Alpha-Nickel Hydroxide Coating of Metallic Nickel for Enhanced Alkaline Hydrogen Evolution

被引：11

作者：

Xue, Song ^{[1
]}

Liang, Yunchang ^{[2
,3
]}

Hou, Shujin ^{[4
]}

Zhang, Yajing ^{[1
,5
]}

Jiang, Heqing ^{[1
]}

机构：

[1] Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, Qingdao Key Lab Funct Membrane Mat & Membrane Tec, Qingdao 266101, Peoples R China

[2] Ecole Polytech Fed Lausanne EPFL, Max Planck EPFL Lab Mol Nanosci & Technol, CH-1015 Lausanne, Switzerland

[3] Ecole Polytech Fed Lausanne EPFL, Inst Phys IPHYS, CH-1015 Lausanne, Switzerland

[4] Tech Univ Munich, Dept Phys, Phys Energy Convers & Storage, James Franck Str 1, D-85748 Garching, Germany

[5] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

CHEMSUSCHEM | 2022年 / 15卷 / 18期

基金：

中国博士后科学基金;

关键词：

electrolysis; hydrogen evolution; nickel; synergy; water splitting; OXYGEN EVOLUTION; ELECTRODES; ELECTROCATALYST; OXIDE; NANOPARTICLES; MECHANISM; FOAM;

D O I：

10.1002/cssc.202201072

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In this work, alkaline hydrogen evolution reaction (HER) processes of three typical nickel-based electrocatalysts [i.e., Ni, alpha-Ni(OH)(2), and beta-Ni(OH)(2)] were investigated to probe critical factors that determine the activity and durability. The HER activity trend was observed as Ni >>alpha-Ni(OH)(2) > beta-Ni(OH)(2), likely attributed to a synergy between metallic Ni and Ni(OH)(2) components on the Ni surface and fast water dissociation kinetics on the alpha-Ni(OH)(2) surface. With the HER proceeding, the metallic Ni surface, however, gradually became alpha-Ni(OH)(2), and alpha-Ni(OH)(2) surface ultimately transformed into beta-phase, leading to a dramatic activity decrease of Ni electrodes. Therefore, Ni electrodes were coated with alpha-Ni(OH)(2) nanosheets to slow down the nickel hydroxylation and optimize the surface ratio of Ni(OH)(2) to metallic Ni. This simple coating procedure enhanced both activity and durability of Ni electrocatalysts.

引用

页数：10

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