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Research Article

Coupling Co-Ni phosphides for energy-saving alkaline seawater splitting

Weijia Liu1, Wenxian Liu2( ), Tong Hou1, Junyang Ding1, Zhigui Wang1, Ruilian Yin2, Xingyuan San3( ), Ligang Feng4, Jun Luo5, Xijun Liu1( )
State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
Hebei Key Laboratory of Optic-electronic Information and Materials, the College of Physics Science and Technology, Hebei University, Baoding 071002, China
School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
ShenSi Lab, Shenzhen Institute for Advanced Study, University of Electronic Science and Technology of China, Shenzhen 518110, China
Show Author Information

Graphical Abstract

A heterostructured catalyst comprising CoP and Ni2P on nickel foam is reported for hydrazine oxidation (HzOR)-assisted alkaline seawater splitting and energy-saving small molecule oxidation (glucose oxidation, methanol oxidation, and urea oxidation) reactions in alkaline seawater electrolyte.

Abstract

The coupling of energy-saving small molecule conversion reactions and hydrogen evolution reaction (HER) in seawater electrolytes can reduce the energy consumption of seawater electrolysis and mitigate chlorine corrosion issues. However, the fabrication of efficient multifunctional catalysts for this promising technology is of great challenge. Herein, a heterostructured catalyst comprising CoP and Ni2P on nickel foam (CoP/Ni2P@NF) is reported for hydrazine oxidation (HzOR)-assisted alkaline seawater splitting. The coupling of CoP and Ni2P optimizes the electronic structure of the active sites and endows excellent electrocatalytic performance for HzOR and HER. Impressively, the two-electrode HzOR-assisted alkaline seawater splitting (OHzS) cell based on the CoP/Ni2P@NF required only 0.108 V to deliver 100 mA·cm−2, much lower than 1.695 V for alkaline seawater electrolysis cells. Moreover, the OHzS cell exhibits satisfactory stability over 48 h at a high current density of 500 mA·cm−2. Furthermore, the CoP/Ni2P@NF heterostructured catalyst also efficiently catalyzed glucose oxidation, methanol oxidation, and urea oxidation in alkaline seawater electrolytes. This work paves a path for high-performance heterostructured catalyst preparation for energy-saving seawater electrolysis for H2 production.

Keywords

seawater splittingheterostructureelectrocatalysishydrazine oxidation reactionhydrogen evolution reaction

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Nano Research
Volume 17 Issue 6,
June 2024
Pages 4797-4806
DOI: 10.1007/s12274-024-6433-8
Cite this article:
Liu W, Liu W, Hou T, et al. Coupling Co-Ni phosphides for energy-saving alkaline seawater splitting. Nano Research, 2024, 17(6): 4797-4806. https://doi.org/10.1007/s12274-024-6433-8
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Received: 24 October 2023
Revised: 20 December 2023
Accepted: 21 December 2023
Published: 07 February 2024
© Tsinghua University Press 2024
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