A Membrane Electrode with Ultralow Oxygen Mass Transfer Resistance

Abstract

The invention discloses a membrane electrode with ultra-low oxygen mass transfer resistance; the membrane electrode includes an anode catalyst layer, a proton exchange membrane and a cathode catalyst layer; the catalyst in the cathode catalyst layer is modified with negative charges, and the cathode catalyst layer Also doped with negatively charged carbon supports. The invention modifies the carbon carrier of the cathode catalytic layer in the membrane electrode with negative charges, so as to optimize the distribution of the ionomer and achieve the purpose of reducing the oxygen mass transfer resistance in the cathode catalytic layer. In addition, the local oxygen concentration near the active sites is enhanced by doping an appropriate amount of negatively charged carbon supports. In a word, by modifying the negative charge and doping the negative charge carbon carrier, the local mass transfer resistance in the electrode can be optimized to improve the performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a membrane electrode with ultra-low oxygen mass transfer resistance. Background technique [0002] The membrane electrode composed of cathode, anode and proton exchange membrane is an important part of proton exchange membrane fuel cell. In the cathode catalyst layer, the ionic polymer Nafion and the catalyst form a porous structure, oxygen passes through the pores and the Nafion layer, and reacts on the platinum surface. Therefore, reducing the mass transfer resistance of oxygen in the cathode catalytic layer can reduce the amount of catalyst platinum and thus reduce production costs. At present, platinum catalysts used in proton exchange membrane fuel cells usually use carbon materials as supports, and different catalyst carbon supports will affect the mass transfer resistance of the catalytic layer. At present, the commonly used common carbon supports have positive charge...

AI Technical Summary

Problems solved by technology

At present, platinum catalysts used in proton exchange membrane fuel cells usually use carbon materials as supports, and different catalyst carbon supports will affect the mass transfer resistance of the catalytic layer

At present, the commonly used common carbon supports have positive charges on the surface, and the local mass transfer resistance is about 16s cm Pt -1 , so that the mass transfer polarization loss of the battery is relatively serious

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