塔菲尔方程
无定形固体
电化学
催化作用
制氢
材料科学
X射线光电子能谱
钼
化学工程
氢
无机化学
硫化氢
硫化物
化学
冶金
硫黄
电极
结晶学
有机化学
物理化学
工程类
作者
Daniel Merki,Stéphane Fierro,Heron Vrubel,Xile Hu
出处
期刊:Chemical Science
[The Royal Society of Chemistry]
日期:2011-04-14
卷期号:2 (7): 1262-1267
被引量:1243
摘要
Amorphous molybdenum sulfide films are efficient hydrogen evolution catalysts in water. The films are prepared via simple electro-polymerization procedures and are characterized by XPS, electron microscopy and electronic absorption spectroscopy. Whereas the precatalysts could be MoS3 or MoS2, the active form of the catalysts is identified as amorphous MoS2. Significant geometric current densities are achieved at low overpotentials (e.g., 15 mA cm−2 at η = 200 mV) using these catalysts. The catalysis is compatible with a wide range of pHs (e.g., 0 to 13). The current efficiency for hydrogen production is quantitative. A 40 mV Tafel slope is observed, suggesting a rate-determining ion+atom step. The turnover frequency per active site is calculated. The amorphous molybdenum sulfide films are among the most active non-precious hydrogen evolution catalysts.
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