Preparation method of novel catalyst coated film (CCM) functional layer

By spraying SiO2 and Nafion solution onto the cathode and anode surfaces of the proton exchange membrane to form an enhanced functional layer, the problem of insufficient proton transport in proton exchange membrane fuel cells under low humidity conditions is solved, achieving performance improvement and cost reduction.

CN122177854APending Publication Date: 2026-06-09SHANGHAI JIAOTONG UNIV
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Patent Information

Application Number
CN202610159105.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-04
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing proton exchange membrane fuel cells have insufficient proton transport performance under low humidity conditions, leading to performance degradation and increased production costs.

Method used

A solution of SiO2 and Nafion was prepared and an enhanced functional layer was formed on the cathode and anode surfaces of the proton exchange membrane using ultrasonic spraying technology. Combined with catalyst slurry spraying, a layered structure was formed to improve the water retention capacity and proton transport performance of the membrane electrode.

Benefits of technology

Under low humidity conditions, proton transport performance is significantly improved, peak power density is increased, catalyst utilization is increased, total Pt loading is reduced, and production costs are reduced.

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Abstract

The invention discloses a preparation method of a novel catalyst coated film (CCM) functional layer, and belongs to the technical field of proton exchange membrane fuel cell (PEMFC) membrane electrode assembly (MEA), and the preparation method comprises the following steps: S1, SiO2 with nominal BET of 150m < 2 > / g and 20wt% Nafion solution are prepared into a solution, the solvent of the prepared solution is a mixed solution of isopropanol and water, and the mass ratio of Nafion to oxide is 1; s2, carrying out ball milling on the slurry for 14 hours and carrying out ultrasonic treatment for 30 minutes to remove agglomeration; s3, spraying the SiO2 / Nafion slurry on the surface of the PEM cathode / anode by using an ultrasonic spraying instrument; s4, spraying catalyst slurry with the I / C ratio of 0.6 to the surface of the PEM cathode / anode added with the enhanced functional layer by using an ultrasonic spraying instrument; and S5, performing press fitting with conventional MPL, GDL, a sealing ring, a runner, a bipolar plate, an insulating plate and a clamp, and having no extra sealing requirement. By adding the functional layer, the water retention capacity of the membrane electrode is remarkably improved, so that the membrane electrode can still keep excellent proton conduction and output high power under a low-humidity working condition.
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