过电位
塔菲尔方程
钌
电催化剂
兴奋剂
电解
异质结
分解水
电解水
密度泛函理论
材料科学
化学
无机化学
化学工程
物理化学
催化作用
电化学
计算化学
光电子学
电极
光催化
工程类
电解质
生物化学
作者
Haowen Ren,Shihong Chen,Chong Chen,Qiu Yang,Chunhui Luo,Qiang Zhao,Wei Yang
出处
期刊:Dalton Transactions
[The Royal Society of Chemistry]
日期:2023-01-01
卷期号:52 (15): 4891-4899
被引量:2
摘要
Electrocatalyst design is an important approach to prompt the commercialization of water electrolysis technologies. In this work, a ruthenium doped MoS2/AB heterostructure is synthesized as an electrocatalyst for the hydrogen evolution reaction (HER) through hydrothermal and annealing processes. The physical-chemical characterization studies show that the MoS2/AB heterostructure and the incorporation of Ru effectively induce a phase transition from 2H to 1T-MoS2. The as-prepared Ru-MoS2/AB exhibits an excellent HER performance with a very low overpotential of 13 mV at 10 mA cm-2 and a Tafel slope of 31 mV dec-1 in 0.5 M H2SO4, remarkably higher than those of Pt/C (overpotential of 28 mV at 10 mA cm-2, 41 mV dec-1). Density functional theory calculations suggest that the H absorption on Ru bonding to S exhibits a rather low binding energy (-0.22 eV), indicating the optimum active sites of Ru near S for HER. Significantly, the Ru-MoS2/AB also demonstrates high stability under long-term discharge and elevated temperature conditions. These results suggest that the as-prepared Ru-MoS2/AB can be a promising alternative to Pt/C for water electrolysis, due to its high HER activity, easy synthesis, and good stability.
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