The membrane electrode gas diffusion multifunctional electrolytic cell adopts a sandwich structure and is divided into four components: A, B, C, and D. The combination of components is used to meet the electrochemical testing needs of researchers of various types. The $r $nA and C parts have serpentine channels and are made of high-purity titanium. The C part can also be replaced with high-purity nickel $r $nB. The overall cavity is I-shaped, with a thickness of 1.2 mm in the middle. By using the B cavity, the distance between the anode and cathode (A and C) can be controlled within 1.6 mm. The $r $nD section is a reference electrode pipeline accessory