Visible-light-response and photocatalytic activities of TiO2 and SrTiO3 photocatalysts codoped with antimony and chromium
Visible-light-response and photocatalytic activities of TiO2 and SrTiO3 photocatalysts codoped with antimony and chromium
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DOI：
10.1021/jp0255482
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发表时间：
2002-05-16
影响因子：
3.3
通讯作者：
Kudo, A
中科院分区：
文献类型：
--
作者：
Kato, H;Kudo, A
二氧化钛和SrTiO 3共掺杂锑和铬显示出强烈的吸收带在可见光区，并具有2.2和2.4 eV的能隙，分别。在可见光照射下，锑和铬共掺杂的TiO 2从硝酸银水溶液中放出O-2，而锑和铬共掺杂的SrTiO 3从甲醇水溶液中放出H-2。锑铬共掺杂的TiO 2光催化剂的活性明显高于单纯铬掺杂的TiO 2。这是由于Sb ~（5+）和Cr ~（3+）离子的共掺杂保持了电荷平衡，抑制了Cr ~（6+）离子的形成和晶格中的氧缺陷，使其成为光生电子和空穴之间有效的非辐射复合中心。
TiO2 and SrTiO3 codoped with antimony and chromium showed intense absorption bands in the visible light region and possessed 2.2 and 2.4 eV of energy gaps, respectively. TiO2 codoped with antimony and chromium evolved O-2 from an aqueous silver nitrate solution under visible light irradiation, while SrTiO3 codoped with antimony and chromium evolved H-2 from an aqueous methanol solution. The activity of TiO2 photocatalyst codoped with antimony and chromium was remarkably higher than that of TiO2 doped with only chromium. It was due to that the charge balance was kept by codoping of Sb5+ and Cr3+ ions, resulting in the suppression of formation of Cr6+ ions and oxygen defects in the lattice which should work as effectively nonradiative recombination centers between photogenerated electrons and holes.