离解(化学)
兴奋剂
化学
氢键
硫黄
分解水
氢
化学工程
催化作用
无机化学
材料科学
分子
物理化学
有机化学
光催化
光电子学
工程类
作者
Min Seok Yang,Yu-Xin Guo,Lihua Zhan,Xiaoyun Li,Qing Huang,Xiao‐Yu Yang,Cuifang Ye,Yu Li,Jinping Liu,Bao‐Lian Su,Yi Long Wang
出处
期刊:Langmuir
[American Chemical Society]
日期:2022-12-16
卷期号:39 (1): 236-248
被引量:6
标识
DOI:10.1021/acs.langmuir.2c02435
摘要
Besides improving charge transfer, there are two key factors, such as increasing active sites and promoting water dissociation, to be deeply investigated to realize high-performance MoS2-based electrocatalysts in alkaline hydrogen evolution reaction (HER). Herein, we have demonstrated the synergistic engineering to realize rich unsaturated sulfur atoms and activated O-H bonds toward the water for Ni-doped MoS2/CoS2 hierarchical structures by an approach to Ni doping coupled with in situ sulfurizing for excellent alkaline HER. In this work, the Ni-doped atoms are evolved into Ni(OH)2 during alkaline HER. Interestingly, the extra unsaturated sulfur atoms will be modulated into MoS2 nanosheets by breaking Ni-S bonds during the formation of Ni(OH)2. On the other hand, the higher the mass of the Ni precursor (mNi) for the fabrication of our samples, the more Ni(OH)2 is evolved, indicating a stronger ability for water dissociation of our samples during alkaline HER. Our results further reveal that regulating mNi is crucial to the HER activity of the as-synthesized samples. By regulating mNi to 0.300 g, a balance between increasing active sites and promoting water dissociation is achieved for the Ni-doped MoS2/CoS2 samples to boost alkaline HER. Consequently, the optimal samples present the highest HER activity among all counterparts, accompanied by reliable long-term stability. This work will promise important applications in the field of electrocatalytic hydrogen evolution in alkaline environments.
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