Enhancement of Photocatalytic Water Oxidation Activity on IrOx-ZnO/Zn2-xGeO4-x-3yN2y Catalyst with the Solid Solution Phase Junction
Enhancement of Photocatalytic Water Oxidation Activity on IrOx-ZnO/Zn2-xGeO4-x-3yN2y Catalyst with the Solid Solution Phase Junction
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DOI：
10.1021/jp103722j
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发表时间：
2010-07
影响因子：
3.7
通讯作者：
B. Ma;Jinhui Yang;Hongxian Han;Jian-tao Wang;Xiaohong Zhang;Can Li
中科院分区：
文献类型：
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作者：
B. Ma;Jinhui Yang;Hongxian Han;Jian-tao Wang;Xiaohong Zhang;Can Li
设计了一种三组分光催化剂IrOx−ZOZ/−xGeO4−x−3yN2y，并对其在可见光照射下光催化制氧进行了研究。结果表明，单独负载IrOx或氧化锌可以有效地提高光催化活性。在−_2·−_xGeO_4·−_3yN_2y催化剂上，IrO_x和−_2O_4的光催化活性更高，约为单独锌_2_xGeO_4−_x_−_3yN_2y催化剂的5.6倍。在−_xGeO_4、−_x、−_3yN_2y催化剂上同时包覆IrOx和氧化锌的光催化剂比依次包覆IrOx和氧化锌的光催化剂具有更高的光催化活性。高分辨电子显微镜表征表明，−/3yN2y纳米粒子之间可能形成了固溶体相结。氧化锌和−_xGeO_4、−_x、−_3yN_2y之间形成的这种相结可以促进电荷分离，从而提高光催化活性。
A three-component photocatalyst IrOx−ZnO/Zn2−xGeO4−x−3yN2y was designed and investigated for photocatalytic O2 production under visible light irradiation. It was found that loading of IrOx or ZnO alone could efficiently improve the photocatalytic activity. The even higher photocatalytic activity was achieved by coloading of IrOx and ZnO on Zn2−xGeO4−x−3yN2y, which was about 5.6 times that of Zn2−xGeO4−x−3yN2y alone. The photocatalysts simultaneously coloaded with IrOx and ZnO on Zn2−xGeO4−x−3yN2y showed higher photocatalytic activities than those coloaded with IrOx and ZnO sequentially. The high resolution transmission electron microscopy (HRTEM) characterization showed that a solid solution phase junction (SSPJ) was possibly formed at the interface of ZnO and Zn2−xGeO4−x−3yN2y nanaoparticles. This phase junction formed between ZnO and Zn2−xGeO4−x−3yN2y may promote the charge separation and consequently result in the enhanced photocatalytic activity.