Membrane electrode is the place where the electrochemical reaction takes place in PEMFC. It is the medium to transfer electrons and protons. It provides a channel for the reaction gas, tail gas and liquid water. Membrane electrode is the heart of PEMFC.

The membrane electrode is usually composed of five parts, namely, the proton exchange membrane in the middle, the anode and cathode catalytic layers on both sides, the outermost anode gas diffusion layer and cathode gas diffusion layer.

Membrane electrode technology has experienced three generations of development, which can be generally divided into three types: hot pressing method, CCM (catalyst coating membrane) method and ordered membrane electrode. At present, most manufacturers choose the second generation CCM three in one membrane electrode technology, and the ordered membrane electrode is the current process development trend.

The ordered membrane electrode can take into account the ultra-thin electrode and structure control, has a huge unit volume of reactive area and the novel characteristics of pore structure interpenetrating, can achieve high efficiency three-phase transmission, high Pt utilization, high durability, making it a hot spot in the field of PEMFC, and also the main direction of the next generation of membrane electrode preparation technology.