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Police, Anil Kumar Reddy,Chennaiahgari, Manvitha,Boddula, Rajender,Vattikuti, S.V. Prabhakar,Mandari, Kotesh Kumar,Chan, Byon Elsevier 2018 Materials research bulletin Vol.98 No.-
<P><B>Abstract</B></P> <P>Herein, we discuss the synthesis of reduced graphene oxide and TiO<SUB>2</SUB> (rGO-TiO<SUB>2</SUB>) nanocomposites with varying ratios of rGO to TiO<SUB>2</SUB> by hydrothermal method. Photocatalytic ability of the nanocomposites was assessed for H<SUB>2</SUB> production under natural sunlight. At 5wt% GO loading, the rGO-TiO<SUB>2</SUB> exhibited 24,880μmol/g/h H<SUB>2</SUB>, 12.9 times to commercial P25-TiO<SUB>2</SUB> (1920μmol/g/h). The symmetric supercapacitor device fabricated using rGO-TiO<SUB>2</SUB> demonstrated 160F/g specific capacitance with 99% retention. The efficient charge carrier separation and transportation between TiO<SUB>2</SUB> nanotubes and rGO resulted high photocatalytic activity. The synergistic double layer pseudo capacitor behavior of rGO-TiO<SUB>2</SUB> is the reason for improved specific capacitance.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Wrinkle rGO wrapped TiO<SUB>2</SUB> nanotubes were prepared by alkanine hydrothermal method. </LI> <LI> Improved visible absorption and reduced recombination was witnessed in rGO-TiO<SUB>2</SUB>. </LI> <LI> H<SUB>2</SUB> production of 24,880μmole/g/h was achieved by rGO-TiO<SUB>2</SUB>, 12.9 folds to P25 TiO<SUB>2</SUB>. </LI> <LI> Double layer and pseudo capacitance of rGO-TiO<SUB>2</SUB> showed specific capacitance 160F/g. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Reddy, Police Anil Kumar,Manvitha, Chennaiahgari,Reddy, Pullagurala Venkata Laxma,Kim, Ki-Hyun,Kumari, Valluri Durga Elsevier Inc 2017 Journal of Energy Chemistry Vol.26 No.3
<P>A series of titania nanoparticles and nanotubes deposited with various quantities of bismuth (Bi) were prepared via sol-gel and hydrothermal methods, respectively. They were then characterized using X-ray diffraction spectroscopy (XRD), X-ray photo electron spectroscopy (XPS), UV-Vis diffused reflectance spectra (DRS), photoluminescence spectra (PLS), transmission electron microscopy (TEM), energy dispersive analysis of X-rays (EDAX), and BET surface analysis. These catalysts were employed for the photocatalytic production of hydrogen from a mixture of pure water and glycerol under solar light irradiation. The presence of the Bi(3 + x)+ species was found to play a vital role in enhancing activity while minimizing electron hole recombination (relative to bare TiO2). The nanotubes exhibited better activity than the nanoparticles of Bi-deposited TiO2, showing the significance of the morphology; however, photocatalytic activity is predominantly dependent on the deposition of bismuth. The activity increased by approximately an order of magnitude at the optimum concentration of Bi deposited over TiO2 (2 wt%). The presence of the Bi(3 + x)+ species played a vital role in minimizing electron hole recombination, resulting in higher activity compared to bare TiO2. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.</P>
안일쿠마레디,P. Venkata Laxma Reddy,김기현,만다리코테쉬쿠마,Chennaiahgari Manvitha,심재진 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
In order to maximize the photocatalytic production of hydrogen, it is desirable to develop an efficient photocatalyst with enhanced yield and visible sensitivity. To this end, we developed a novel method to synthesize nitrogen doped TiO2 with anatase/rutile/brookite mixed phases in aqueous urea solutions. The hydrogen production capacity of the nitrogen doped multiphase TiO2 (e.g., anatase (69%)/brookite (17%)/rutile (14%)), when assessed under solar light irradiation, was six times higher than that of commercial Degussa P25 and bare TiO2 catalysts. Such enhanced efficiency was ascribed to increased visible absorption along with effective electron–hole separation between the different crystalline phases.
Police, Anil Kumar Reddy,Vattikuti, S.V. Prabhakar,Mandari, Kotesh Kumar,Chennaiahgari, Manvitha,M.V., Phanikrishna Sharma,Valluri, Durga Kumari,Byon, Chan Elsevier 2018 CERAMICS INTERNATIONAL Vol.44 No.10
<P><B>Abstract</B></P> <P>A novel Cu<SUB>2</SUB>O/TiO<SUB>2</SUB>/Bi<SUB>2</SUB>O<SUB>3</SUB> ternary nanocomposite was prepared, in which copper oxide improves the visible light absorption of TiO<SUB>2</SUB> and bismuth oxide improves electron–hole separation. The ternary composite exhibited extended absorption in the visible region, as determined by UV–Vis diffuse reflectance spectroscopy. High-resolution transmission electron microscopy images showed close contact among the individual semiconductor oxides in the ternary Cu<SUB>2</SUB>O/TiO<SUB>2</SUB>/Bi<SUB>2</SUB>O<SUB>3</SUB> nanocomposite. Improved charge carrier separation and transport were observed in the Cu<SUB>2</SUB>O/TiO<SUB>2</SUB>/Bi<SUB>2</SUB>O<SUB>3</SUB> ternary composite using electrochemical impedance spectroscopy and photocurrent analysis. TiO<SUB>2</SUB> modified with bismuth and copper oxides showed exceptional photocatalytic activity for hydrogen production under natural solar light. With optimum bismuth and copper oxide loadings, the Cu<SUB>2</SUB>O/TiO<SUB>2</SUB>/Bi<SUB>2</SUB>O<SUB>3</SUB> ternary nanocomposite exhibited an H<SUB>2</SUB> production (3678 μmol/h) 35 times higher than that of bare TiO<SUB>2</SUB> (105 μmol/h). The synergistic effect of improved visible absorption and minimal recombination was responsible for the enhanced performance of the as-synthesized ternary nanocomposite.</P>