Powder metallurgy synthesis of porous Ni-Fe alloy for oxygen evolution reaction and overall water splitting
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第2期
论文作者：Wenbo Li Qingfeng Hu Yunwei Liu Mengmeng Zhang Jiajun Wang Xiaopeng Han Cheng Zhong Wenbin Hu Yida Deng
文章页码：154 - 160
摘 要：Developing inexpensive and high efficient catalysts is essential for generating oxygen and hydrogen via water splitting. Herein, based on powder metallurgy, a Ni-Fe based compound（Ni8Fe2 alloy） with unique porous structure and controllable phase has been designed and synthesized. Without using a solvent or template, the alloy exhibits a porous structure with uniformly distributed multi-phase. The obtained Ni8Fe2 alloy exhibits an efficient oxygen evolution reaction（OER） performance and good longterm stability in alkaline electrolyte（i.e. 1.0 M KOH）. Additionally, an alkaline water splitting device has been assembled using porous Ni8Fe2 alloy as both anode and cathode materials. The system requires a cell voltage of 1.65 V to reach the 10 mA cm-2 current density for overall water splitting and maintains good stability for 25 h. The efficient electrocatalytic performance of the Ni8Fe2 alloy is owing to the unique porous microstructure, increased active sites and accelerated charge transfer. Consequently, the reaction kinetics of OER are significantly promoted.
Wenbo Li1，Qingfeng Hu1，Yunwei Liu1，Mengmeng Zhang1，Jiajun Wang2，Xiaopeng Han1，Cheng Zhong1，Wenbin Hu1，Yida Deng1
1. Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University2. School of Chemical Engineering and Technology, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University
摘 要：Developing inexpensive and high efficient catalysts is essential for generating oxygen and hydrogen via water splitting. Herein, based on powder metallurgy, a Ni-Fe based compound（Ni8Fe2 alloy） with unique porous structure and controllable phase has been designed and synthesized. Without using a solvent or template, the alloy exhibits a porous structure with uniformly distributed multi-phase. The obtained Ni8Fe2 alloy exhibits an efficient oxygen evolution reaction（OER） performance and good longterm stability in alkaline electrolyte（i.e. 1.0 M KOH）. Additionally, an alkaline water splitting device has been assembled using porous Ni8Fe2 alloy as both anode and cathode materials. The system requires a cell voltage of 1.65 V to reach the 10 mA cm-2 current density for overall water splitting and maintains good stability for 25 h. The efficient electrocatalytic performance of the Ni8Fe2 alloy is owing to the unique porous microstructure, increased active sites and accelerated charge transfer. Consequently, the reaction kinetics of OER are significantly promoted.
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