光电阴极
覆盖层
材料科学
碳纤维
氧化物
分解水
异质结
电解质
罗丹明B
图层(电子)
电极
化学工程
光电子学
光催化
纳米技术
化学
复合数
催化作用
复合材料
物理化学
冶金
生物化学
电子
工程类
物理
量子力学
作者
Pramod Patil Kunturu,Jurriaan Huskens
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2019-10-30
卷期号:2 (11): 7850-7860
被引量:53
标识
DOI:10.1021/acsaem.9b01290
摘要
Photoelectrochemical (PEC) solar water splitting has received extensive attention because it promises to provide an alternative and sustainable source of energy. A key challenge is to achieve a stable PEC system in either acidic or basic electrolyte without degradation of the (photo)electrodes. We have used a cubic Cu2O film and porous granular bilayer Cu2O/CuO composite with a carbon protection layer as photocathode materials. The films were deposited under different conditions, such as variation of the electrodeposition time, thermal oxidation of the Cu2O films in air versus nitrogen atmosphere, and deposition of the carbon materials, and were investigated structurally and with regard to their PEC performance. The optimized electrodes showed photocurrents up to 6.5 and 7.5 mA/cm–2 at potentials of 0 and −0.1 V vs RHE at pH 5.5, respectively. The stabilities of the Cu2O/C and Cu2O/CuO/C photocathodes, at a low bias of 0.3 V vs RHE, were retained after 50 h. The strongly improved photostability of the photocathodes in comparison to electrodes in the absence of a carbon overlayer is attributed to a more effective charge transfer and a protective role of carbon against photocorrosion.
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