无机材料学报 ›› 2024, Vol. 39 ›› Issue (4): 374-382.DOI: 10.15541/jim20230432

• 研究论文 • 上一篇    下一篇

镍铁氢氧化物-磷化钴复合电极电催化分解水研究

杨博1,2,3(), 吕功煊1(), 马建泰3   

  1. 1.中国科学院 兰州化学物理研究所, 羰基合成与选择氧化国家重点实验室, 兰州 730000
    2.中国科学院大学, 北京 100049
    3.兰州大学 化学化工学院, 兰州 730000
  • 收稿日期:2023-09-22 修回日期:2023-11-23 出版日期:2024-04-20 网络出版日期:2023-12-04
  • 通讯作者: 吕功煊, 教授. E-mail: gxlu@lzb.ac.cn
  • 作者简介:杨 博(1989-), 男, 博士研究生. E-mail: yangbo18@licp.cas.cn
  • 基金资助:
    国家重点研发计划(2022YFB3803600);国家自然科学基金(22272189);国家自然科学基金(22102200)

Electrocatalytic Water Splitting over Nickel Iron Hydroxide-cobalt Phosphide Composite Electrode

YANG Bo1,2,3(), LÜ Gongxuan1(), MA Jiantai3   

  1. 1. State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
  • Received:2023-09-22 Revised:2023-11-23 Published:2024-04-20 Online:2023-12-04
  • Contact: LÜ Gongxuan, professor. E-mail: gxlu@lzb.ac.cn
  • About author:YANG Bo (1989–), male, PhD candidate. E-mail: yangbo18@licp.cas.cn
  • Supported by:
    National Key R&D Program of China(2022YFB3803600);National Natural Science Foundation of China(22272189);National Natural Science Foundation of China(22102200)

摘要:

本研究采用水热-磷化-电化学沉积法在磷化钴表面构筑了金属氢氧化物层, 制备了NiFeOH/CoP/NF复合电极, 考察了复合电极电解水制氢的性能。在1.0 molּ/L的KOH介质中, NiFeOH/CoP/NF复合电极表现出良好的催化电解水性能。在电流密度为100 mA/cm2时, NiFeOH/CoP/NF复合电极电催化析氢(HER)和析氧反应(OER)所需的过电势分别为141和372 mV。在电流密度为10 mA/cm2时, NiFeOH/CoP/NF同时用作阴极和阳极电解水所需电压仅为1.61 V。NiFeOH保护层增强了CoP在电解水反应中的活性和稳定性, NiFeOH/CoP/NF复合电极在恒电流电解中表现出高的HER和OER稳定性, 活性可维持60000 s, 性能未见明显衰减。将NiFeOH/CoP/NF两电极电解池与GaAs太阳能电池组成光伏-电解水系统, 该系统在100 mW/cm2模拟光照条件下, 太阳能至氢能转化效率达到18.0%, 并可稳定运行200 h。

关键词: 磷化钴, 金属氢氧化物保护层, 电催化水分解, 稳定性

Abstract:

NiFeOH/CoP/NF composite electrode was fabricated by constructing a metal hydroxide layer on the surface of cobalt phosphide via hydrothermal, phosphating, and electrodeposition methods. The electrolytic water splitting to hydrogen performance by as-prepared electrode was investigated in 1.0 mol/L KOH medium. NiFeOH/CoP/NF composite electrode exhibited excellent water electrolysis performance, and the required overpotentials for HER and OER at 100 mA/cm2 current density were 141 and 372 mV, respectively. When NiFeOH/CoP/NF electrode served as both cathode and anode for water splitting, only 1.61 V voltage was required to reach current density of 10 mA/cm2. Because NiFeOH protection layer enhanced the electrocatalytic activity and stability of CoP for water splitting, NiFeOH/CoP/NF composite electrode exhibited high stability during the galvanostatic electrolysis in the HER and OER, and its activity could maintain 60000 s without significant performance degradation. The photovoltaic-electrolytic water cell constructed with two NiFeOH/CoP/NF electrodes and GaAs solar cell showed 18.0% efficiency of solar to hydrogen under 100 mW/cm2 simulated solar irradiation and worked stably for 200 h.

Key words: cobalt phosphide, metal hydroxide protection layer, electrocatalytic water splitting, stability

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