Effect of Electrolytes on the Selectivity and Stability of n-type WO3 Photoelectrodes for Use in Solar Water Oxidation
Effect of Electrolytes on the Selectivity and Stability of n-type WO3 Photoelectrodes for Use in Solar Water Oxidation
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DOI：
10.1021/jp209909b
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发表时间：
2012-04-12
影响因子：
3.7
通讯作者：
Choi, Kyoung-Shin
中科院分区：
文献类型：
--
作者：
Hill, James C.;Choi, Kyoung-Shin
采用电化学方法制备了高比表面积多孔n型WO 3电极，并将其作为光阳极用于水裂解光电化学电池。在pH 1、3和S下制备了含有不同阴离子（乙酸根、氯离子、磷酸根、高氯酸根和硫酸根）和阳离子（Li+、Na+和K+）的各种电解质，以研究这些阴离子和阳离子如何影响水在WO 3表面上的光氧化反应的效率。为了定量地比较它们对O-2析出的影响，通过同时测量在密封的分隔电池中产生的光电流和O-2来获得每种电解质的光电流到氧的转化效率。竞争反应的类型存在于每个电解质和它们对水氧化为O-2或过氧化氢，这是已知的积累在WO 3表面上，并导致光腐蚀的影响进行了研究。在这项研究中报告的结果将是有用的，在制定最佳的电解质组合物，以提高所需的光氧化反应的各种光电化学电池。
High surface area porous n-type WO3 electrodes were prepared electrochemically and used as a photoanode in a water-splitting photoelectrochemical cell. Various electrolytes containing different anions (acetate, chloride, phosphate, perchlorate, and sulfate) and cations (Li+, Na+, and K+) were prepared at pH 1, 3, and S to investigate how these anions and cations affect the efficiency of the photo-oxidation reaction of water on the WO3 surface. To quantitatively compare their effects on O-2 evolution, photocurrent to oxygen conversion efficiency was obtained for each electrolyte by simultaneously measuring photocurrent and O-2 produced in a sealed divided cell. The type of competing reactions present in each electrolyte and their effects on water oxidation to O-2 or to hydrogen peroxide, which is known to accumulate on the WO3 surface and cause photocorrosion, were investigated. The results reported in this study will be useful in formulating optimum electrolyte compositions to enhance desired photo-oxidation reactions for various photoelectrochemical cells.