02493nas a2200277 4500008004100000022001400041245011500055210006900170260010600239300001600345490000700361520148700368653001501855653001201870653002401882653001701906653001901923100002401942700002201966700001801988700002302006700002102029700001802050700001702068856013002085 2011 eng d a0360-319900aSurfactant tunable hierarchical nanostructures of CdIn2S4 and their photohydrogen production under solar light0 aSurfactant tunable hierarchical nanostructures of CdIn2S4 and th aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcSEP a11628-116390 v363 a

The hierarchical nanostructures of CdIn2S4 were selectively prepared through hydrothermal process in the presence of different surfactants. Structural study demonstrated existence of cubic spinel structure and micro structural study shown a pretty marigold flower like morphology without any surfactant. The effect of surfactants on the morphology and microstructure of CdIn2S4 has been studied by using Polyvinyl pyrrolidone (PVP) and Cetyltrimethyl ammonium bromide (CTAB) as a surfactants. The CdIn2S4 bipyramids with length of 0.7-1 mu m have been obtained using PVP. Interestingly, the nanopetals (thin and transparent) of CdIn2S4 are self assembled into hollow spheres in the presence of CTAB. Considering the importance of these unique nanostructures, the growth mechanism has also been proposed. The optical properties demonstrated the band gap in the range of 2.12-2.29 eV which is well within the visible region. In this contest, photocatalytic activity for hydrogen production using the above nanostructures under visible light was also demonstrated. The prima-fascia observations shows that the bipyramidal CdIn2S4 exhibit excellent photocatalytic activity for hydrogen production (3238 mu molh(-1)) than other nanostructures. Being a nanostructured semiconductor chalcogenide with a good stability will also have potential applications in solar cells and LED. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

10aBipyramids10aCdIn2S410aHydrogen generation10ahydrothermal10aSelf-assembled1 aBhirud, Ashwini, P.1 aChaudhari, Nilima1 aNikam, Latesh1 aSonawane, Ravindra1 aPatil, Kashinath1 aBaeg, Jin-Ook1 aKale, Bharat uhttp://library.ncl.res.in/content/surfactant-tunable-hierarchical-nanostructures-cdin2s4-and-their-photohydrogen-production-002811nas a2200205 4500008004100000022001400041245014100055210006900196260011000265300001400375490000600389520194400395100002402339700002602363700002402389700002602413700001802439700002102457856012702478 2015 eng d a2040-336400aSitu preparation of N-TiO2/graphene nanocomposite and its enhanced photocatalytic hydrogen production by H2S splitting under solar light0 aSitu preparation of NTiO2graphene nanocomposite and its enhanced aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcFEB a5023-50340 v73 a

Highly monodispersed nitrogen doped TiO2 nanoparticles were successfully deposited on graphene (N-TiO2/Gr) by a facile in-situ wet chemical method for the first time. N-TiO2/Gr has been further used for photocatalytic hydrogen production using a naturally occurring abundant source of energy i.e. solar light. The N-TiO2/Gr nanocomposite composition was optimized by varying the concentrations of dopant nitrogen and graphene (using various concentrations of graphene) for utmost hydrogen production. The structural, optical and morphological aspects of nanocomposites were studied using XRD, UV-DRS, Raman, XPS, FESEM, and TEM. The structural study of the nanocomposite shows existence of anatase N-TiO2. Further, the details of the components present in the composition were confirmed with Raman and XPS. The morphological study shows that very tiny, 7-10 nm sized, N-TiO2 nanoparticles are deposited on the graphene sheet. The optical study reveals a drastic change in absorption edge and consequent total absorption due to nitrogen doping and presence of graphene. Considering the extended absorption edge to the visible region, these nanocomposites were further used as a photocatalyst to transform hazardous H2S waste into eco-friendly hydrogen using solar light. The N-TiO2/Gr nanocomposite with 2% graphene exhibits enhanced photocatalytic stable hydrogen production i.e. similar to 5941 mu mol h(-1) under solar light irradiation using just 0.2 gm nanocomposite, which is much higher as compared to P25, undoped TiO2 and TiO2/Gr nanocomposite. The enhancement in the photocatalytic activity is attributed to `N' doping as well as high specific surface area and charge carrier ability of graphene. The recycling of the photocatalyst shows a good stability of the nanocomposites. This work may provide new insights to design other semiconductor deposited graphene novel nanocomposites as a visible light active photocatalyst.

1 aBhirud, Ashwini, P.1 aSathaye, Shivaram, D.1 aWaichal, Rupali, P.1 aAmbekar, Jalindar, D.1 aPark, Chan-J.1 aKale, Bharat, B. uhttp://library.ncl.res.in/content/situ-preparation-n-tio2graphene-nanocomposite-and-its-enhanced-photocatalytic-hydrogen-002034nas a2200193 4500008004100000022001400041245017900055210006900234260011000303300001600413490000600429520117400435100002401609700002201633700002001655700001901675700001701694856012901711 2015 eng d a2050-748800aSitu preparation of N-ZnO/graphene nanocomposites: excellent candidate as a photocatalyst for enhanced solar hydrogen generation and high performance supercapacitor electrode0 aSitu preparation of NZnOgraphene nanocomposites excellent candid aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJUL a17050-170630 v33 a

We have demonstrated a facile in situ wet chemical method to synthesize nanostructured nitrogen doped ZnO/Graphene (N-ZnO/GR) nanocomposites for the first time. Nitrogen doped ZnO over graphene (N-ZnO/GR) was studied using various concentrations of graphene. During the synthesis of N-ZnO/GR nanocomposites, in situ formation of graphene via GO reduction and formation of 4-9 nm N-ZnO have been demonstrated. The composite N-ZnO/GR absorbs in the visible region and this property is used for the photocatalytic reaction to transform hazardous H2S waste into eco-friendly hydrogen using solar light. The N-ZnO/GR nanocomposite with 0.3% graphene exhibits an enhanced photocatalytic stable hydrogen production rate i.e. similar to 5072 mu mol h(-1) under visible light irradiation. It is noteworthy that the N-ZnO/GR electrode exhibits a high specific capacitance of 555 F g(-1) and excellent cyclic performance with nearly 96.20% capacity retention after 2000 cycles at a current density of 10 A g(-1). These results indicate great potential applications of N-ZnO/GR in developing high hydrogen production and supercapacitors with high energy and power densities.

1 aBhirud, Ashwini, P.1 aSathaye, Shivaram1 aWaichal, Rupali1 aPark, Chan-Jin1 aKale, Bharat uhttp://library.ncl.res.in/content/situ-preparation-n-znographene-nanocomposites-excellent-candidate-photocatalyst-enhanced-0