Ir-based grain boundary catalyst, preparation method thereof and proton exchange membrane electrolytic cell containing Ir-based grain boundary catalyst

By constructing Ir-based nanotube catalysts with amorphous junctions of IrOx oxide rich in grain boundaries, the problem of insufficient activity and stability of Ir-based catalysts in acidic water electrolysis was solved, achieving improved catalytic performance with high activity and high stability, making them suitable for industrial applications.

CN120866877APending Publication Date: 2025-10-31TOYOTA JIDOSHA KK +1
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Patent Information

Application Number
CN202410535657.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-04-30
Publication Date
2025-10-31

AI Technical Summary

Technical Problem

Existing Ir-based catalysts suffer from low activity and insufficient stability in anodic oxygen evolution reactions, especially under acidic conditions where it is difficult to achieve both high activity and high stability.

Method used

Ir-based nanotube catalysts with amorphous IrOx oxide boundaries rich in grain boundaries were constructed by wet chemical synthesis. The strong adsorption and desorption capabilities of grain boundaries were utilized to form local amorphous IrOx species, thereby improving the reversible recovery capability of the catalyst.

Benefits of technology

This study achieved a reduction in overpotential, improved quality activity, enhanced stability, and reduced cost for Ir-based catalysts in the acidic water electrolysis oxygen evolution reaction, making them suitable for industrial applications.

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Abstract

The invention relates to an Ir-based grain boundary catalyst, a preparation method thereof and a proton exchange membrane electrolytic cell containing the Ir-based grain boundary catalyst. The Ir-based grain boundary catalyst with the surface rich in a large number of grain boundaries is successfully synthesized through a wet chemical synthesis method, and the catalyst has excellent electrocatalytic activity and stability. Compared with a commercial IrO2 nano-catalyst, amorphous IrOx generated by a large number of grain boundaries has better intrinsic activity, and the purposes of reducing the consumption of precious metal and reducing the cost of the catalyst can be achieved. The preparation method of the catalyst is simple, the quality activity is obviously improved, the stability is high, and the catalyst has potential industrial application prospects.
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