Trace noble metal modified NiMo catalyst, its preparation method and application

By growing micron-sized prismatic molybdenum-nickel alloy microcrystals in situ on the surface of nickel foam and attaching noble metal elements, a bifunctional NiMo catalyst was prepared, which solved the problem of high cost of hydrogen production catalysts for water electrolysis, realized efficient and stable hydrogen production by water electrolysis in seawater, and reduced the amount of noble metals used.

CN118497817BActive Publication Date: 2026-03-20SHENZHEN UNIV
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Patent Information

Application Number
CN202410572181.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-05-10
Publication Date
2026-03-20
Estimated Expiration
2044-05-10

AI Technical Summary

Technical Problem

Existing water electrolysis hydrogen production catalysts are costly and inefficient. In particular, they face the problem of limited precious metal reserves and high prices in seawater electrolysis. Furthermore, the use of precious metals in the anode and cathode catalysts of commercial electrolyzers has limited their large-scale commercial application.

Method used

By modifying NiMo catalysts with trace amounts of noble metals, a bifunctional catalyst was prepared by in-situ growing micron-sized prismatic molybdenum-nickel alloy microcrystals on the surface of nickel foam and attaching noble metals such as osmium, ruthenium, or iridium. This catalyst can be used for anodic and cathodic catalysis and is suitable for alkaline seawater conditions.

Benefits of technology

It achieves ultra-long stability on both the HER and OER sides in alkaline seawater, exceeding 1000 hours, while possessing electrochemical catalytic performance comparable to commercial RuO2 and Pt/C electrodes, reducing the amount of precious metals used and lowering costs.

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Abstract

The application relates to a trace noble metal modified NiMo catalyst and a preparation method and application thereof, relates to a bifunctional molybdenum-nickel-based electrocatalyst, and aims to solve the technical problems of high cost and low efficiency of existing water electrolysis hydrogen production catalysts. The catalyst is micrometer-level square columnar molybdenum-nickel alloy microcrystals in situ grown on a foam nickel substrate, and the surface of the molybdenum-nickel alloy microcrystals is attached with noble metal elemental osmium, ruthenium or iridium. The preparation method comprises the following steps: placing the foam nickel in a mixed solution of nickel nitrate and ammonium molybdate for hydrothermal reaction, then dropping a noble metal salt solution on the surface of the foam nickel, and annealing at high temperature to obtain the trace noble metal modified NiMo catalyst. The catalyst has a HER side overpotential of only 11.6 mV and an OER side overpotential of only 243.8 mV under an electric current density of 10 mAcm ‑2 2 in alkaline seawater. The HER stability in seawater is over 1000 h, the OER stability is over 1000 h, and the catalyst can be used in the field of seawater electrolysis hydrogen production.
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