Photoinduced Absorption Spectroscopy of CoPi on BiVO4: The Function of CoPi during Water Oxidation
Photoinduced Absorption Spectroscopy of CoPi on BiVO4: The Function of CoPi during Water Oxidation
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DOI：
10.1002/adfm.201600711
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发表时间：
2016-07-19
影响因子：
19
通讯作者：
Durrant, James R.
中科院分区：
文献类型：
--
作者：
Ma, Yimeng;Kafizas, Andreas;Durrant, James R.
本文采用光诱导吸收和电化学技术来分析驱动光电化学水氧化钒酸铋（BiVO 4），有和没有磷酸钴（CoPi）助催化剂的电荷载流子动力学。这些结果与光谱电化学测量Co-II氧化Co-III在CoPi/FTO（掺氟氧化锡）电极在黑暗的电催化水氧化。电催化水氧化表现出对Co-III密度的非线性依赖性，在1 × 10（17）Co-III cm（-2）处具有急剧的开始。这些结果进行了定量比较与CoPi-BiVO 4光阳极上的光诱导水氧化的条件下观察到的CoPi氧化的程度。对于本文研究的CoPi-BiVO 4光阳极，
This paper employs photoinduced absorption and electrochemical techniques to analyze the charge carrier dynamics that drive photoelectrochemical water oxidation on bismuth vanadate (BiVO4), both with and without cobalt phosphate (CoPi) co-catalyst. These results are correlated with spectroelectrochemical measurements of Co-II oxidation to Co-III in a CoPi/FTO (fluorine doped tin oxide) electrode during dark electrocatalytic water oxidation. Electrocatalytic water oxidation exhibits a non-linear dependence on Co-III density, with a sharp onset at 1 x 10(17) Co-III cm(-2). These results are compared quantitatively with the degree of CoPi oxidation observed under conditions of photoinduced water oxidation on CoPi-BiVO4 photoanodes. For the CoPi-BiVO4 photoanodes studied herein,