Fuel cell composite cathode material, method of making and use

The composite cathode material formed by combining La5.5W0.45Mo0.4Nb0.15O11.25-δ and Sr2Sc0.1Nb0.1Co1.5Fe0.3O6-δ solves the problems of insufficient CO2 resistance and proton conductivity of existing proton-conducting solid oxide fuel cell cathode materials, and achieves low polarization impedance, good proton absorption and diffusion capabilities, and high power density.

CN115642260BActive Publication Date: 2026-05-01NANJING TECH UNIV
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Patent Information

Application Number
CN202211118743.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-09-13
Publication Date
2026-05-01
Estimated Expiration
2042-09-13

AI Technical Summary

Technical Problem

Existing proton-conducting solid oxide fuel cell cathode materials have shortcomings in terms of CO2 resistance and proton conductivity, especially in terms of surface chemical water adsorption capacity and bulk proton adsorption capacity, which have not met expectations.

Method used

A composite cathode material was formed by combining trace amounts of La5.5W0.45Mo0.4Nb0.15O11.25-δ (LWMN) and Sr2Sc0.1Nb0.1Co1.5Fe0.3O6-δ (SSNCF) and prepared by solid-state method or sol-gel method, which improved the material's CO2 resistance and proton conductivity.

Benefits of technology

Composite cathode materials exhibit low polarization resistance, good proton absorption and diffusion capabilities, improved resistance to CO2 poisoning, and high power density, making them suitable for medium- and low-temperature proton conductor solid oxide fuel cells.

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Abstract

The present application relates to a kind of fuel cell composite cathode material, preparation method and use, specifically is related to a kind of strategy for slightly composite to improve the CO2 resistance and proton conductive capacity of material and its application in proton conductor solid oxide fuel cell cathode, composite cathode material composition molecular formula is La 5.5 W 0.45 Mo 0.4 Nb 0.15 O 11.25‑δ (LWMN)‑Sr2Sc 0.1 Nb 0.1 Co 1.5 Fe 0.3 O 6‑δ (SSNCF).The present application proposes a strategy for improving the CO2 resistance and proton conductive capacity of solid oxide fuel cell cathode, so that the cathode material has excellent proton conductive capacity and CO2 resistance under certain oxygen ion and electronic conductivity, so that the LWMN-SSNCF composite electrode has excellent electrochemical performance on the proton conductor fuel cell, and the maximum output power is up to 1113 mW·cm ‑2 at 650 DEG C.
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