Photocatalytic O2 evolution of rhodium and antimony-codoped rutile-type TiO2 under visible light irradiation
Photocatalytic O2 evolution of rhodium and antimony-codoped rutile-type TiO2 under visible light irradiation
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DOI：
10.1021/jp074707k
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发表时间：
2007-11-22
影响因子：
3.7
通讯作者：
Kudo, Akihiko
中科院分区：
文献类型：
--
作者：
Niishiro, Ryo;Konta, Ryoko;Kudo, Akihiko
研究了铑和锑共掺杂对金红石型TiO 2光催化性能和物理性能的影响。铑锑共掺杂的TiO 2（TiO 2：Rh/Sb）在可见光区具有吸收带。其能隙为2.1eV。在可见光照射下（λ> 440 nm），以Ag+离子为电子受体，TiO 2：Rh/Sb粉末表现出光催化氧化水生成O-2的活性，而仅掺杂铑的TiO 2没有表现出光催化活性。光催化活性强烈依赖于Sb/Rh掺杂剂的量和比例。电子自旋共振，漫反射光谱，和X射线吸收近边结构分析表明，掺杂的铑存在于活性光催化剂中的三价氧化态。少量的Rh ~（4+）离子使光催化活性显著降低。Sb通过电荷补偿抑制Rh ~（4+）的形成。因此，它已被澄清，Rh 3+是负责在可见光照射下的TiO 2：Rh/Sb光催化剂的光催化活性的物种。
The effects upon the photophysical and photocatalytic properties of the codoping of rhodium and antimony in rutile-type TiO2 were investigated. TiO2 codoped with rhodium and antimony (TiO2:Rh/Sb) had an absorption band in the visible light region. Its energy gap was 2.1 eV. The TiO2:Rh/Sb powder showed photocatalytic activity for the oxidation of water to form O-2 in the presence of Ag+ ions as an electron acceptor under visible light irradiation (lambda > 440 nm), whereas TiO2 doped with only rhodium showed no activity. The photocatalytic activity strongly depended on the amount and ratio of the Sb/Rh dopant. Electron spin resonance, diffuse reflection spectroscopy, and X-ray absorption near-edge structure analyses revealed that the doped rhodium exists in a trivalent oxidation state in the active photocatalyst. The photocatalytic activity was decreased remarkably even by a small amount of Rh4+ ions. Antimony played an important role in suppressing the formation of Rh4+ ions by charge compensation. Thus, it has been clarified that Rh3+ is the species responsible for the photocatalytic activity under visible light irradiation in the TiO2:Rh/Sb photocatalyst.