Author
A.R. Shirole
Bio: A.R. Shirole is an academic researcher from Bhabha Atomic Research Centre. The author has contributed to research in topics: Photocatalysis & Band gap. The author has an hindex of 5, co-authored 5 publications receiving 353 citations.
Topics: Photocatalysis, Band gap, Anatase, Cadmium sulfide, Mixed oxide
Papers
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TL;DR: In this paper, a polyol-based synthesis of mixed oxide nanoparticles for hydrogen generation from water using methanol as sacrificial reagent was studied under sunlight type radiation and the results indicate that mixed oxides have better activity compared to pure TiO 2 synthesized by the same method and the activity decreases with increasing SnO 2 concentration in TiO2.
154 citations
TL;DR: In this paper, the photocatalytic activity of indium and nitrogen co-doped TiO 2 was investigated for hydrogen generation from water using X-ray photoelectron spectra.
Abstract: Indium and nitrogen co-doped TiO 2 , indium- or nitrogen-doped TiO 2 and undoped TiO 2 were synthesized by polyol method and studied their photocatalytic activity for hydrogen generation from water. Crystalline nanoparticles of predominantly anatase phase of TiO 2 were obtained by this method. A clear red shift of the absorption edge and stronger absorption in the visible region was observed for indium and nitrogen co-doped TiO 2 compared to the other samples. The presence of bonded nitrogen in the N-doped samples was evidenced from their N 1s X-ray photoelectron spectra. Photocatalytic activity for hydrogen generation using sunlight type radiation showed enhanced activity for the doped samples compared to pristine TiO 2 . The photocatalytic activity of different samples decreased in the following order: N and In co-doped TiO 2 > In-doped TiO 2 > N-doped TiO 2 > undoped TiO 2 . The enhanced photocatalytic activity of the In and N co-doped TiO 2 for hydrogen generation is attributed to the enhanced light absorption resulting from the narrowing of the band gap caused by the contribution of 5s5p orbitals of In to the conduction band and 2p orbitals of N to the valence band of TiO 2 . A pronounced enhancement of photocatalytic activity was observed for all catalysts when Pd metal was present as co-catalyst due to the efficient separation of photogenerated charge carriers in this nanocomposite system.
88 citations
TL;DR: In this paper, a composite photocatalyst of indium doped cadmium sulfide dispersed on zirconium oxide has been synthesized, which shows enhanced photocatalytic activity for hydrogen generation from water.
Abstract: A novel composite photocatalyst of indium doped cadmium sulfide dispersed on zirconium oxide has been synthesized, which shows enhanced photocatalytic activity for hydrogen generation from water. In this system, cadmium sulfide exists as a separate dispersed phase on the zirconia support. Optical absorption spectra indicate a blue shift of absorption edge for CdS and In doped CdS dispersed on ZrO2 compared to pure CdS and indium doped CdS. Among the supported CdS, In doped CdS exhibits better optical absorption property. Photocatalytic studies for hydrogen generation from water show an enhanced activity for CdS dispersed on ZrO2 and indium doping in CdS enhances the activity further. Fluorescence lifetime studies indicate that, in the supported CdS, the charge carriers have higher lifetime than that in the unsupported CdS. Photocurrent response experiments show a relatively higher current output for the In doped CdS dispersed on ZrO2 support. The enhanced photocatalytic activity of this composite sample is attributed to a combination of factors like enhanced lifetime of the photogenerated charge carriers, increased photoresponse and improved surface area. The present study leads to a new observation that the photocurrent response and photocatalytic activity of CdS and indium doped CdS are enhanced when they are dispersed on a support like ZrO2. These composites with Pd as co-catalyst exhibit a large increase in the photocatalytic activity due to the increased availability of electrons on the metal surface by the interfacial transfer of electrons from CdS to Pd, when irradiated.
50 citations
TL;DR: In this paper, the authors demonstrate an enhanced photocatalytic activity for TiO2 when it is dispersed on ZrO2 and zeolite compared to that dispersed on Al2O3 and CeO2.
Abstract: We demonstrate an enhanced photocatalytic activity for TiO2 when it is dispersed on ZrO2 and zeolite compared to that dispersed on Al2O3 and CeO2. In these composite systems, TiO2 exists as a dispersed particulate phase and the extent of dispersion is the highest on ZrO2 support. Na–Y zeolite possesses the maximum Lewis acidity followed by ZrO2, Al2O3 and CeO2. Optical absorption property of TiO2 dispersed on ZrO2, zeolite and CeO2 is better than that of unsupported TiO2. In the above mentioned systems, photocatalytic activity of TiO2 shows a strong dependence on the surface acidity of the support. A significantly high photocatalytic activity for hydrogen generation from water–methanol mixture is observed for the TiO2–ZrO2 system. The enhanced activity of TiO2 dispersed on ZrO2 is attributed to the enhanced optical absorption and increased life time of the photogenerated charge carriers assisted by the surface acidic sites. Present study leads to a new result that a highly dispersed phase of TiO2 on a support having higher surface acidity exhibits enhanced photocatalytic activity. This strategy may be useful for the design of new catalysts yielding high photocatalytic activity. Presence of a co-catalyst like Pd metal enhances the photocatalytic activity further.
49 citations
TL;DR: The enhanced photocatalytic activity of the composite is attributed to the decreased particle size of CdS and increased lifetime of the charge carriers resulting from the efficient interfacial transfer of photogenerated electrons at the CdCdS/TiO2 and C dS/ZrO2 interface.
34 citations
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TL;DR: Approaches to Modifying the Electronic Band Structure for Visible-Light Harvesting and its Applications d0 Metal Oxide Photocatalysts 6518 4.4.1.
Abstract: 2.3. Evaluation of Photocatalytic Water Splitting 6507 2.3.1. Photocatalytic Activity 6507 2.3.2. Photocatalytic Stability 6507 3. UV-Active Photocatalysts for Water Splitting 6507 3.1. d0 Metal Oxide Photocatalyts 6507 3.1.1. Ti-, Zr-Based Oxides 6507 3.1.2. Nb-, Ta-Based Oxides 6514 3.1.3. W-, Mo-Based Oxides 6517 3.1.4. Other d0 Metal Oxides 6518 3.2. d10 Metal Oxide Photocatalyts 6518 3.3. f0 Metal Oxide Photocatalysts 6518 3.4. Nonoxide Photocatalysts 6518 4. Approaches to Modifying the Electronic Band Structure for Visible-Light Harvesting 6519
6,332 citations
TL;DR: This paper presents a meta-analyses of the chiral stationary phase transition of Na6(CO3)(SO4)2, Na2SO4, and Na2CO3 of the Na2O/Na2O 2 mixture at the stationary phase and shows clear patterns in the response of these two materials to each other.
Abstract: Jenny Schneider,*,† Masaya Matsuoka,‡ Masato Takeuchi,‡ Jinlong Zhang, Yu Horiuchi,‡ Masakazu Anpo,‡ and Detlef W. Bahnemann*,† †Institut fur Technische Chemie, Leibniz Universitaẗ Hannover, Callinstrasse 3, D-30167 Hannover, Germany ‡Faculty of Engineering, Osaka Prefecture University, 1 Gakuen-cho, Sakai Osaka 599-8531, Japan Key Lab for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Shanghai 200237, China
4,353 citations
TL;DR: UV-Visible ار راد ن .د TiO2 ( تیفرظ راون مان هب نورتکلا یاراد لماش VB و ) رگید اب لاقتنا VB (CO2) .
Abstract: UV-Visible ار راد ن .د TiO2 ( تیفرظ راون مان هب نورتکلا یاراد یژرنا زارت لماش VB و ) رگید زارت ی یژرنا اب ( ییاناسر راون مان هب نورتکلا زا یلاخ و رتلااب VB یم ) .دشاب ت ود نیا نیب یژرنا توافت یژرنا فاکش زار ، پگ دناب هدیمان یم .دوش هک ینامز زا نورتکلا لاقتنا VB هب VB یم ماجنا دریگ ، TiO2 اب ودح یژرنا بذج د ev 2 / 3 ، نورتکلا تفج کی دیلوت یم هرفح .دیامن و نورتکلا هرفح ی نا اب هدش دیلوت یم کرتشم حطس هب لاقت ثعاب دناوت شنکاو ماجنا اه یی ددرگ . TiO2 دربراک ،دراد یدایز یاه هلمج زا یم ناوت اوه یگدولآ هیفصت یارب (CO2) و بآ و ... نآ زا هدافتسا درک .
2,055 citations
TL;DR: Generations Yi Ma,† Xiuli Wang,† Yushuai Jia,† Xiaobo Chen,‡ Hongxian Han,*,† and Can Li*,†
Abstract: Generations Yi Ma,† Xiuli Wang,† Yushuai Jia,† Xiaobo Chen,‡ Hongxian Han,*,† and Can Li*,† †State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences and Dalian National Laboratory for Clean Energy, 457 Zhongshan Road, Dalian 116023, China ‡Department of Chemistry, College of Arts and Sciences, University of Missouri-Kansas City, 5100 Rockhill Road, Kansas City, Missouri 64110, United States
1,990 citations
TL;DR: The UV-vis spectra show that the Ti(3+) here extends the photoresponse of TiO(2) from the UV to the visible light region, which leads to high visible-light photocatalytic activity for the generation of hydrogen gas from water.
Abstract: Through a facile one-step combustion method, partially reduced TiO2 has been synthesized. Electron paramagnetic resonance (EPR) spectra confirm the presence of Ti3+ in the bulk of an as-prepared sample. The UV−vis spectra show that the Ti3+ here extends the photoresponse of TiO2 from the UV to the visible light region, which leads to high visible-light photocatalytic activity for the generation of hydrogen gas from water. It is worth noting that the Ti3+ sites in the sample are highly stable in air or water under irradiation and the photocatalyst can be repeatedly used without degradation in the activity.
1,120 citations