催化作用
杂原子
兴奋剂
材料科学
电化学
化学工程
钼
碳纤维
无机化学
化学
电极
物理化学
有机化学
戒指(化学)
光电子学
复合材料
复合数
工程类
作者
Dezhi Wang,Tianying Liu,Junchao Wang,Zhuangzhi Wu
出处
期刊:Carbon
[Elsevier]
日期:2018-11-01
卷期号:139: 845-852
被引量:95
标识
DOI:10.1016/j.carbon.2018.07.043
摘要
Recently, molybdenum carbide (Mo2C) has aroused tremendous interests as a potential candidate to replace Pt-based electrocatalysts for hydrogen evolution reaction (HER). However, the HER performance of Mo2C is intrinsically limited by the empty d-orbitals with a large density in Mo2C and the resulting strong Mo-H bonding. Heteroatom-doping is an effective route for tuning the d-orbitals of Mo2C and improving the catalytic activity. Hence, in this work, we design two facile pathways to synthesize unique N, P and N, S dual-doped Mo2C/C hybrid electrocatalysts as highly active HER catalysts. The co-doping of N, P and N, S involves the substitute of C atoms in both Mo2C crystals and carbon matrix for a better synergistic effect, and can further improve the HER activity of Mo2C electrocatalysts compared to individual N doping. As expected, the obtained N, P or N, S dual-doped Mo2C catalyst (NP-Mo2C or NS-Mo2C) exhibits lower electrochemical resistance, higher intrinsic activity of each active site, or larger electrochemically active surface area (AECSA, for NP-Mo2C), thus leading to enhanced HER activity as well as stability in the acidic solution.
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