Explanation

Porous electrodes that allow gas to pass in and out through diffusion. These holes are channels for gas diffusion. The gas diffusion electrode is composed of a catalyst layer and a gas diffusion medium. The latter is the support of the former. In proton exchange membrane fuel cell, the gas diffusion medium is mostly carbon paper. Its porosity can reach up to 90%, and the porosity of the catalyst layer is generally above 30%, containing primary pores and secondary pores- The sizes of primary and secondary pores are in the white range of lOfim and 100pm, respectively. See gas diffusion medium for gas diffusion medium.

Classification