光电阴极
退火(玻璃)
光电流
材料科学
电解质
薄膜
分解水
分析化学(期刊)
光电化学
电极
电化学
冶金
光电子学
纳米技术
化学
光催化
电子
物理化学
量子力学
生物化学
物理
催化作用
色谱法
作者
Soolmaz Jamali,Ahmad Moshaii,Nasim Mohammadian
标识
DOI:10.1002/pssa.201700380
摘要
The synthesization of Cu 2 O thin films by electrodeposition for photoelectrochemical water splitting is reported. The synthesized Cu 2 O samples are annealed at different temperatures between 300 and 500 °C. The XRD analysis and SEM images indicate that the sample without annealing includes Cu 2 O grains with pyramid shape. With annealing to more than 300 °C, due to the oxidization of the sample, a thin layer of CuO appears on the original Cu 2 O film and the crystalline signatures of such CuO structure increase with annealing at higher temperatures. The photoelectrochemical measurements indicate that annealing pure Cu 2 O by more than 300 °C, remarkably increases the photocurrent achieved from this photocathode. The effect is accompanied with considerable improvement of chemical stability of the original Cu 2 O electrode during water splitting. Such protection effect, which is originated from generation of CuO on the samples, increases with the annealing temperature up to 500 °C. However, the best photocurrent from the Cu 2 O/CuO composite is obtained from the annealing temperature of about 400 °C. The results of impedance analysis of various annealed samples indicate that annealing at a higher temperature, better charge transfer occurs both at the interface of photocathode/electrolyte and inside the photocathode.
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