材料科学
镍
钴
硫化钴
硫化氢
离子交换
电解
化学工程
膜
金属
无机化学
硫化物
多孔性
硫化镍
离子
电极
电化学
冶金
电解质
复合材料
硫黄
物理化学
有机化学
化学
生物
工程类
遗传学
作者
Hyeonggeun Choi,Seunghwan Jo,HeeYoung Lim,Young‐Woo Lee,Jung Inn Sohn
标识
DOI:10.1016/j.surfin.2024.103987
摘要
For practical water electrolysis-based hydrogen production, the development of efficient electrocatalysts based on earth-abundant materials is highly desirable. Herein, metal-organic framework (MOF) derived Co-incorporated nickel sulfide (MD-Co/NiS2) is demonstrated as a promising hydrogen evolution reaction (HER) electrocatalyst in an anion exchange membrane water electrolyzer (AEMWE). The MD-Co/NiS2 exhibits a porous structure packed with numerous nanoparticles while maintaining the primary spherical morphology of the MOF, resulting in a large surface area with enhanced porosity. Furthermore, the reaction kinetics is enhanced by alleviating the charge polarization of Ni and S after Co incorporation. Owing to the integrated benefits of the geometrical and chemical structures, MD-Co/NiS2 requires a low overpotential of 117 mV with long-term stability for 50 h at a current density of 10 mA cm−2 in 1 M KOH. Moreover, AEMWE using MD-Co/NiS2 as a cathode catalyst requires a low cell voltage of 1.97 V at a high current density of 1 A cm−2, comparable to that of commercial Pt/C (2.01 V) and maintains cell performance for 50 h with a small potential increase of 55 mV.
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