Oxygen evolution reaction catalyst

A high surface area iridium-tantalum oxide catalyst with a rutile-type structure addresses stability issues in fuel cells, improving activity and reducing carbon corrosion in membrane electrode assemblies.

JP7888629B2Active Publication Date: 2026-07-13JOHNSON MATTHEY HYDROGEN TECH LTD
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Patent Information

Application Number
JP2023578080
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-07-21
Filing Date
2022-07-20
Publication Date
2026-07-13
Estimated Expiration
2042-07-20

AI Technical Summary

Technical Problem

Existing oxygen evolution reaction catalysts in fuel cells lack stability during repeated inversion events and do not effectively improve the performance of membrane electrode assemblies.

Method used

A high surface area oxygen evolution reaction catalyst composed of iridium and tantalum oxide with a rutile-type crystal structure and specific atomic composition is developed, enhancing the catalyst's activity and stability by controlling the calcination process.

Benefits of technology

The catalyst improves the activity and stability of fuel cell membrane electrode assemblies, reducing carbon corrosion and maintaining performance during repeated inversion events.

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Patent Text Reader

Abstract

The present invention provides an oxygen generation reaction catalyst, the oxygen generation reaction catalyst being an oxide material including iridium and tantalum, the oxygen generation reaction catalyst comprising a crystalline oxide phase having a rutile crystal structure, the crystalline oxide phase having a lattice constant a greater than 4.510 Å, the oxygen generation reaction catalyst having a lattice constant a of at least 50 m 2 The present invention provides an oxygen evolution reaction catalyst having a BET surface area of ​​1.0 to 1.5 nm / g.
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Citation Information

Patent Citations

  • Catalysts for fuel cells

    JP2014510993A