01650nas a2200229 4500008004100000022001400041245007500055210006900130260010600199300001200305490000700317520083300324653001901157653001101176653003101187653001301218100001901231700002001250700001801270700002301288856010901311 2005 eng d a0025-540800aX-ray photoelectron spectroscopic investigations of Cu2O nanoparticles0 aXray photoelectron spectroscopic investigations of Cu2O nanopart aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcAPR a694-7000 v403 a

Cuprous oxide nanoparticles of five different sizes were obtained by electrochemical as well as chemical routes. Various capping agents were used to passivate the nanoparticles. X-ray diffraction studies show formation of single phased, cubic Cu2O nanoparticles. X-ray photoelectron spectroscopic studies indicate formation of CuO phase on the surface of Cu2O nanoparticles for uncapped as well as for those, capped by tetraoctylammonium bromide. On the other hand polyacrylamide and polyvinyl pyrrolidone capped samples did not show presence of CuO. X-ray photoelectron spectroscopy also indicates formation of a Cu2+ complex with the capping material on the surface of Cu2O nanoparticles. The results were discussed in terms of capability of passivation of various additives. (c) 2005 Elsevier Ltd. All rights reserved.

10aNanostructures10aOxides10aphotoelectron spectroscopy10aSurfaces1 aNikesh, V., V.1 aMandale, A., B.1 aPatil, K., R.1 aMahamuni, Shailaja uhttps://library.ncl.res.in/content/x-ray-photoelectron-spectroscopic-investigations-cu2o-nanoparticles-002013nas a2200229 4500008004100000022001400041245011800055210006900173260010600242300001400348490000700362520110200369653002301471653003101494653001101525653003101536100002401567700001801591700001801609700002601627856013001653 2012 eng d a0025-540800aNovel microwave assisted sol-gel synthesis (MW-SGS) and electrochromic performance of petal like h-WO3 thin films0 aNovel microwave assisted solgel synthesis MWSGS and electrochrom aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcJUL a1787-17930 v473 a

Use of domestic microwave oven is first time employed for chemical deposition of nanocrystalline hexagonal WO3 (h-WO3) thin films. Low cost precursors like sodium tungstate, hydrochloric acid, oxalic acid and potassium sulfate signifies cost effectiveness of this thin film fabrication route. Scanning electron microscopy images reveal formation of petal like nanodisks. A number of analytical techniques were used to characterize the WO3 petal like nanodisks, including X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX). X-ray photoelectron spectroscopy, FT-IR spectroscopy, Raman scattering spectroscopy, UV-visible spectrophotometry and cyclic voltammetry (CV). The X-ray photoelectron spectroscopic studies revealed 2.89 O/W atomic ratio. The electrical transport studies on WO3 thin films show semiconducting behavior with n-type semiconductivity. The value of determined coloration efficiency is 57.90 cm(2)/C. The mechanism of Li+ intercalation and deinercalation in h-WO3 matrix is proposed for enhanced electrochromism. (C) 2012 Elsevier Ltd. All rights reserved.

10aChemical synthesis10aElectrochemical properties10aOxides10aphotoelectron spectroscopy1 aKharade, Rohini, R.1 aPatil, K., R.1 aPatil, P., S.1 aBhosale, Popatrao, N. uhttps://library.ncl.res.in/content/novel-microwave-assisted-sol-gel-synthesis-mw-sgs-and-electrochromic-performance-petal-h-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-001374nas a2200253 4500008004100000022001400041245010500055210006900160260007700229300001400306490000700320520041200327653002800739653001900767653002100786653003100807653002700838100001900865700002300884700003000907700002900937700002400966856013000990 2015 eng d a1433-785100aSBA-15-oxynitrides as a solid-base catalyst: effect of nitridation temperature on catalytic activity0 aSBA15oxynitrides as a solidbase catalyst effect of nitridation t aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcMAY a5985-59890 v543 a

Solid bases, such as SBA-15-oxynitrides, have attracted considerable interest for potential applications as catalysts in important industrial processes. Reported herein is that by simply tuning the temperature of nitridation (ammonolysis), the catalytic activity of these solid bases can be enhanced. Solid-state NMR spectroscopy and XPS studies provided the reasoning behind this change in activity.

10aheterogeneous catalysis10aNanostructures10aNMR spectroscopy10aphotoelectron spectroscopy10asolid-state structures1 aSingh, Baljeet1 aMote, Kaustubh, R.1 aGopinath, Chinnakonda, S.1 aMadhu, Perunthiruthy, K.1 aPolshettiwar, Vivek uhttps://library.ncl.res.in/content/sba-15-oxynitrides-solid-base-catalyst-effect-nitridation-temperature-catalytic-activity-002754nas a2200253 4500008004100000022001400041245014800055210006900203260000800272300001400280490000700294520185500301653002802156653001902184653003102203653000902234653001802243100002302261700001702284700001702301700002602318700003002344856012602374 2022 eng d a2168-048500aSustainable CO2 reduction on in (2)O(3 )with exclusive CO selectivity: catalysis and in situ valence band photoelectron spectral investigations0 aSustainable CO2 reduction on in 2O3 with exclusive CO selectivit cMAR a3521-35310 v103 a

This study demonstrates a sustainable catalytic CO2 conversion to near 100% CO selectivity at ambient pressure on In2O3. Critically, high CO yield could be observed at the cost of undesired methanation, using a lower than stoichiometric amount of hydrogen in the feed; 1:1 and 1:0.67 CO2:H-2 ratios exhibit 98-99.6% CO selectivity with 25-38% CO2 conversion between 773 and 873 K. CO2 and H-2 conversion under steady-state conditions at 773-873 K suggests a 1:1 ratio of adsorbed reactants (with 1:0.67 CO2:H-2 feed) on the catalyst surface, underscoring the presence of an ideal reactant composition for the reverse water-gas shift reaction, while H-2-rich feed compositions show the H-2-dominated surface. Surface electronic structure changes, under near-operating conditions, were explored with near ambient pressure photoelectron spectroscopy (NAPPES), and the interesting findings are as follows: (a) A shift in the valence band to lower binding energy, up to 0.6 eV, was observed because of electron filling at high temperatures. (b) An observation of heterogeneous nature of the catalyst surface under NAPPES measurement conditions is attributed to the generation of active oxygen vacancy (O-v) sites, which in turn changes the work function of In2O3. (c) The above changes are found to be reversible, when the reaction was stopped. Vibrational features of the reactant molecules were observed to be broadened in the active temperature window of the catalyst supporting the heterogeneous character of the catalyst surface because of dynamic O-v generation. By optimizing gas hourly space velocity, CO2:H-2 ratio, and reaction temperature, exclusive CO selectivity is possible with a H-2:CO2 ratio of similar to 0.67, which will avoid the product separation stage altogether, while minimizing the expensive H-2 in the reactant feed.

10aheterogeneous catalysis10aOxygen vacancy10aphotoelectron spectroscopy10aRWGS10aWork function1 aMhamane, Nitin, B.1 aChetry, Sibo1 aRanjan, Ravi1 aRaja, Thirumalaiswamy1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/sustainable-co2-reduction-2o3-exclusive-co-selectivity-catalysis-and-situ-valence-band