02481nas a2200265   4500008004100000022001400041245010400055210006900159260010600228300001400334490000700348520153200355653002101887653001901908653001901927653002701946653000901973100001901982700002402001700001802025700001402043700001802057700001802075856012202093       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<p>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.</p>10agamma-radiolysis10aH-2 production10aPhotocatalysis10aReduced graphene oxide10aTiO21 aGupta, Bhavana1 aMelvin, Ambrose, A.1 aMatthews, Tom1 aDhara, S.1 aDash, Sitaram1 aTyagi, A., K.  uhttp://library.ncl.res.in/content/facile-gamma-radiolytic-methodology-tio2-rgo-synthesis-effect-photo-catalytic-h-2-002118nas a2200253   4500008004100000022001400041245008000055210006900135260010600204300001400310490000700324520123900331653002201570653002401592653001801616653001901634653000901653100001901662700002401681700001801705700001801723700001801741856010501759       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<p>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.</p>10aGold nanoparticle10aHydrogen generation10aNanocomposite10aPhotocatalysis10aTiO21 aGupta, Bhavana1 aMelvin, Ambrose, A.1 aMatthews, Tom1 aDash, Sitaram1 aTyagi, A., K.  uhttp://library.ncl.res.in/content/tio2-modification-gold-au-photocatalytic-hydrogen-h-2-production-002431nas a2200265   4500008004100000245014900041210006900190260000800259300000900267490000800276520151200284653002801796653002401824653001401848653001901862653002201881653002201903100002001925700001701945700001701962700001601979700003001995700001802025856012202043       2017                        eng d00aBand alignment and charge transfer pathway in three phase anatase-rutile-brookite TiO2 nanotubes: an efficient photocatalyst for water splitting0 aBand alignment and charge transfer pathway in three phase anatas  cDEC  a9-190 v1283 aThe study reports electrochemical synthesis, phase evolution and hydrogen generation efficiency of anatase, anatase-rutile and anatase-rutile-brookite (ARB) TiO2 nanotubes for the first time. The SEM and TEM micrographs confirm the tubular morphology of the samples. The presence of anatase, rutile and brookite phases in a single nanotube is confirmed from high resolution TEM analysis. The water splitting efficiency of the three systems are studied under one sun illumination. It is observed that the anatase-rutile-brookite TiO2 nanotubes are highly efficient compared to anatase-rutile or anatase TiO2 nanotubes. The hydrogen generated by ARB composites, after four hours of one sun illumination, is found to be nearly twice that of anatase TiO2 nanotubes and 1.6 times that of anatase-rutile TiO2 nanotubes. The results suggest that the ARB in single nanotube having two junction interfaces, highly facilitate interparticle charge transfer compared to single junction anatase-rutile or bare anatase TiO2 nanotubes. From the deconvolution of PL spectra and the synchrotron radiation assisted valence band edge analysis, the band diagram for the anatase-rutile-brookite phase is constructed. The charge separation and its transfer pathway for efficient photo-assisted water splitting are delineated. This opens a new route for the simple synthesis and study of tri-phase TiO2 for efficient photocatalytic water splitting compared to the widely studied two phase TiO2. (C) 2017 Published by Elsevier B.V.10aAnatase-Rutile-Brookite10aHydrogen generation10ananotubes10aPhotocatalysis10aphotoluminescence10aValence band edge1 aPreethi, L., K.1 aMathews, Tom1 aNand, Mangla1 aJha, S., N.1 aChinnakonda, Gopinath, S.1 aDash, Sitaram  uhttp://library.ncl.res.in/content/band-alignment-and-charge-transfer-pathway-three-phase-anatase-rutile-brookite-tio2