In-situ construction method of self-supporting sulfided nickel water-splitting electrode adapting to fluctuating working conditions

By forming a micro-nano scale rough structure on the surface of a nickel substrate and performing low-temperature sulfidation treatment, an in-situ Ni/NiSx gradient interface is constructed, which solves the problems of weak interfacial bonding and insufficient mechanical stability of alkaline water electrolysis electrodes under fluctuating conditions, and achieves electrode performance with high activity and high stability.

CN122105462APending Publication Date: 2026-05-29UNIV OF SCI & TECH BEIJING
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF SCI & TECH BEIJING
Filing Date
2026-03-04
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

When operating under fluctuating renewable energy conditions, the frequent start-stop operations of existing alkaline water electrolysis electrodes cause drastic fluctuations in electrode potential, weak bonding between the catalyst and the substrate interface, poor resistance to reverse current, and insufficient mechanical stability, resulting in rapid degradation of electrode performance.

Method used

A micro-nano-scale rough surface is formed by etching with strong oxidizing acid, followed by sulfidation treatment at low temperature to construct a Ni/NiSx gradient interface in situ, thereby achieving the integration of the catalyst and the substrate and enhancing the interfacial bonding strength and charge transport.

Benefits of technology

It significantly improves the structural integrity and redox reversibility of the electrode under harsh conditions such as reverse current impact, bubble scouring and solution flow, achieving a balance between high activity and high stability, and meeting the requirements for efficient and stable operation of industrial-grade fluctuating water electrolysis systems.

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Abstract

The application discloses a sulfidized nickel self-supporting water-splitting electrode in-situ construction method suitable for fluctuant working conditions and belongs to the technical field of hydrogen production by water electrolysis. x The nickel base material is subjected to surface etching by strong oxidizing acid to form a structure state with a micro-nano scale rough surface, and then is subjected to sulfidation treatment under mild conditions to in-situ construct a Ni / NiS heterojunction with gradient change in composition and structure. The gradient interface can realize catalyst-substrate integration, avoiding problems such as active site shielding, high interface contact resistance and weak bonding force caused by dependence on polymer adhesives in traditional processes. The integrated self-supporting sulfidized nickel electrode provided by the application can realize strong and tough bonding and efficient charge transmission between the catalyst layer and the substrate, thereby significantly improving the structural integrity and redox reversibility of the electrode under severe working conditions such as reverse current impact, bubble scouring and solution flow, and finally realizing the unity of high activity and high stability.
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