Self-humidifying proton exchange membrane fuel cell membrane electrode with water diffusing area and its preparation

Abstract

A sellf-humidified proton exchange membrane fuel cell membrane electrode with water dispersion area and its preparation, which solves the problem that water produce by existing cathode can not be dispatched timely which may result in cathode water- logged. The said water dispersion area is set at external edge of catalyst layer and placed in the same plane with the catalyst layer, the water dispersion area contacts Nafion membrane. The preparation is that : (1) prepare gas dispersion layer; (2) prepare water dispersion area and cathode catalytic layer; (3) prepare water dispersion area and anod catalytic layer. Because of the water dispersion area structure, the water produced at cathode is easy disperse to external area and move to anod to make the water distribution of the fuel cell more evenly, so that the performance of fuel cell is raised without increasing catalyst loading.

Description

technical field [0001] The invention relates to a proton exchange membrane fuel cell, in particular to a proton exchange membrane fuel cell membrane electrode with a self-humidifying electrode structure. Background technique [0002] In the existing self-breathing and self-humidifying PEMFC, there are three main ways of water migration: one is the diffusion of water from the cathode to the anode due to the concentration difference of water on both sides of the proton exchange membrane or the difference in gas pressure; The migration of water from the anode to the cathode caused by seepage; the third is that the cathode area is discharged from the battery system because the water is evaporated. The advantages of high power density and environmental friendliness of proton exchange membrane fuel cell have made it a research hotspot in recent years. When the proton exchange membrane fuel cell is humidified with hydrogen at the anode and works at a relatively high temperature, t...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the water generated by the cathode of the existing proton exchange membrane fuel cell cannot be dispatched in time, it is easy to cause the cathode to be flooded, and the resistance of proton migration to the membrane increases because the anode reaction gas has not been pre-humidified. A self-humidifying proton exchange membrane fuel cell membrane electrode with a water diffusion zone and its preparation. The specific technical scheme for solving the above problems is as follows:

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