A symmetrical composite electrode, its preparation method and application

A one-pot method was used to prepare a composite electrode of doped cubic lanthanum ferrite-based perovskite and doped cubic fluorite-type cerium oxide. Combined with methanol anode assistance, the problems of oxygen ion transfer hindrance and scarcity of active sites in SOEC were solved, realizing low-energy-consumption and high-efficiency carbon dioxide conversion and energy utilization.

CN119913555BActive Publication Date: 2026-05-26CHINA UNIV OF GEOSCIENCES (WUHAN)
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Patent Information

Application Number
CN202510048192.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-01-13
Publication Date
2026-05-26
Estimated Expiration
2045-01-13

AI Technical Summary

Technical Problem

In traditional solid oxide electrolyzers (SOECs), the high oxygen partial pressure on the anode side hinders oxygen ion transfer, requiring a large amount of electricity and increasing energy costs. Meanwhile, composite cathodes suffer from uneven two-phase distribution and a scarcity of active sites.

Method used

A one-pot self-assembly method was used to prepare doped cubic lanthanum ferrite-based perovskite oxide and doped cubic fluorite cerium oxide. Doped metal nanoparticles were precipitated in situ to form a symmetrical composite electrode. The oxygen partial pressure was reduced by introducing a methanol atmosphere into the anode and carbon dioxide electrolysis was assisted.

Benefits of technology

It reduces the energy consumption of SOEC, improves reaction efficiency, reduces electrode polarization resistance and total electrical energy consumption, enhances the catalytic activity of carbon dioxide reduction reaction, reduces voltage requirements, and provides a new pathway for carbon dioxide conversion and energy utilization.

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Abstract

This invention relates to the field of electrode technology, and more particularly to symmetrical composite electrodes, their preparation methods, and applications. This invention utilizes a one-pot method for self-assembly of doped cubic lanthanum ferrite-based perovskite oxide and doped cubic fluorite-type cerium oxide, followed by in-situ precipitation of doped metal nanoparticles. The chemical formula of the doped cubic lanthanum ferrite-based perovskite is (La... 0.5 Sr 0.5 )[(Fe 0.9 Nb 0.1 ) 1.0‑x M x ]O 3‑δ The chemical formula of doped fluorite-type cerium oxide is Gd. 0.075 Ce 0.925‑y M y O 2‑δ The doped metal nanoparticles are elemental M. When a reducing gas is introduced, the metal nanoparticles M precipitate in situ. This heterogeneous structure of the metal particles is tightly bonded to the composite electrode material, exhibiting good dispersion, and the embedded structure ensures excellent electrode stability. As a symmetrical electrode for SOEC, this invention achieves superior catalytic activity for carbon dioxide reduction and methanol oxidation.
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