过电位
化学
催化作用
电解水
制氢
过渡金属
兴奋剂
电化学
纳米技术
贵金属
电催化剂
氢
化学工程
电解
分解水
材料科学
光催化
物理化学
光电子学
电极
电解质
工程类
生物化学
有机化学
作者
Yi Shi,Yue Zhou,Daoguo Yang,Weixuan Xu,Chen Wang,Feng‐Bin Wang,Jing‐Juan Xu,Xing‐Hua Xia,Hong‐Yuan Chen
摘要
Water-splitting devices for hydrogen generation through electrolysis (hydrogen evolution reaction, HER) hold great promise for clean energy. However, their practical application relies on the development of inexpensive and efficient catalysts to replace precious platinum catalysts. We previously reported that HER can be largely enhanced through finely tuning the energy level of molybdenum sulfide (MoS2) by hot electron injection from plasmonic gold nanoparticles. Under this inspiration, herein, we propose a strategy to improve the HER performance of MoS2 by engineering its energy level via direct transition-metal doping. We find that zinc-doped MoS2 (Zn-MoS2) exhibits superior electrochemical activity toward HER as evidenced by the positively shifted onset potential to −0.13 V vs RHE. A turnover of 15.44 s–1 at 300 mV overpotential is achieved, which by far exceeds the activity of MoS2 catalysts reported. The large enhancement can be attributed to the synergistic effect of electronic effect (energy level matching) and morphological effect (rich active sites) via thermodynamic and kinetic acceleration, respectively. This design opens up further opportunities for improving electrocatalysts by incorporating promoters, which broadens the understanding toward the optimization of electrocatalytic activity of these unique materials.
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