PEM electrolyzed water membrane electrode based on modified Nafion ionomer and preparation method of PEM electrolyzed water membrane electrode
By doping the Nafion ionomer, introducing CF3(CF2)nCH2OH small molecules to form modified Nafion ionomers, the problem of poor stability of the catalyst under acidic conditions is solved, and the stability of the catalyst and the overall performance of the PEM electrolytic system are significantly improved.
CN119798892AActive Publication Date: 2025-04-11FUDAN UNIVERSITY
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Patent Information
- Application Number
- CN202411888473.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2044-12-20
AI Technical Summary
Technical Problem
In the existing PEM electrolytic system, it is difficult for the catalyst to maintain stability under acidic conditions, which limits the selection of catalysts and the stability of the system.
Method used
By doping commercial Nafion ionomers, CF3(CF2)nCH2OH small molecules are introduced to form modified Nafion ionomers (FOHn-Nafion) to optimize water channels and hydrogen bonded water networks and enhance the stability of the catalyst.
Benefits of technology
Modified Nafion ionomers significantly improve the stability of the catalyst. Especially under high current density conditions, the stability of the tricobalt tetroxide catalyst is increased by 10 times, the voltage is reduced, and the system performance is optimized.
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Abstract
The invention belongs to the technical field of energy materials, and particularly relates to a PEM electrolyzed water membrane electrode based on a modified Nafion ionomer and a preparation method of the PEM electrolyzed water membrane electrode. The modified Nafion ionomer provided by the invention is obtained by carrying out doping modification on a Nafion ionomer or a solid film, the modified Nafion ionomer is marked as FOHn-Nafion ionomer, and a doping agent is CF3 (CF2) nCH2OH; according to the invention, a Nafion solution is modified by heating and stirring, and a Nafion membrane is modified by an impregnation method; the modified ionomer and an anode catalyst are prepared into slurry, the slurry is sprayed to prepare a membrane electrode, and compared with original Nafion, the modified ionomer has better stability; the stability and the use value of a non-noble metal catalyst membrane electrode are effectively improved, and a noble metal catalyst is expected to be replaced, so that the application cost of PEM is reduced. In a PEM test, the voltage is 1.84 V under the current density of 1A cm <-2 >, good stability is kept, and the voltage is 10 times of the original voltage when the battery stably operates for 40 hours. The modification method is simple and suitable for mass production.
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