Insight into the Improvement Mechanism of Copper Oxide/BiVO4 Heterojunction Photoanodes for Solar Water Oxidation
Insight into the Improvement Mechanism of Copper Oxide/BiVO4 Heterojunction Photoanodes for Solar Water Oxidation
复制标题
探究氧化铜/BiVO4异质结光阳极太阳能水氧化的改进机制
DOI：
10.1149/2.0611912jes
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发表时间：
2019-07-16
影响因子：
3.9
通讯作者：
Wang, Jun
中科院分区：
文献类型：
--
作者：
Yang, Yuran;Zhong, Xiaohui;Wang, Jun
研究了n型BiVO4膜偶联p型氧化铜纳米粒子作为水氧化的光阳极。与BiVO4膜相比，Cu2O/BiVO4膜、CuO/BiVO4膜和CuxO/BiVO4膜的电化学水氧化活性和稳定性均有显著提高。正如预期的那样，由于氧化铜与BiVO4之间的p-n结效应，三种氧化铜/BiVO4薄膜上电荷的辐射复合都有所减少。然而，我们的研究表明，当太阳光照射铜氧化物/BiVO4光阳极时，可以引发铜氧化物上的电催化水氧化；因此，铜氧化物偶联对BiVO4水氧化动力学的改善比对BiVO4电荷分离热力学的改善更为明显。在三种氧化铜/BiVO4膜中，由BiVO4膜与Cu2O/CuO纳米粒子组合组成的CuxO/BiVO4膜表现出最好的太阳能水氧化性能，这是因为CuxO的水氧化电催化活性比单独的Cu2O或CuO更好。本工作的动力学研究和分析为铜氧化物/BiVO4光阳极的太阳能水氧化机理提供了全面的见解。(C) 2019电化学学会。
N-type BiVO4 films coupled with p-type copper oxide nanoparticles were investigated as photoanodes for water oxidation. Compared with the BiVO4 film, the Cu2O/BiVO4, CuO/BiVO4 and CuxO/BiVO4 films all showed significantly improved photoelectrochemical water oxidation activity and stability. As expected, the radiative recombination of charge on the three kinds of copper oxide/BiVO4 films was decreased due to the p-n junction effect between copper oxide and BiVO4. However, our investigations indicated that the electrocatalytic water oxidation on the copper oxide could be initiated when the copper oxide/BiVO4 photoanodes were irradiated by solar light; therefore, the copper oxide-coupling resulted in a more obvious improvement in the water oxidation kinetics of BiVO4 than the thermodynamic improvement in the charge separation of BiVO4. Of the three kinds of copper oxide/BiVO4 films, the CuxO/BiVO4 film comprising BiVO4 film coupled with a combination of Cu2O/CuO nanoparticles showed the best solar water oxidation performance due to the better electrocatalytic activity for water oxidation of CuxO compared with Cu2O or CuO alone. The kinetic investigations and analyses in the present work provide comprehensive insight into the mechanism of the copper oxide/BiVO4 photoanodes for solar water oxidation. (C) 2019 The Electrochemical Society.