期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 13, 页码 10898-10908出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b00305
关键词
photoelectrochemical hydrogen evolution; amorphous molybdenum sulfide; cocatalyst; cyclic voltammetry; antimony triselenide photocathode
资金
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [2012R1A3A2026417]
Amorphous molybdenum sulfide (a-MoSx) is a promising hydrogen evolution catalyst owing to its low cost and high activity. A simple electrodeposition method (cyclic voltammetry) allows uniform formation of a-MoSx films on conductive surfaces. However, the morphology of a-MoSx deposited on a TiO2/Sb2Se3 photocathode could be modulated by varying the starting potential. The cathodically initiated a-MoSx showed conformal filmlike morphology, whereas anodic initiation induced inhomogeneous particulate deposition. The filmlike morphology of a-MoSx was subjected to catalyst activation, which improved the photocurrent density and reduced the charge-transfer resistance at the semiconductor/electrolyte interface, as compared to that of its particulate counterpart. X-ray photoelectron spectroscopy confirmed that different chemical states of a-MoSx (photoelectrochemically active sites) were developed on the basis of the electrodeposited a-MoSx morphology. The research provides an effective approach for uniformly depositing cost-effective a-MoSx on nanostnictured photoelectrodes, for photoelectrochemical water splitting.
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