Electrodeposition synthesis of cobalt-molybdenum bimetallic phosphide on nickel foam for efficient water splitting

Desheng Guo; Lingling Wen; Tiantian Wang; Xin Li

doi:10.1016/j.jcis.2023.09.173

Electrodeposition synthesis of cobalt-molybdenum bimetallic phosphide on nickel foam for efficient water splitting

J Colloid Interface Sci. 2024 Apr:659:707-717. doi: 10.1016/j.jcis.2023.09.173. Epub 2023 Oct 6.

Authors

Desheng Guo¹, Lingling Wen¹, Tiantian Wang¹, Xin Li²

Affiliations

¹ School of Chemistry and Chemical Engineering, State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
² School of Chemistry and Chemical Engineering, State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. Electronic address: lixin@hit.edu.cn.

PMID: 38211488
DOI: 10.1016/j.jcis.2023.09.173

Abstract

A reasonable design of excellent bifunctional catalyst is an effective strategy for large-scale hydrogen production. In this study, a two-stage electrodeposition method was used to prepare a crystalline-amorphous structure cobalt molybdenum phosphide layered particles with different sizes on a nickel foam (NF) substrate. Electron rearrangement at the Co/CoMoP₂@CoMoO₄ heterogeneous interface can reduce the reaction energy barrier for HER and OER, and accelerate the catalytic reaction kinetics. The doping of Mo can promote the synergistic effect between Co and Mo, thereby optimizing the Gibbs free energy of hydrogen adsorption/desorption. This layered arrangement of different size particles greatly improves the active area of the catalyst. In alkaline solution, achieving a current density of 10 mA cm^-2 only required overpotentials of 40 mV for HER and 278 mV for OER, respectively. The cell voltage required for the CoMo-P/NF||CoMo-P/NF electrolytic cell is only 1.53 V at 10 mA cm^-2. This study provides a reference for the rapid, efficient, and environmentally friendly preparation of high-activity water splitting catalysts with large surface areas.

Keywords: Electrodeposition; Heterogeneous interface; Synergistic effect; Transition metal phosphides; Water splitting.