电负性
惰性
材料科学
氟
兴奋剂
催化作用
活动站点
化学物理
电极
氢
纳米技术
化学工程
光电子学
GSM演进的增强数据速率
无机化学
化学
物理化学
计算机科学
工程类
电信
生物化学
有机化学
冶金
作者
Ruihua Zhang,Mengru Zhang,Hao Yang,Gen Li,Shu-Ming Xing,Mengyan Li,Yiling Xu,Qiuyue Zhang,Sheng Hu,Hong‐Gang Liao,Yang Cao
标识
DOI:10.1002/smtd.202100612
摘要
The edge sites of MoS2 are catalytically active for hydrogen evolution reactions (HER). However, pristine edge sites usually contain only intrinsic atoms or defects, limiting the tuning of on-site hydrogen species adsorption and desorption, the critical steps for HER. In addition, the number of atoms on pristine edges is small compared to that of electrochemically inert atoms in bulk. Thus, it is desirable to develop a scalable technique of creating a large number of highly HER-active edge sites. Here, a plasma etching strategy is developed for creating MoS2 edge electrodes with a controllable number of active sites that enable the quantitative characterization of their HER activity using a local probe method. Fluorine atoms with large electronegativity are doped on the MoS2 edge sites that lead to a fivefold activity enhancement compared to that from pristine edges and is attributed to the more moderate binding energy for hydrogen species. The scalability of such a method is further demonstrated by activating MoS2 catalyst in macroscopic quantities with enhanced HER performance and stability. The work provides two-dimensional materials as a platform for understanding the doping effect on the edge sites at atomic-level, and offers a novel route for the design of efficient catalysts.
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