电催化剂
析氧
电解水
电解
电化学
电解质
阳极
镍
分解水
化学工程
电极
无机化学
材料科学
化学
催化作用
冶金
物理化学
有机化学
工程类
光催化
作者
Leran Liu,Yijie Zhang,Jinwei Wang,Rui Yao,Yun Wu,Qiang Zhao,Jinping Li,Guang Liu
标识
DOI:10.1016/j.ijhydene.2022.02.211
摘要
Industrial electrolysis of water is one of the effective strategies for green hydrogen production in the future. Nevertheless, the large-scale applications of water electrolysis are still intractable issues hindered by the high overpotentials and inferior reaction kinetics on the anode. Herein, a facile one-step hydrothermal method was applied to in situ growth the Fe and V co-doped Ni3S2 electrocatalyst on nickel foam substrate (Fe, V–Ni3S2/NF). In 1 M KOH electrolyte, the as-prepared Fe, V–Ni3S2/NF electrode exhibited an improved water oxidation activity with ultralow overpotentials of 253 and 370 mV to realize large current densities of 100 and 1000 mA/cm2, respectively. More importantly, the Fe, V–Ni3S2/NF electrode existed an activation process during 100 h chronopotentiometry testing period. Detailed characterizations revealed that elements of V and S in the electrocatalyst were oxidized and dissolved into the electrolyte, making the electrocatalyst undergo surface reconstruction and resulting in a faster kinetic reaction rate, thus leading to enhanced oxygen evolution reaction activities. Collectively, the resultant Fe, V–Ni3S2/NF in this work provides new cogitation towards design and synthesis of low-cost electrocatalyst with large current densities for water oxidation.
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