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Solution-Processed Cu2S Photocathodes for Photoelectrochemical Water Splitting
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-02-26 00:00:00 , DOI: 10.1021/acsenergylett.7b01326
Yu-Xiang Yu 1, 2 , Linfeng Pan 3 , Min-Kyu Son 2 , Matthew T. Mayer 2 , Wei-De Zhang 1 , Anders Hagfeldt 3 , Jingshan Luo 2 , Michael Grätzel 2
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Cu2S has been regarded as a promising solar energy conversion material because of its favorable visible light absorption and earth abundance. Here, we present an indirect preparation method via a solution-processed ion exchange reaction to synthesize stoichiometric Cu2S films with high photoactivity. In addition, we developed a chemical bath deposition method to fabricate CdS buffer layers on Cu2S by adding a reducing agent in the precursor solution, avoiding oxidation of Cu2S. After being coated with the TiO2 protection layer and the RuOx hydrogen evolution catalyst, the Cu2S photoelectrode delivers a photocurrent density of 7.0 mA cm–2 at −0.3 V vs RHE and an onset potential of 0.48 V vs RHE under AM 1.5G simulated sunlight illumination for solar driven water reduction. To our knowledge, this is the first time that Cu2S has been used for solar hydrogen evolution with encouraging performance, which will stimulate further studies on Cu-based photocathodes.

中文翻译:

用于光电化学水分解的固溶处理Cu 2 S光电阴极

Cu 2 S由于其有利的可见光吸收和土壤丰度而被认为是有前途的太阳能转换材料。在这里,我们提出了一种通过溶液处理的离子交换反应间接制备具有高光活性的化学计量Cu 2 S膜的间接制备方法。此外,我们开发了一种化学浴沉积方法,通过在前体溶液中添加还原剂避免在Cu 2 S上氧化,从而在Cu 2 S上制造CdS缓冲层。在涂覆TiO 2保护层和RuO x氢后析出催化剂,Cu 2 S光电极可提供7.0 mA cm –2的光电流密度在AM 1.5G模拟阳光照射下,相对于RHE的电压为-0.3 V,相对于RHE的起始电势为0.48 V的相对于RHE,用于太阳能驱动的减水。据我们所知,这是首次以令人鼓舞的性能将Cu 2 S用于太阳能氢的释放,这将刺激对基于铜的光阴极的进一步研究。
更新日期:2018-02-26
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