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| 时间分辨红外光谱研究Cr价态在La,Cr共掺杂SrTiO3光催化剂中的作用 | |
| 引用本文： | 沈帅,贾玉帅,范峰滔,冯兆池,李灿.时间分辨红外光谱研究Cr价态在La,Cr共掺杂SrTiO3光催化剂中的作用[J].催化学报,2013,34(11):2036-2040. |
| 作者姓名： | 沈帅 贾玉帅 范峰滔 冯兆池 李灿 |
| 作者单位： | a 中国科学院大连化学物理研究所催化基础国家重点实验室, 洁净能源国家实验室, 辽宁大连116023; b 中国科学院大学, 北京100049 |
| 基金项目： | supported by the National Natural Science Foundation of China (21090341, 21173213);the National Basic Research Program of China (973 Program, 2009CB220010, 2009CB623507)~~ |
| 摘 要： | 使用时间分辨红外光谱研究了经H2和O2处理的La和Cr共掺杂SrTiO3的光生电子动力学. X射线光电子能谱和Raman光谱结果表明, H2处理后样品中的Cr均是+3价, 而O2处理后Cr为+3和+6价. 使用355和532 nmm激光激发样品所得时间分辨红外光谱表明, 相比在Cr6+存在时, 光生电子衰减速率在Cr3+存在的情况下要慢, 这说明Cr3+更有利于抑制光生电子空穴的复合, 从而增加光催化产氢的活性. |
| 关 键 词： | 时间分辨光谱 铬掺杂 钛酸锶 光催化 |
| 收稿时间： | 2013-07-07 |
Time-resolved infrared spectroscopic investigation of roles of valence states of Cr in (La,Cr)-doped SrTiO3 photocatalysts |
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| Shuai Shen;Yushuai Jia;Fengtao Fan;Zhaochi Feng;Can Li.Time-resolved infrared spectroscopic investigation of roles of valence states of Cr in (La,Cr)-doped SrTiO3 photocatalysts[J].Chinese Journal of Catalysis,2013,34(11):2036-2040. | |
| Authors: | Shuai Shen;Yushuai Jia;Fengtao Fan;Zhaochi Feng;Can Li |
| Institution: | a State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Dalian 116023, Liaoning, China; b University of Chinese Academy of Sciences, Beijing 100049, China |
| Abstract: | The kinetics of photogenerated electrons in SrTiO3(La,Cr) pretreated with either H2 or O2 were studied using time-resolved infrared spectroscopy. The X-ray photoelectron and Raman spectra showed that the Cr cations in the sample reduced with H2 were all in Cr3+, whereas those oxidized with O2 were in mixed of Cr3+ and Cr6+. Electrons excited with 355 and 532 nm light pulses showed the absorption of mid-IR light, and this was traced as a function of the time delay in a microsecond domain. The time-resolved results revealed that the decay rate of the photoinduced electrons with Cr3+ was slower than that with Cr6+, implying that trivalent Cr contributed more to retarding recombination of photoinduced electrons and holes, and enhanced photocatalytic H2 production activity. |
| Keywords: | Time-resolved spectroscopy Chromium doping Strontium titanate Photocatalysis |
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