Method for improving activation efficiency of fuel cell

Abstract

The invention provides a method for improving the activation efficiency of a fuel cell. The method comprises the following steps: under a normal operation of the cell, testing a cell polarization curve before activation by a voltage scanning method; carrying out forced discharge treatment on the cell under nitrogen for a cathode instead of air; testing the cell polarization curve by the voltage scanning method; introducing air at a low stoichiometric ratio for constant-voltage activation treatment for twice, and testing each cell polarization curve by the voltage scanning method after each activation treatment; and judging whether activation is finished or not according to the deviation degrees of two polarization curves. The method has the beneficial effects that with quick testing of the cell polarization curves by the voltage scanning method as a characterization method for the cell activation degree, the activation process is controllable; the treatment method employing the nitrogen for the cathode instead of air is beneficial to eliminating surface impurities of a catalyst and opening a closed hole and a semi-closed hole in a catalyst layer; the mass transfer ability is strengthened; and the activation method is simple to operate, short in activation time, low in fuel consumption, high in activation degree and controllable in activation process.

Description

technical field [0001] The invention belongs to the field of fuel cells, in particular to a method for improving the activation efficiency of fuel cells, and is especially suitable for the pretreatment process before the evaluation of the characteristics of membrane electrode assemblies (MEA) and the monitoring of the activation degree of single cells. Background technique [0002] The core part of the proton exchange membrane fuel cell (PEMFC) is the membrane electrode assembly (MEA). After the battery is initially assembled, most of the catalysts in the membrane electrode are in a discrete state, and the catalytic effect of the catalyst in the discrete state is poor. In order to improve the performance of MEA and make full use of the catalyst, MEA needs to be activated. [0003] At the same time, since the catalytic layer of the MEA not only has the function of transporting the reaction gas to the catalyst surface, but also has the function of discharging water, if the re...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for improving the fuel cell activation efficiency and monitoring the activation degree, so as to overcome the shortcomings of the existing activation method that the activation time is long and the activation degree cannot be monitored.

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