Visible-light-driven photocatalysis via reductant-to-band charge transfer in Cr(III) nanocluster-loaded SrTiO3 system
Visible-light-driven photocatalysis via reductant-to-band charge transfer in Cr(III) nanocluster-loaded SrTiO3 system
复制标题
DOI：
10.1016/j.apcatb.2020.118883
复制
发表时间：
2020-08
影响因子：
22.1
通讯作者：
Aufandra Cakra Wardhana;A. Yamaguchi;S. Shoji;Min Liu;T. Fujita;T. Hitosugi;M. Miyauchi
中科院分区：
文献类型：
--
作者：
Aufandra Cakra Wardhana;A. Yamaguchi;S. Shoji;Min Liu;T. Fujita;T. Hitosugi;M. Miyauchi
设计高效的可见光活性光催化剂具有重要的实用价值。在此，钛酸锶（SrTiO 3），一个宽带隙半导体，载有铬（III）纳米团簇已被证明是一种可见光活性的光催化剂驱动的还原带电荷转移（RBCT）机制。作用光谱表明，在430 nm附近的吸收贡献相当大的光催化分解2-丙醇。采用电子自旋共振（ESR）、电化学和光电化学技术研究了Cr（III）负载SrTiO 3体系的反应机理。我们证实了界面电子转移（即，RBCT）从Cr（III）纳米团簇到SrTiO 3导带引发了可见光照射下的光催化反应。此外，在这个系统中，Cr（III）纳米团簇作为一个有效的氧化反应的催化位点。RBCT机制为其他有效的宽带隙半导体在可见光照射下具有活性开辟了新的机会，并有望适用于更广泛的应用。
Designing efficient visible-light-active photocatalysts is important for practical uses. Herein, strontium titanate (SrTiO3), a wide-bandgap semiconductor, loaded with chromium (III) nanoclusters has been demonstrated as a visible-light-active photocatalyst driven by the reductant-to-band charge transfer (RBCT) mechanism. The action spectrum revealed that absorption at around 430 nm contributed considerably to the photocatalytic 2-propanol decomposition. The reaction mechanism in the Cr(III)-loaded SrTiO3system was studied by electron spin resonance (ESR) spectroscopy, electrochemical, and photoelectrochemical technique. We confirmed that the interfacial electron transfer (i.e.,RBCT) from Cr(III) nanoclusters to the conduction band of SrTiO3initiated the photocatalytic reaction under visible-light irradiation. In this system, moreover, the Cr(III) nanoclusters acted as a catalytic site for the efficient oxidation reaction. The RBCT mechanism opens new opportunities for other efficient wide-bandgap semiconductors to be active under visible-light irradiation and is expected to be applicable for a wider range of applications.