00924nas a2200253 4500008004100000022001400041245009700055210006900152260007700221300001400298490000600312653002100318653001900339653001300358653002100371653002000392100001800412700002000430700002100450700002400471700002400495700002500519856012600544 2012 eng d a1864-563100a3D Hexaporous carbon assembled from single-layer graphene as high performance supercapacitor0 a3D Hexaporous carbon assembled from singlelayer graphene as high aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcOCT a2159-21640 v510aElectrochemistry10aEnergy storage10agraphene10aporous materials10aSupercapacitors1 aYadav, Prasad1 aBanerjee, Abhik1 aUnni, Sreekuttan1 aJog, Jyoti, Prakash1 aKurungot, Sreekumar1 aOgale, Satishchandra uhttps://library.ncl.res.in/content/3d-hexaporous-carbon-assembled-single-layer-graphene-high-performance-supercapacitor-001702nas a2200253 4500008004100000022001400041245015800055210006900213260007700282300001200359490000700371520072600378653001501104653002101119653001501140653003001155653003001185100002101215700002401236700002401260700002401284700002001308856012001328 2013 eng d a0947-653900aPorous-organic-framework-templated nitrogen-rich porous carbon as a more proficient electrocatalyst than Pt/C for the electrochemical reduction of oxygen0 aPorousorganicframeworktemplated nitrogenrich porous carbon as a  aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcJAN a974-9800 v193 a

Porous nitrogen-rich carbon (POF-C-1000) that was synthesized by using a porous organic framework (POF) as a self-sacrificing host template in a nanocasting process possessed a high degree of graphitization in an ordered structural arrangement with large domains and well-ordered arrays of carbon sheets. POF-C-1000 exhibits favorable electrocatalytic activity for the oxygen-reduction reaction (ORR) with a clear positive shift of about 40 mV in the onset potential compared to that of a traditional, commercially available Pt/C catalyst. In addition, irrespective of its moderate surface area (785 m2?g-1), POF-C-1000 showed a reasonable H2 adsorption of 1.6 wt?% (77 K) and a CO2 uptake of 3.5 mmol?g-1 (273 K).

10aAdsorption10aElectrochemistry10afuel cells10aoxygen-reduction reaction10aporous organic frameworks1 aPachfule, Pradip1 aDhavale, Vishal, M.1 aKandambeth, Sharath1 aKurungot, Sreekumar1 aBanerjee, Rahul uhttps://library.ncl.res.in/content/porous-organic-framework-templated-nitrogen-rich-porous-carbon-more-proficient-002881nas a2200241 4500008004100000022001400041245014000055210006900195260007700264300001400341490000700355520195300362653001102315653002102326653002902347653001902376653003002395100002902425700002302454700002002477700002402497856011802521 2013 eng d a0947-653900aZeolitic imidazolate framework (ZIF)-derived, hollow-core, nitrogen-doped carbon nanostructures for oxygen-reduction reactions in PEFCs0 aZeolitic imidazolate framework ZIFderived hollowcore nitrogendop aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcJUL a9335-93420 v193 a

The facile synthesis of a porous carbon material that is doped with iron-coordinated nitrogen active sites (FeNC-70) is demonstrated by following an inexpensive synthetic pathway with a zeolitic imidazolate framework (ZIF-70) as a template. To emphasize the possibility of tuning the porosity and surface area of the resulting carbon materials based on the structure of the parent ZIF, two other ZIFs, that is, ZIF-68 and ZIF-69, are also synthesized. The resulting active carbon material that is derived from ZIF-70, that is, FeNC-70, exhibits the highest BET surface area of 262m2g-1 compared to the active carbon materials that are derived from ZIF-68 and ZIF-69. The HR-TEM images of FeNC-70 show that the carbon particles have a bimodal structure that is composed of a spherical macroscopic pore (about 200nm) and a mesoporous shell. X-ray photoelectron spectroscopy (XPS) reveals the presence of Fe-N-C moieties, which are the primary active sites for the oxygen-reduction reaction (ORR). Quantitative estimation by using EDAX analysis reveals a nitrogen content of 14.5wt.%, along with trace amounts of iron (0.1wt.%), in the active FeNC-70 catalyst. This active porous carbon material, which is enriched with Fe-N-C moieties, reduces the oxygen molecule with an onset potential at 0.80V versus NHE through a pathway that involves 3.3-3.8e- under acidic conditions, which is much closer to the favored 4e- pathway for the ORR. The onset potential of FeNC-70 is significantly higher than those of its counterparts (FeNC-68 and FeNC-69) and of other reported systems. The FeNC-based systems also exhibit much-higher tolerance towards MeOH oxidation and electrochemical stability during an accelerated durability test (ADT). Electrochemical analysis and structural characterizations predict that the active sites for the ORR are most likely to be the insitu generated NFeN2+2/C moieties, which are distributed along the carbon framework.

10aDoping10aElectrochemistry10ametal-organic frameworks10aNanostructures10aoxygen-reduction reaction1 aPalaniselvam, Thangavelu1 aBiswal, Bishnu, P.1 aBanerjee, Rahul1 aKurungot, Sreekumar uhttps://library.ncl.res.in/content/zeolitic-imidazolate-framework-zif-derived-hollow-core-nitrogen-doped-carbon-002837nas a2200337 4500008004100000022001400041245018300055210006900238260000900307300001200316490000800328520165900336653001501995653002602010653002102036653003402057653002402091100002102115700001202136700002302148700002202171700001802193700002802211700002402239700002302263700002402286700001902310700002302329700002202352856012502374 2018 eng d a0013-468600aPorous reduced graphene oxide modified electrodes for the analysis of protein aggregation. Part 2: Application to the analysis of calcitonin containing pharmaceutical formulation0 aPorous reduced graphene oxide modified electrodes for the analys cMAR  a364-3720 v2663 a

In part 1 (A. Vasilescu et al., Porous reduced graphene oxide modified electrodes for the analysis of protein aggregation. Part 1: Lysozyme aggregation at pH 2 and 7.4 Electrochem. Acta, 254 (2017) 375 -383) we proposed porous reduced graphene oxide coated glassy carbon electrode (GC/prGO) in combination with differential pulse voltammetry as a new analytical tool for aggregation studies of proteins. Lysozyme was used as a model to follow its aggregation by electrochemical means at pH 2 and pH 7.4, leading to the formation of amyloid and amorphous aggregates, respectively. Part 2 of this work widens the scope of this approach by investigating a biopharmaceutical product, as the aggregation of peptide based drugs affects their therapeutic activity and can induce allergic reactions in patients. The salmon polypeptide calcitonin (sCT) was chosen as an example of a bioactive peptide with limited pharmaceutical potential due to a tendency to form cytotoxic aggregates and amyloid fibrils. For practical applications, screen printed electrodes (SPE) and flexible electrodes (FE) modified with polydiallyldimethylammonium (PDDA) and prGO by using the layer-by-layer deposition technique have been developed for the detection of sCT. The results indicate that these electrodes can differentiate between formation of amyloid aggregates of calcitonin (2 mg mL(-1)) in citrate buffer to no aggregation in acetate buffer. It was further demonstrated that these electrodes are able to analyze a pharmaceutical drug product of low potency, Miacalcic (8.3 mu g mL(-1)), where no aggregation was observed. (C) 2018 Elsevier Ltd. All rights reserved.

10aCalcitonin10aDisposable electrodes10aElectrochemistry10aPorous reduced graphene oxide10aProtein aggregation1 aVasilescu, Alina1 aYe, Ran1 aBoulahneche, Samia1 aLamraoui, Sabrina1 aJijie, Roxana1 aMedjram, Mohamed, Salah1 aGaspar, Szilveszter1 aSingh, Santosh, K.1 aKurungot, Sreekumar1 aMelinte, Sorin1 aBoukherroub, Rabah1 aSzunerits, Sabine uhttps://library.ncl.res.in/content/porous-reduced-graphene-oxide-modified-electrodes-analysis-protein-aggregation-part-201993nas a2200205 4500008004100000022001400041245012600055210006900181260000800250520124400258653001101502653002101513653002801534653001301562653002001575100002101595700002001616700002401636856012701660 2019 eng d a1864-563100aGlycine-induced electrodeposition of nanostructured cobalt hydroxide: a bifunctional catalyst for overall water splitting0 aGlycineinduced electrodeposition of nanostructured cobalt hydrox cNOV3 a

Herein, an interconnected alpha-Co(OH)(2) structure with a network-like architecture was used as a bifunctional electrocatalyst for the overall water splitting reaction in alkaline medium. The complexing ability of glycine with a transition metal was exploited to form [Co(gly)(3)](-) dispersion at pH 10, which was used for the electrodeposition. High-resolution TEM, UV/Vis-diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy were used to confirm that the as-synthesized materials had an alpha-Co(OH)(2) phase. The electrocatalytic oxygen and hydrogen evolution activity of the glycine-coordinated alpha-Co(OH)(2) was found to be approximately 320 and 145 mV, respectively, at 10 mA cm(-2). The material required approximately 1.60 V (vs. reversible hydrogen electrode; RHE) to achieve the benchmark of 10 mA cm(-2) for overall water splitting with a mass activity of approximately 63.7 A g(-1) at 1.60 V (vs. RHE). The chronoamperometric response was measured to evidence the stability of the material for overall water splitting for up to 24 h. Characterization of the catalyst after the oxygen and hydrogen evolution reactions was performed by XPS and showed the presence of a Co-II/Co-III oxidation state.

10acobalt10aElectrochemistry10aheterogeneous catalysis10aHydrogen10awater splitting1 aShilpa, Nagaraju1 aNadeema, Ayasha1 aKurungot, Sreekumar uhttps://library.ncl.res.in/content/glycine-induced-electrodeposition-nanostructured-cobalt-hydroxide-bifunctional-catalyst02153nas a2200253 4500008004100000022001400041245013200055210006900187260000800256300001500264490000600279520124500285653003001530653002101560653002601581653003201607653003001639100001701669700002201686700001401708700002401722700002301746856013001769 2022 eng d a2365-654900aSingle-step synthesis of exfoliated Ti3C2Tx MXene through NaBF4/HCl etching as electrode material for asymmetric supercapacitor0 aSinglestep synthesis of exfoliated Ti3C2Tx MXene through NaBF4HC cMAY ae2022011660 v73 a

Two-dimensional Ti3C2Tx MXene, derived from the parent Ti3AlC2 phase, is considered a promising electrode material for electrochemical energy storage applications. Ti3C2Tx MXene synthesis methods often employ concentrated hydrofluoric acid (HF), which is harsh, corrosive, and hazardous to the environment. Herein, we report the preparation of Ti3C2Tx MXene following a new synthetic route under a mild reaction condition comprising an aqueous solution of NaBF4 and HCl. This etching environment at a moderate temperature of 130 degrees C effectively removes the Al layer of the Ti3AlC2 precursor, assisted by the in situ formed HF in the reaction medium. Electron microscopy images of the as-prepared Ti3C2Tx (MX-130) reveal a partially exfoliated nanosheet-like morphology. The material displays a specific capacitance of 262 F g(-1) (three-electrode assembly, 1 A g(-1), -0.85 to -0.25 V vs. Hg/Hg2SO4) in 1 M H2SO4 electrolyte. The achieved specific capacitance is superior to that of Ti3C2Tx prepared via the common HF-treatment (25 F g(-1)). Additionally, the potential application of the optimized MXene as a negative electrode material is demonstrated in a quasi-solid-state RuO2|MX-130 asymmetric supercapacitor device.

10aasymmetric supercapacitor10aElectrochemistry10aFluoride salt etchant10aLayered electrode materials10aTransition metal carbides1 aGhosh, Meena1 aSzunerits, Sabine1 aCao, Ning1 aKurungot, Sreekumar1 aBoukherroub, Rabah uhttps://library.ncl.res.in/content/single-step-synthesis-exfoliated-ti3c2tx-mxene-through-nabf4hcl-etching-electrode-material