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

Time-resolved infrared spectroscopic investigation of roles of valence states of Cr in (La,Cr)-doped SrTiO3 photocatalysts
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时间分辨红外光谱研究 Cr 价态在 (La,Cr) 掺杂 SrTiO3 光催化剂中的作用

DOI:
10.1016/s1872-2067(12)60702-5
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发表时间:
2013-11
影响因子:
16.5
通讯作者:
Li Can
Li Can
中科院分区:
化学1区
文献类型:
--
作者:
Shen Shuai;Jia Yushuai;Fan Fengtao;Feng Zhaochi;Li Can

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使用时间分辨红外光谱研究了经 H2 或 O2 预处理的 SrTiO3(La,Cr) 中的光生电子动力学。 X射线光电子和拉曼光谱表明,样品中被H2还原的Cr阳离子均为Cr3+,而被O2氧化的Cr阳离子则为Cr3+和Cr6+的混合形式。用 355 和 532 nm 光脉冲激发的电子显示出中红外光的吸收,并将其追踪为微秒域内时间延迟的函数。时间分辨结果表明,Cr3+光生电子的衰减速率比Cr6+慢,这意味着三价Cr对延迟光生电子和空穴的复合贡献更大,并增强光催化产氢活性。
The kinetics of photogenerated electrons in SrTiO3(La,Cr) pretreated with either H2or O2were studied using time-resolved infrared spectroscopy. The X-ray photoelectron and Raman spectra showed that the Cr cations in the sample reduced with H2were all in Cr3+, whereas those oxidized with O2were 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 H2production activity.
DOI: 10.1021/la049590v
发表时间: 2004-07
期刊: Langmuir : the ACS journal of surfaces and colloids
影响因子: --
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