电催化剂
材料科学
微型多孔材料
过电位
化学工程
镍
制氢
电流密度
分解水
电解质
纳米孔
电化学
异质结
氢
无机化学
纳米技术
催化作用
化学
电极
物理化学
冶金
复合材料
光电子学
光催化
有机化学
工程类
物理
量子力学
作者
Wen-Jun He,Rui Zhang,Da Cao,Ying Li,Jun Zhang,Qiuyan Hao,Hui Liu,Jianling Zhao,Huolin L. Xin
出处
期刊:Small
[Wiley]
日期:2022-11-14
卷期号:19 (2)
被引量:36
标识
DOI:10.1002/smll.202205719
摘要
Exploiting active and stable non-precious metal electrocatalysts for alkaline hydrogen evolution reaction (HER) at large current density plays a key role in realizing large-scale industrial hydrogen generation. Herein, a self-supported microporous Ni(OH)x/Ni3 S2 heterostructure electrocatalyst on nickel foam (Ni(OH)x/Ni3 S2 /NF) that possesses super-hydrophilic property through an electrochemical process is rationally designed and fabricated. Benefiting from the super-hydrophilic property, microporous feature, and self-supported structure, the electrocatalyst exhibits an exceptional HER performance at large current density in 1.0 M KOH, only requiring low overpotential of 126, 193, and 238 mV to reach a current density of 100, 500, and 1000 mA cm-2 , respectively, and displaying a long-term durability up to 1000 h, which is among the state-of-the-art non-precious metal electrocatalysts. Combining hard X-rays absorption spectroscopy and first-principles calculation, it also reveals that the strong electronic coupling at the interface of the heterostructure facilitates the dissociation of H2 O molecular, accelerating the HER kinetics in alkaline electrolyte. This work sheds a light on developing advanced non-precious metal electrocatalysts for industrial hydrogen production by means of constructing a super-hydrophilic microporous heterostructure.
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