光电阴极
光电流
材料科学
分解水
光催化
硅
原子层沉积
光电子学
化学气相沉积
介电谱
基质(水族馆)
蚀刻(微加工)
图层(电子)
纳米技术
电化学
化学
电极
催化作用
量子力学
海洋学
物理
地质学
电子
物理化学
生物化学
作者
Pengfei Cheng,Yuanwu Liu,Mario Ziegler,Malte Klingenhof,Dong Wang,Zhang Zhang,Peter Strasser,Peter Schaaf
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2022-06-17
卷期号:5 (7): 8222-8231
被引量:5
标识
DOI:10.1021/acsaem.2c00761
摘要
Photoelectrochemical (PEC) water splitting for H2 production is a possible alternative for fossil energy in the future. However, there exists three problems in PEC water splitting with the silicon (Si) photocathode: poor light absorption of the untreated Si substrate, bad stability in strong acid solution, and poor photocatalytic activity of Si. Here, a strategy of dual interface engineering and photocatalyst deposition is proposed to improve the PEC performance, which consists of fabricating black Si (b-Si) by reactive ion etching, depositing of TiO2 on the b-Si by atomic layer deposition, and growing ReS2 on top of the TiO2 by chemical vapor deposition. Owing to the suitable band alignment of b-Si, TiO2, and ReS2, the ReS2/TiO2/b-Si shows obviously enhanced PEC performance compared to b-Si, TiO2/b-Si, and ReS2/b-Si photocathodes. Results of electrochemical impedance spectroscopy and Mott–Schottky plot analysis demonstrate that the TiO2 layer plays an important role and the charge-transfer kinetics of the system is clearly improved. Transient photocurrent measurements indicate that the ReS2/TiO2/b-Si photocathode has the most remarkable photocurrent response. In addition, the ReS2/TiO2/b-Si photocathode also shows excellent stability after being operated for 25 h.
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