磷化物
材料科学
阳极
阴极
分解水
镍
电解水
电解
制氢
化学工程
电极
冶金
氢
电解质
催化作用
化学
生物化学
有机化学
物理化学
光催化
工程类
作者
Qixian Han,Hongmei Wu,Feng Li,Jing Liu,Liping Zhao,Peng Zhang,Lian Gao
出处
期刊:Catalysts
[MDPI AG]
日期:2023-08-26
卷期号:13 (9): 1242-1242
被引量:3
标识
DOI:10.3390/catal13091242
摘要
Electrolytic water splitting is a promising path for the production of clean hydrogen when combined with green electric power, such as photovoltaic and wind power; however, the high current water electrolysis is mainly dependent on the utilization of Pt, Ru, and other expensive materials, while the transition metal-based catalysts still need improvement in electrocatalytic activity and stability. Here, we present the preparation of economic and scalable electrode materials, Nickel-Iron phosphide/Nickel foam (NiFeP/NF), with a hierarchical porous structure for overall water splitting as both the anode and cathode. An overall potential of 1.85 V for the current density of 100 mA cm−2, and a long lifetime of 700 h, were achieved by using NiFeP/NF as both the anode and cathode. The nanostructures of the composite phosphides were investigated and the spent electrode after long-term electrolysis was characterized to investigate the long-term failure mechanism of the phosphides. Surface shedding and reconstruction theories were proposed for the failure of the NiFeP/NF cathode and anode in long-term electrolysis, respectively. Furthermore, TiO2 coating was proved to be an efficient strategy to elongate the lifetime of the phosphide electrodes, which shows a slow current decline rate of 0.49 mA·cm−2 h−1.
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