A red metallic oxide photocatalyst
A red metallic oxide photocatalyst
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DOI：
10.1038/nmat3312
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发表时间：
2012-07-01
期刊：
影响因子：
41.2
通讯作者：
Irvine, John T. S.
中科院分区：
文献类型：
--
作者：
Xu, Xiaoxiang;Randorn, Chamnan;Irvine, John T. S.
半导体中跨带隙的光吸收在许多重要应用中被利用，诸如光致发光器件、发光二极管和光催化转换。金属与半导体的不同之处在于，没有能隙将占据和未占据的能级分开;然而，仍然可以在能带之间激发电子。具有金属特性的材料也具有强烈的颜色。一个重要的问题是，这种有色金属是否可以用于集光或类似的应用。金属的高导电性将排除可用于分离光载流子的足够电场;然而，金属中的高载流子迁移率也可能促进动力学电荷分离。在这里，我们清楚地证明了第一次使用的红色金属氧化物，Sr 1-xNbO 3作为一种有效的光催化剂。该材料已被用于在可见光下光催化亚甲基蓝的氧化和适当的牺牲元素辅助下的水的氧化和还原。
Light absorption across the bandgap in semiconductors is exploited in many important applications such as photovoltaics, light emitting diodes and photocatalytic conversion. Metals differ from semiconductors in that there is no energy gap separating occupied and unoccupied levels; however, it is still possible to excite electrons between bands. This is evidenced by materials with metallic properties that are also strongly coloured. An important question is whether such coloured metals could be used in light harvesting or similar applications. The high conductivity of a metal would preclude sufficient electric field being available to separate photocarriers; however, the high carrier mobility in a metal might also facilitate kinetic charge separation. Here we clearly demonstrate for the first time the use of a red metallic oxide, Sr1-xNbO3 as an effective photocatalyst. The material has been used under visible light to photocatalyse the oxidation of methylene blue and both the oxidation and reduction of water assisted by appropriate sacrificial elements.