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题名: Achieving overall water splitting using titanium dioxide-based photocatalysts of different phases
作者: Li, Rengui1;  Weng, Yuxiang2;  Zhou, Xin1;  Wang, Xiuli1;  Mi, Yang2, 3;  Chong, Ruifeng1, 3;  Han, Hongxian1;  Li, Can1
刊名: ENERGY & ENVIRONMENTAL SCIENCE
发表日期: 2015
DOI: 10.1039/c5ee01398d
卷: 8, 期:8, 页:2377-2382
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology ;  Life Sciences & Biomedicine
类目[WOS]: Chemistry, Multidisciplinary ;  Energy & Fuels ;  Engineering, Chemical ;  Environmental Sciences
研究领域[WOS]: Chemistry ;  Energy & Fuels ;  Engineering ;  Environmental Sciences & Ecology
英文摘要: Titanium dioxide (TiO2) is regarded as the benchmark semiconductor in photocatalysis, which possesses a suitable band structure andmakes the overall water splitting reaction thermodynamically possible. However, photocatalytic overall water splitting (POWS) (2H(2)O -> 2H(2) + O-2) can only take place on rutile but hardly on anatase and brookite TiO2. So obtaining the POWS on TiO2-based photocatalysts has remained a long-standing challenge for over 40 years. In this work, we found that the POWS on anatase and brookite TiO2 becomes feasible under prolonged UV light irradiation. Further investigation by means of electron spin resonance spectroscopy (EPR) and transient infrared absorption-excitation energy scanning spectroscopy (TRIRA-ESS) reveals that both kinetics and thermodynamics factors contributed to unique POWS activity for different phases of TiO2. Kinetically the process of photocatalysis differs on different phases of TiO2 due to the intermediates (center dot OH radical for anatase and brookite TiO2, peroxy species for rutile TiO2) that are formed. Thermodynamically there are many trapped states lying near the valence band of anatase and brookite but not for rutile TiO2, which reduce the overpotential for water oxidation. These findings develop our understanding of why some semiconductors are inactive as POWS photocatalysts despite having thermodynamically suitable band structures for the proton reduction and water oxidation reactions.
关键词[WOS]: TIO2 AQUEOUS SUSPENSIONS ;  VISIBLE-LIGHT-DRIVEN ;  IN-SITU FTIR ;  SURFACE-STATES ;  HYDROGEN ;  EPR ;  PHOTOLUMINESCENCE ;  PHOTOOXIDATION ;  ABSORPTION ;  MECHANISMS
语种: 英语
WOS记录号: WOS:000358730600014
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/146413
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Inst Phys, Key Lab Softmatter Phys, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Recommended Citation:
Li, Rengui,Weng, Yuxiang,Zhou, Xin,et al. Achieving overall water splitting using titanium dioxide-based photocatalysts of different phases[J]. ENERGY & ENVIRONMENTAL SCIENCE,2015,8(8):2377-2382.
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