Photocatalytic H2 generation from spinels ZnFe2O4, ZnFeGaO4 and ZnGa2O4
Photocatalytic H2 generation from spinels ZnFe2O4, ZnFeGaO4 and ZnGa2O4
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DOI：
10.1016/j.cattod.2012.03.013
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发表时间：
2013
期刊：
影响因子：
5.3
通讯作者：
Xiaoxiang Xu;A. Azad;J. Irvine
中科院分区：
文献类型：
--
作者：
Xiaoxiang Xu;A. Azad;J. Irvine
采用常规固相反应法合成了ZnFe2O4、ZnFeGaO4和ZnGa2O4三种尖晶石。 ZnFeGaO4 的晶胞参数介于母体尖晶石之间，在可见光范围内表现出明显的吸收，带隙约为 1.9eV。光催化实验表明，ZnFeGaO4在可见光照射（λ≥420nm）下具有合理的产氢速率（∼9μmolh−1/g催化剂），但与母体ZnFe2O4化合物（产氢速率∼861μmolh−1/g催化剂）相比，表现出改进的性能（产氢速率∼971μmolh−1/g催化剂） 催化剂）在全范围照射（λ≥250nm）下。通过将尖晶石粉末电泳沉积到掺氟氧化锡玻璃上制备的光电极在照射下表现出清晰的阻抗响应。将Ga引入到ZnFe2O4结构中似乎增强了紫外区域的光吸收并改变了电子结构，从而提高了光催化活性。
The three spinels ZnFe2O4, ZnFeGaO4and ZnGa2O4were synthesised by conventional solid state reaction method. ZnFeGaO4has unit cell parameter between the parent spinels and shows appreciable absorption in visible light range with a band gap ∼1.9eV. Photocatalytic experiments show that ZnFeGaO4has a reasonable hydrogen production rate (∼9μmolh−1/g catalyst) under visible light irradiation (λ≥420nm) but exhibits an improved performance (hydrogen production rate ∼971μmolh−1/g catalyst) compared with parent ZnFe2O4compound (hydrogen production rate ∼861μmolh−1/g catalyst) under full range irradiation (λ≥250nm). The photo-electrodes prepared by electrophoretic deposition of spinel powders onto the fluorine doped tin oxide glass showed a clear impedance response under irradiation. Introducing Ga into the ZnFe2O4structure seems to enhance the light absorbance in the UV region and modify the electronic structure which accounts for the improved photocatalytic activity.