过电位
塔菲尔方程
催化作用
电催化剂
材料科学
碳纳米管
钼
化学工程
碳化物
无机化学
纳米技术
化学
复合材料
冶金
电化学
有机化学
物理化学
电极
工程类
作者
Yunjie Huang,Yaqi Bao,Tieqi Huang,Chengzhi Hu,Hengwei Qiu,Hongtao Liu
出处
期刊:Molecules
[MDPI AG]
日期:2022-12-26
卷期号:28 (1): 192-192
被引量:6
标识
DOI:10.3390/molecules28010192
摘要
Molybdenum carbide is considered to be one of the most competitive catalysts for hydrogen evolution reaction (HER) regarding its high catalytic activity and superior corrosion resistance. But the low electrical conductivity and poor interfacial contact with the current collector greatly inhibit its practical application capability. Herein, carbon nanotube (CNT) supported molybdenum carbide was assembled via electrostatic adsorption combined with complex bonding. The N-doped molybdenum carbide nanocrystals were uniformly anchored on the surfaces of amino CNTs, which depressed the agglomeration of nanoparticles while strengthening the migration of electrons. The optimized catalyst (250-800-2h) showed exceptional electrocatalytic performance towards HER under both acidic and alkaline conditions. Especially in 0.5 M H2SO4 solution, the 250-800-2h catalyst exhibited a low overpotential of 136 mV at a current density of 10 mA/cm2 (η10) with the Tafel slope of 49.9 mV dec-1, and the overpotential only increased 8 mV after 20,000 cycles of stability test. The active corrosive experiment revealed that more exposure to high-activity γ-Mo2N promoted the specific mass activity of Mo, thus, maintaining the catalytic durability of the catalyst.
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