Self-humidifying membrane electrode of proton exchange membrane fuel cell and preparation method for self-humidifying membrane electrode

Abstract

The invention discloses a self-humidifying membrane electrode of a proton exchange membrane fuel cell and a preparation method for the self-humidifying membrane electrode. The membrane electrode comprises a proton exchange membrane, an anode catalyst layer, a cathode catalyst layer and two gas diffusion layers, wherein the anode catalyst layer and the cathode catalyst layer are arranged on the two sides of the proton exchange membrane, or the anode catalyst layer and the cathode catalyst layer are arranged on the two gas diffusion layers respectively; the anode catalyst layer is prepared by the steps of mixing an inorganic oxide hydrolysis precursor, an organic solvent and water, and carrying out hydrolysis on the mixture by an acid solution to obtain acid sol; uniformly mixing a catalyst, a perfluorosulfonic acid resin solution and an organic solvent to obtain catalyst slurry; mixing the catalyst slurry with the acid sol, adding an alkali solution and forming a hydrophilic inorganic oxide in an in-situ reaction manner to obtain inorganic oxide turbid liquid; and spraying the inorganic oxide turbid liquid on one side of the proton exchange membrane or the gas diffusion layers to form the anode catalyst layer. The membrane electrode is simple in preparation, and the water retention capability is greatly improved, so that the normal operation of the fuel cell is ensured under a non-humidifying condition.

Description

technical field [0001] The invention belongs to the technical field of proton exchange membrane fuel cells, and in particular relates to a self-humidifying proton exchange membrane fuel cell membrane electrode and a preparation method thereof. Background technique [0002] A fuel cell is a device that converts chemical energy directly into electrical energy. Among them, the proton exchange membrane fuel cell has the advantages of low starting temperature, high energy conversion efficiency, high energy density and no pollutant emission, and is considered to be an ideal power source for future portable power sources and electric vehicles. [0003] Membrane electrodes are the core components of proton exchange membrane fuel cells, usually composed of proton exchange membrane, anode catalyst, cathode catalyst, cathode diffusion layer and anode diffusion layer. The proton exchange membrane needs to ensure good wettability in order to have good proton conductivity in the working ...

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Problems solved by technology

[0004] Although water is also produced during the working process of proton exchange membrane fuel cells, due to the poor water retention capacity of the current conventional membrane electrode structure, the gas must be humidified to ensure the normal operation of the stack. However, whether it is internal humidification or external humidification Humidification method requires the use of humidification auxiliary devices, which will significantly increase the cost, mass and volume of the battery system, resulting in a decrease in the volume and mass specific power of the stack

[0005] Self-humidification technology is the mainstream of current research, but the current self-humidification technology is mostly to directly add hydrophilic powder or organic matter such as perfluorosulfonic acid resin to the catalytic layer, which has poor dispersion uniformity and poor self-humidification effect. Difference

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