Cobalt manganese oxide catalyst-nonporous anion exchange membrane composite system stable in high-temperature alkaline environment

Through the covalent bonding interface design of cobalt manganese oxide nanosheets and quaternized poly (arylene ether nitrile) non-porous membrane, the stability problem of the catalyst in high temperature and strong alkaline environment was solved, and efficient water electrolysis hydrogen production performance and long-cycle operation were achieved, reducing costs.

CN120738705APending Publication Date: 2025-10-03BEIJING YINENG HYDROGEN SOURCE TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202510947378.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-10
Publication Date
2025-10-03

AI Technical Summary

Technical Problem

In existing alkaline water electrolysis technology, cobalt manganese oxide catalysts are prone to lattice oxygen loss and metal dissolution in high-temperature, strong alkaline environments, and have weak binding forces with anion exchange membranes, resulting in poor stability of the composite system and an inability to meet the needs of long-term industrial operation.

Method used

Cobalt manganese oxide nanosheets and quaternized poly (arylene ether nitrile) non-porous membranes are polymerized in situ to form a covalently bonded interface with a bonding strength greater than 5MPa. The hydroxyl groups on the catalyst surface form -COC- covalent bonds with the epoxy groups of the membrane segments. A non-porous membrane is prepared by acid etching to regulate oxygen vacancies and non-solvent induced phase separation, forming a composite system with high conductivity and anti-swelling properties.

Benefits of technology

Under high-temperature alkaline environment, the interfacial bonding strength between the catalyst and the membrane is improved, the dissolution rate of cobalt ions is reduced, the membrane swelling rate is reduced, the electrochemical performance is stable, the overpotential is reduced, and the efficiency of hydrogen production by electrolysis of water is improved, making it suitable for industrial applications.

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Abstract

The invention relates to the related field of alkaline water electrolysis hydrogen production, in particular to a cobalt manganese oxide catalyst-nonporous anion exchange membrane composite system stable in high-temperature alkaline environment, which comprises a cobalt manganese oxide nanosheet and a quaternized polyarylene ether nitrile nonporous membrane, the metal molar ratio of Co to Mn of the cobalt manganese oxide is 1: 1-3: 1, and the metal molar ratio of the cobalt manganese oxide nanosheet to the quaternized polyarylene ether nitrile nonporous membrane is 1: 1-3: 1. After acid etching, the oxygen vacancy concentration is 0.2-0.5 mmol / g, and the specific surface area is 120-180m < 2 > / g; the quaternization degree of the non-porous membrane is 70-90%, the conductivity at 80 DEG C is greater than or equal to 100mS / cm, and the swelling rate in 10MKOH is 1t; 5%. According to oxygen vacancies (0.2-0.5 mmol / g) and high specific surface area (120-180 m < 2 > / g) formed after cobalt manganese oxide in the composite system is subjected to acid etching, the number of catalytic active sites is remarkably increased, an electronic structure (for example, the ratio of Co < 3 + > is increased) is optimized, the OER overpotential is as low as 210-230 mV under 10 mA / cm < 2 >, the Tafel slope is smaller than or equal to 38 mV / dec, and the charge transfer resistance is smaller than or equal to 20 omega, which are far superior to those of an unetched catalyst and a traditional system; and the water electrolysis oxygen evolution reaction rate is accelerated.
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