J. Mater. Sci. Technol. ›› 2023, Vol. 159: 33-40.DOI: 10.1016/j.jmst.2023.02.050

• Research Article • Previous Articles     Next Articles

Bifunctional hierarchical NiCoP@FeNi LDH nanosheet array electrocatalyst for industrial-scale high-current-density water splitting

Liming Yanga, Tao Yanga,*, Enhui Wanga, Xiangtao Yua, Kang Wanga, Zhentao Dub, Sheng Caob, Kuo-Chih Choua, Xinmei Houa,*   

  1. aInstitute for Carbon Neutrality, University of Science and Technology Beijing, Beijing 100083, China;
    bMOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning 530004, China
  • Received:2022-12-26 Revised:2023-02-08 Accepted:2023-02-16 Published:2023-10-01 Online:2023-04-12
  • Contact: *E-mail addresses: . yangtaoustb@ustb.edu.cn (T. Yang), houxinmeiustb@ustb.edu.cn (X. Hou)

Abstract: Aiming to design and prepare non-noble metal electrocatalysts for hydrogen production at high current density (HCD), NiCoP@FeNi LDH hierarchical nanosheets were deposited on nickel foam progressively using a hydrothermal-phosphorization-electrodeposition process. For hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), NiCoP@FeNi LDH/NF requires only 195 and 230 mV overpotentials to reach 1000 mA cm-2, respectively. For overall water splitting, only 1.70 V is required at 1000 mA cm-2. This is the largest value for non-noble metal-based electrocatalysts reported so far at HCD. The hierarchical structure exhibits good electron transport capability and the porous-macroporous structure enhances the gas release rate, resulting in enhanced hydrogen production at HCD. Especially, the synergistic effect of NiCoP and FeNi LDH contributes to the adsorption-desorption equilibrium of intermediate radicals during the reaction process and ultimately enhances the catalytic activity. This work provides useful direction for industrial-scale hydrogen production applications at HCD.

Key words: High-current-density, Overall water splitting, Hydrogen evolution reaction, Oxygen evolution reaction