Highly efficient water electrolysis of 3-D distribution of graphene in Ni-Al intermetallic compound electrode in alkaline media

IF 5.5 3区 材料科学 Q1 ELECTROCHEMISTRY
Hongdi Zheng, Liuyan Zhang, Yingying Li, Binkai Yuan, Shixuan Wang, Zeyi Guan, Gengzhe Shen, Guibin Tan, Yanmei Zhang
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引用次数: 0

Abstract

A honeycomb-like porous self-supporting Ni-Al(G) electrode was successfully prepared by low-pressure cold spraying combined with heat treatment. The main components of the electrode were Ni and NiAl. Graphene was uniformly dispersed throughout the electrode, exhibiting a 3-D distribution, which increased the active site of electrode and improved the electron exchange rate. The electrochemical properties of the Ni-Al(G) electrode were characterized using 6 M KOH. As a result, the Ni-Al(G) electrode requires only an overpotential of 130 mV to achieve a current density of 100 mA cm−2, and a Tafel slope of 35.5 mV dec−1. In addition, the electrode exhibited excellent stability. The addition of graphene and the honeycomb-like porous structure of the Ni-Al(G) electrode resulted in an excellent hydrogen evolution activity. This study provides a simple and rapid technique for building high-performance, low-cost, and industrially available electrodes for the efficient alkaline HER.
碱性介质中镍铝金属间化合物电极中石墨烯三维分布的高效水电解
采用低压冷喷涂与热处理相结合的方法成功制备了蜂窝状多孔自支撑Ni-Al(G)电极。电极的主要成分是Ni和NiAl。石墨烯均匀地分散在电极上,呈三维分布,增加了电极的活性位点,提高了电子交换速率。用6 M KOH对Ni-Al(G)电极的电化学性能进行了表征。因此,Ni-Al(G)电极只需要130 mV的过电位就可以达到100 mA cm−2的电流密度,Tafel斜率为35.5 mV dec−1。此外,该电极还具有良好的稳定性。石墨烯的加入和Ni-Al(G)电极的蜂窝状多孔结构导致了优异的析氢活性。本研究为构建高效碱性HER的高性能、低成本和工业可用电极提供了一种简单快速的技术。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Electrochimica Acta
Electrochimica Acta 工程技术-电化学
CiteScore
11.30
自引率
6.10%
发文量
1634
审稿时长
41 days
期刊介绍: Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.
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