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

doi:10.1016/S1872-2067(12)60702-5

催化学报 ›› 2013, Vol. 34 ›› Issue (11): 2036-2040.DOI: 10.1016/S1872-2067(12)60702-5

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

沈帅^a,b, 贾玉帅^a,b, 范峰滔^a, 冯兆池^a, 李灿^a

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

收稿日期:2013-07-07 修回日期:2013-09-03 出版日期:2013-10-18 发布日期:2013-10-18
通讯作者: Zhaochi Feng,Can Li
基金资助:
国家自然科学基金(21090341,21173213);国家重点基础研究发展计划(973计划,2009CB220010,2009CB623507).

Time-resolved infrared spectroscopic investigation of roles of valence states of Cr in (La, Cr)-doped SrTiO₃ photocatalysts

Shuai Shen^a,b, Yushuai Jia^a,b, Fengtao Fan^a, Zhaochi Feng^a, Can Li^a

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

Received:2013-07-07 Revised:2013-09-03 Online:2013-10-18 Published:2013-10-18
Contact: Zhaochi Feng,Can Li
Supported by:
This work was financially supported by the National Natural Science Foundation of China (21090341, 21173213) and the National Basic Research Program of China (973 Program, 2009CB220010, 2009CB623507).

摘要/Abstract

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

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.

Key words: Time-resolved spectroscopy, Chromium doping, Strontium titanate, Photocatalysis

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.

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.

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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

Time-resolved infrared spectroscopic investigation of roles of valence states of Cr in (La, Cr)-doped SrTiO₃ photocatalysts

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