期刊
NANO ENERGY
卷 74, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2020.104850
关键词
Tuning d-band center; Tungsten carbide; Mo dopants; Hydrogen evolution; Wide pH range
类别
资金
- National Natural Science Foundation of China [51702284, 21878270, 21922811, 21961160742]
- Zhejiang Provincial Natural Science Foundation of China [LGJ18E080001]
- Fundamental Research Funds for the Central Universities
- Startup Foundation for Hundred-Talent Program of Zhejiang University
Designing highly active transition metal carbides based electrocatalysts to substitute for the state-of-the-art noble-metal materials for hydrogen evolution reaction (HER) over a wide pH range is still a crucial challenge. Herein, we reported a novel 2D hybrid electrocatalyst containing Mo-doped WC core with particle size of similar to 5 nm embedded into N-doped carbon shells (Mo-WC@NCS) through a carbonization treatment of Mo-doped W/Zn bimetallic-imidazolate frameworks. Benefiting from large surface area and optimized electronic structure, the achieved Mo-WC@NCS hybrid displayed a low overpotential of 179 mV at 10 mA cm(-2) with a small Tafel slope of 81 mV dec(-1) for HER in base, showing almost the best performance among all previously reported WC-based hybrid HER electrocatalysts. This Mo-WC@NCS hybrid also delivered robust HER catalytic activities in both acidic and neutral media. Experimental observations and theoretical calculations demonstrated that the d-band center of W in Mo-WC@NCS hybrid was obviously downshifted after Mo dopants, which was beneficial to modulate the electronic structure of the W centers and thereby facilitated the H desorption, thus boosting hydrogen generation. Acting as a cathode in alkaline-acid Zn-H2O fuel cell, the Mo-WC@NCS hybrid delivered a power density of up to 41.4 mW cm(-2) and maintained a long-term stability for H-2 generation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据