, triazoles, using multi-component reactions. This review focuses on the chemistry of HTs and particularly hydrotalcites and related materials in the synthesis of heterocycles. The effects of preparation method and, physico-chemical parameters, such as calcination, molar ratio of metals, role of intercalated ions, surface area, on the catalytic activities are discussed. Along with technical aspects, this review also unlocks various untouched areas in developing sustainable catalyst for syntheses of heterocycles, drugs, etc. for the future.10agreen chemistry10agreen synthesis10aheterocycles10aheterogeneous catalysis10ahydrotalcite10aMetal Oxide1 aBurange, Anand, S.1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/catalytic-applications-hydrotalcite-and-related-materials-multi-component-reactions-concepts01229nas a2200205 4500008004100000022001400041245011300055210006900168260000800237300001400245490000700259520049900266100001900765700001600784700002100800700001800821700003000839700002400869856013000893 2022 eng d a1359-734500aConcerted effect of Ni-in and S-out on ReS2 nanostructures towards high-efficiency oxygen evolution reaction0 aConcerted effect of Niin and Sout on ReS2 nanostructures towards cMAR a3689-36920 v583 a

Herein, a one-step hydrothermal reaction is developed to synthesize a Ni-doped ReS2 nanostructure with sulphur defects. The material exhibited excellent OER activity with a current density of 10 mA cm(-2) at an overpotential of 270 mV, a low Tafel slope of 31 mV dec(-1), and good long-term durability of 10 h in 1 M KOH. It shows high faradaic efficiency of 96%, benefiting from the rapid charge transfer caused by the concerted effect of Ni-in and S-out on the ReS2 nanostructure.

1 aDas, Tapas, K.1 aPing, Tapan1 aMohapatra, Manoj1 aAnwar, Shahid1 aGopinath, Chinnakonda, S.1 aJena, Bikash, Kumar uhttps://library.ncl.res.in/content/concerted-effect-ni-and-s-out-res2-nanostructures-towards-high-efficiency-oxygen-evolution01642nas a2200157 4500008004100000022001400041245011700055210006900172260000800241300001400249490000700263520102900270100002801299700003001327856012701357 2023 eng d a1359-734500aCO2 electrolysis towards large scale operation: rational catalyst and electrolyte design for efficient flow-cell0 aCO2 electrolysis towards large scale operation rational catalyst cJUN a6774-67950 v593 a

The electrochemical CO2 reduction reaction (CO2RR) to renewable fuels/chemicals is a potential approach towards addressing the carbon neutral economy. To date, a comprehensive analysis of key performance indicators, such as an intrinsic property of catalyst, reaction environment and technological advancement in the flow cell, is limited. In this study, we discuss how the design of catalyst material, electrolyte and engineering gas diffusion electrode (GDE) could affect the CO2RR in a gas-fed flow cell. Significant emphasis is given to scale-up requirements, such as promising catalysts with a partial current density of >= 100 mA cm(-2) and high faradaic efficiency. Additional experimental hurdles and their potential solutions, as well as the best available protocols for data acquisition for catalyst activity evaluation, are listed. We believe this manuscript provides some insights into the making of catalysts and electrolytes in a rational manner along with the engineering of GDEs towards CO2RR.

1 aPatra, Kshirodra, Kumar1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/co2-electrolysis-towards-large-scale-operation-rational-catalyst-and-electrolyte-design02553nas a2200265 4500008004100000022001400041245009700055210006900152260000800221300001100229490000800240520168600248653002701934653002801961653000901989653000801998653002002006100001702026700002102043700001602064700002302080700002602103700003002129856012802159 2023 eng d a1385-894700aCo3O4 for sustainable CO2 reduction and possible fine-tuning towards selective CO production0 aCo3O4 for sustainable CO2 reduction and possible finetuning towa cSEP a1444590 v4713 a

Two main challenges involved in heterogeneous catalytic CO2 reduction are: (a) decreasing the consumption of H2 to the minimum required level with possibly the maximum CO2 conversion, and (b) concurrently enhancing the selectivity of the desired CO, at the cost of methane. Towards meeting these two challenges, Co3O4 spinel has been identified as a potential catalyst and it exhibits predominant CO selectivity > 673 K at atmospheric pressure. CO2 conversion begins > 523 K, with 100% CO selectivity observed > 673 K with CO2:H2 = 3:2. Current work shows a sustainable catalytic CO2 conversion to 100% CO selectivity with Co3O4-Nanocube (NC). Critically, CO selectivity and yield is observed to increase at the cost of methane with smaller amount of H2. 1:1 and 3:2 CO2:H2 ratio exhibits 88-100% CO selectivity with 24-32.5% CO2 conversion between 623 and 823 K. Irrespective of the input CO2:H2, ratio of CO2:H2 uptake changes from around 1:3 at 523 K to 1:1-1.5 at 823 K with concurrent production of significant methane to predominant CO, respectively. Surface electronic state changes was explored by near ambient pressure photoelectron spectroscopy, and the results suggests that Co3O4 is the active phase that promotes CO2 reduction selectively to CO. Broadening observed with the vibrational feature of the CO2 molecules at high temperature underscores the heterogeneous character of the catalyst surface, under operating conditions, due to changing electron density. By optimizing the gas hourly space velocity (GHSV), H2-lean CO2:H2 ratio, and the reaction temperature/pressure, 100% CO selectivity could be broadened to a range of operating conditions.

10aCarbon neutral economy10aheterogeneous catalysis10aRWGS10aSDG10aSurface Science1 aRanjan, Ravi1 aTekawadia, Jyoti1 aJain, Ruchi1 aMhamane, Nitin, B.1 aRaja, Thirumalaiswamy1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/co3o4-sustainable-co2-reduction-and-possible-fine-tuning-towards-selective-co-production02334nas a2200241 4500008004100000022001400041245015100055210006900206260000800275490000700283520143700290653001901727653002501746653001801771653001101789653002101800100002101821700003101842700002901873700003001902700002801932856013201960 2025 eng d a1867-388000aCatalytic hydrogenation of cinnamaldehyde over nanocrystalline nickel-doped lanthanum aluminate: synergistic effect of nickel and oxygen vacancies0 aCatalytic hydrogenation of cinnamaldehyde over nanocrystalline n cJUN0 v173 a

Nickel-doped lanthanum aluminium perovskite, LaAl1-xNixO3-delta with x = 0, 0.1, 0.2, 0.3, 0.4,0.5, 0.6, and 0.75 (LANx), were obtained through a combustion method followed by a calcination process. The obtained LANx materials crystallized in the cubic structure by the Pm-3m (221) space group. The nanocrystalline nature of the LANx materials was confirmed by the average crystalline size determined using Debye-Scherrer formula. X-ray photoelectron spectroscopy (XPS) studies showed that nickel was present in the +2 and +3 oxidation states. The introduction of nickel resulted in distinct peaks in TPR in the temperature range of 200-600 degrees C, with an enhanced reducibility of the materials. The LANx materials were thoroughly assessed for their effectiveness in the hydrogenation of cinnamaldehyde. The maximum catalytic activity (cinnamaldehyde conversion of 98% with a hydrocinnamylalcohol selectivity 96.5%) was observed with the presence of the LAN7 catalyst at 150 degrees C for 6 h at a H2 pressure of 10 bar. The catalytic activity is maintained even after four cycles, which broadens the application scope as the material is sustainable, scalable, cost-effective, and a potential alternative to reported noble metal catalysts. The synergistic effect of nickel and oxygen vacancies in the catalyst improves the reducibility and provides a promising catalytic activity in the cinnamaldehyde hydrogenation.

10aCinnamaldehyde10aHydrocinnamylalcohol10aHydrogenation10aNickel10aPerovskite oxide1 aBhavisha, Meloth1 aBalamurugan, Sarkarainadar1 aVenkatesha, Naragalu, J.1 aGopinath, Chinnakonda, S.1 aSakthivel, Ayyamperumal uhttps://library.ncl.res.in/content/catalytic-hydrogenation-cinnamaldehyde-over-nanocrystalline-nickel-doped-lanthanum-aluminate02916nas a2200181 4500008004100000022001400041245018800055210006900243260000800312300001600320490000700336520218000343100002302523700001502546700001902561700003002580856012402610 2025 eng d a1359-734500aConcurrent utilization of e- and h+ for water splitting to H2 and biomass components into value-added products: sustainable solar-driven photocatalysis towards meeting SDG7, 12 and 130 aConcurrent utilization of e and h for water splitting to H2 and  cOCT a16738-167690 v613 a

Photocatalytic water splitting is considered one of the efficient methods for producing green hydrogen. However, the sluggish oxygen evolution reaction (OER) kinetics with four electrons limits the overall efficiency of water splitting. Biomass components/biomass derivatives are renewable carbon feedstocks that are abundantly available in nature. It is prudent to make use of electrons and holes concurrently in photocatalysis for H2 production and oxidation of biomass components, respectively, due to the latter's occurrence at a lower potential (<= 1 V) than that of the OER (>1.23 V), to value-added products (VAPs); this approach makes the entire process energy-efficient and kinetically superior. This potential approach could effectively utilize the charge carriers and abundant renewable resources of water and biomass simultaneously, meeting the sustainability, energy conversion and economic goals together. Parallel utilization of the charge carriers for redox reactions also enhances the sustainability of the catalyst system employed. Interestingly, biomass component oxidation to VAPs occurs in several steps, which not only enhances hole utilization but also provides an opportunity to design better catalysts to enhance the selectivity of the target products. Carrying out such reactions under aerobic or anaerobic conditions and different pH conditions allows fine-tuning of the product selectivity. The current review provides a detailed overview of the recent developments in this emerging area with three different types of photocatalyst systems, namely, oxide-, chalcogenide-, and carbon-based materials. Among these, the oxide-based systems generally demonstrate the highest activity with sustainability, maintaining performance for several hours. While many of these systems exhibited high selectivity towards a single product, 100% selectivity to lactic acid from glycerol was observed with a BiVO4-integrated TiO2 catalyst. Finally, the challenges, opportunities and future perspectives in this thriving field are listed, and they underscore the role of a carbon-neutral economy towards achieving a potentially sustainable future.

1 aRajendran, Sivaraj1 aSaju, Simi1 aMathew, Thomas1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/concurrent-utilization-e-and-h-water-splitting-h2-and-biomass-components-value-added04311nas a2200169 4500008004100000245019000041210007100231260000800302300001600310490000700326520358800333100002303921700001503944700001903959700003003978856013304008 2025 eng d00aConcurrent utilization of e− and h+ for water splitting to H2 and biomass components into value-added products: sustainable solar-driven photocatalysis towards meeting SDG7, 12 and 130 aConcurrent utilization of e− and h for water splitting to H2 and cSEP a16738-167690 v613 a

Photocatalytic water splitting is considered one of the efficient methods for producing green hydrogen. However, the sluggish oxygen evolution reaction (OER) kinetics with four electrons limits the overall efficiency of water splitting. Biomass components/biomass derivatives are renewable carbon feedstocks that are abundantly available in nature. It is prudent to make use of electrons and holes concurrently in photocatalysis for H2 production and oxidation of biomass components, respectively, due to the latter's occurrence at a lower potential (≤1 V) than that of the OER (>1.23 V), to value-added products (VAPs); this approach makes the entire process energy-efficient and kinetically superior. This potential approach could effectively utilize the charge carriers and abundant renewable resources of water and biomass simultaneously, meeting the sustainability, energy conversion and economic goals together. Parallel utilization of the charge carriers for redox reactions also enhances the sustainability of the catalyst system employed. Interestingly, biomass component oxidation to VAPs occurs in several steps, which not only enhances hole utilization but also provides an opportunity to design better catalysts to enhance the selectivity of the target products. Carrying out such reactions under aerobic or anaerobic conditions and different pH conditions allows fine-tuning of the product selectivity. The current review provides a detailed overview of the recent developments in this emerging area with three different types of photocatalyst systems, namely, oxide-, chalcogenide-, and carbon-based materials. Among these, the oxide-based systems generally demonstrate the highest activity with sustainability, maintaining performance for several hours. While many of these systems exhibited high selectivity towards a single product, 100% selectivity to lactic acid from glycerol was observed with a BiVO4-integrated TiO2 catalyst. Finally, the challenges, opportunities and future perspectives in this thriving field are listed, and they underscore the role of a carbon-neutral economy towards achieving a potentially sustainable future.

1 aRajendran, Sivaraj1 aSaju, Simi1 aMathew, Thomas1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/concurrent-utilization-e%E2%88%92-and-h-water-splitting-h2-and-biomass-components-value-added