02482nas a2200265 4500008004100000022001400041245010400055210006900159260010600228300001400334490000700348520153200355653002101887653001901908653001901927653002701946653000901973100001901982700002402001700001802025700001402043700001802057700001802075856012302093 2015 eng d a0360-319900aFacile gamma radiolytic methodology for TiO2-rGO synthesis: effect on photo-catalytic H-2 evolution0 aFacile gamma radiolytic methodology for TiO2rGO synthesis effect aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcMAY a5815-58230 v403 a

TiO2 (P25) decorated reduced graphene oxide (rGO) is synthesized by gamma-radiolytic technique using water-ethanol solvent medium. Visible light absorpdon was confirmed by UV-Visible spectroscopy. Photoluminescence (PL) study revealed a decline in electron-hole recombination rate signalled by a sharp fall in luminescence of TiO2. Under such scenario, electron transfer from TiO2 conduction band to the conjugated sheet becomes a preferred pathway in the presence of rGO, which is further confirmed by photocurrent measurement. TiO2 -rGO composite with 1 wt. % rGO was found to be the best composition in terms of visible light absorption, while retaining TiO2 crystallinity. Transmission electron microscopy and Raman spectroscopic studies confirmed the coating of rGO sheet with TiO2 nanoparticles. TiO2 -rGO was found to show about 150 times higher photocatalytic H-2 generation under 250 W UV-Visible light irradiation than pristine TiO2. In addition to this, TiO2 -rGO composite shows hydrogen production yield of 35 mu mol/h.g under visible light (lambda = 400 nm) irradiation. Thus gamma-radiolysis can be considered to be a viable technique, which helps in synthesizing photocatalytically active nanocomposite with high H-2 evolution rate. In the light of these interesting aspects, a detail investigation is carried out to study the effect of rGO concentration and illumination time on photocatalytic yield. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

10agamma-radiolysis10aH-2 production10aPhotocatalysis10aReduced graphene oxide10aTiO21 aGupta, Bhavana1 aMelvin, Ambrose, A.1 aMatthews, Tom1 aDhara, S.1 aDash, Sitaram1 aTyagi, A., K. uhttps://library.ncl.res.in/content/facile-gamma-radiolytic-methodology-tio2-rgo-synthesis-effect-photo-catalytic-h-2-002119nas a2200253 4500008004100000022001400041245008000055210006900135260010600204300001400310490000700324520123900331653002201570653002401592653001801616653001901634653000901653100001901662700002401681700001801705700001801723700001801741856010601759 2016 eng d a1364-032100aTiO2 modification by gold (Au) for photocatalytic hydrogen (H-2) production0 aTiO2 modification by gold Au for photocatalytic hydrogen H2 prod aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcMAY a1366-13750 v583 a

TiO2 is indeed one of the widely used semiconductors employed for photocatalytic hydrogen production. Most of its photocatalytic activity-is achieved in its crystalline form. However, its photocatalytic activity is limited to ultraviolet region. For making TiO2 visible light active; Au deposition is strongly recommended due to its surface plasmon feature. Au deposition enhances the photocatalytic activity of both crystalline and nanocrystalline TiO2. Efficiency of photocatalytic activity is controlled by shape and size of Au nanoparticle subsequently the synthetic methodology plays an important role. Herein, we furnish a brief description of TiO2-Au nanocomposite synthesis by different methods viz. sol-gel, photodeposition, deposition-precipitation simple reducing method and dispersion method. A discussion on physical properties of the resultant material is also provided. Three different types of mechanism has been described depending on the type of irradiation and form of TiO2 (crystalline and nanocrytalline). A comparative hydrogen production yield is also tabulated to get an idea about the best synthesis methodology and form of TiO2 for efficient photocatalysis. (C) 2016 Elsevier Ltd. All rights reserved.

10aGold nanoparticle10aHydrogen generation10aNanocomposite10aPhotocatalysis10aTiO21 aGupta, Bhavana1 aMelvin, Ambrose, A.1 aMatthews, Tom1 aDash, Sitaram1 aTyagi, A., K. uhttps://library.ncl.res.in/content/tio2-modification-gold-au-photocatalytic-hydrogen-h-2-production-002414nas a2200337 4500008004100000022001400041245008500055210006900140260000800209300001400217490000700231520136300238653002701601653001401628653001501642653001301657653002401670653001801694653002401712653001901736653003401755653002001789653002701809653000901836653003301845653003001878653001001908100001901918700002401937856011501961 2017 eng d a1364-032100aTiO2/RGO composites: Its achievement and factors involved in hydrogen production0 aTiO2RGO composites Its achievement and factors involved in hydro cSEP a1384-13920 v763 a

The immense potential shown by TiO2 to participate as a designer material resulting into a new class of high performing photocatalyst has acclaimed it to become an important player in the designing and synthesis of various solar harvesting materials. This role has further been explored by the introduction of graphene into TiO2 matrix. TiO2/reduced graphene oxide (TiO2/RGO) or TiO2/graphene (TiO2/GR) has shown its prospects or relevance to be considered as the next generation photocatalyst for hydrogen production by its reported values in terms of producing hydrogen gas. Hence, there is a requirement of having a detailed up to date write up on the work done in this area in terms of its synthetic procedures, properties and its effect on hydrogen production. Herein, we discuss the different methods involved in the synthesis of such highly efficient materials followed by a brief explanation on its structural and morphological properties. Furthermore, a comparative study on the recent developments in terms of hydrogen evolution efficiency along with a mechanistic approach is also described. Finally, the current challenge and possibility of the future development in this direction is emphasized.

10aAu-tio2 Photocatalysts10aEvolution10aGeneration10agraphene10aHydrogen generation10aNanocomposite10aNitrogen-doped Tio210aPhotocatalysis10aPhotocatalytic H-2 Production10aRecent Progress10aReduced graphene oxide10aTiO210aTio2-graphene Nanocomposites10aVisible-light Irradiation10aWater1 aGupta, Bhavana1 aMelvin, Ambrose, A. uhttps://library.ncl.res.in/content/tio2rgo-composites-its-achievement-and-factors-involved-hydrogen-production