Optimizing the performance of photocatalytic H(2) generation for ZnNb(2)O(6) synthesized by a two-step hydrothermal method.
Optimizing the performance of photocatalytic H(2) generation for ZnNb(2)O(6) synthesized by a two-step hydrothermal method.
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优化两步水热法合成 ZnNb2O6 光催化产氢性能
DOI：
10.1039/c8ra01624k
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发表时间：
2018-04-11
期刊：
影响因子：
3.9
通讯作者：
Yang, Tao
中科院分区：
文献类型：
--
作者：
Chun, Yutong;Yue, Mufei;Jiang, Pengfei;Chen, Shijian;Gao, Wenliang;Cong, Rihong;Yang, Tao
Semiconductor-based photocatalytic H2 generation is a promising technique and the development of efficient photocatalysts has attracted great attention. Columbite-ZnNb2O6 is a wide-bandgap semiconductor capable of photocatalytic water splitting. Here we employed a two-step hydrothermal method to first dissolve Nb2O5 with a highly basic aqueous solution and further react it with Zn2+ to form nanosized ZnNb2O6. The reaction time plays an important role on its morphology and photocatalytic performance in water reduction. The sample synthesized through 7 days of reaction was the optimal one with an appropriate crystallinity and a large specific surface area, however the severe surficial defects prohibited its photocatalytic activity in pure water. The H2 generation at a rate of 23.6(5) μmol h−1 g−1 emerged when 20 vol% methanol was used as the hole-sacrificial agent. Most remarkably, once metal or metal oxide cocatalysts, including Pt, Au, NiO, RuO2, Ag2O, and Pd/PdO, were loaded appropriately, the photocatalytic H2 generation rate ultimately achieved 3200(100) or 680(20) μmol h−1 g−1 with or without using methanol, respectively. Apparent quantum yields (AQYs) at 295 nm were investigated by changing the experimental parameters, and the optimal AQYs are 4.54% and 9.25% in water and methanol solution, respectively. Further post-modifications like bandgap engineering may be performed on this highly efficient nano-ZnNb2O6. Nanosized ZnNb2O6 synthesized hydrothermally is highly efficient and stable in photocatalytic water reduction with an optimal AQY of 9.25%.
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影响因子：
15.1
作者：
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通讯作者：
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影响因子：
4.9
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影响因子：
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