There are various advantages of using alkaline electrolyzer in water electrolysis hydrogen production equipment, including simple structure, convenient operation and relatively cheap price, especially suitable for some large-scale hydrogen production places, but its disadvantages are also obvious, among which low efficiency makes users headache. In order to understand the disadvantages of alkaline electrolyzer in water electrolysis hydrogen production equipment, researchers developed polymer thin film The difference between PEM cell and other cells is that PEM cell is based on ion exchange technology.
The PEM electrolyzer of water electrolysis hydrogen production equipment has two electrodes in the same structure as all electrolyzers, but with polymer film, the proton exchange membrane and the electrode catalyst usually form an integrated structure. The electrode with porous platinum as catalyst structure is close to the surface of exchange membrane. The film of PEM cell is composed of nation, which contains a kind of material called so midship. After water decomposes into hydrogen and oxygen, S0 will rapidly decompose into SiO3 and h, and H and water molecules combine into ho +, under the action of electric field, it will pass through the film to the cathode, and hydrogen will be generated at the cathode.
The PEM cell of water electrolysis hydrogen production equipment needs no electrolyte, only pure water, which is safer and more reliable than the alkaline cell. Using proton exchange membrane as electrolyte has the advantages of chemical stability, high proton conductivity and good gas separation. Because of the high proton conductivity, PEM cell can work under high current, thus increasing the efficiency of electrolysis. Because of the thin proton exchange membrane, the ohmic loss is reduced and the efficiency of the system is improved. At present, the efficiency of PEM cell can reach 85% or more, but because platinum and other precious metals are used at the electrode, Nafion is also very expensive material, so it is difficult to put PEM cell into large-scale use. In order to further reduce the cost, the current research focuses on how to reduce the use of precious metals in electrodes and find other proton exchange membrane materials. Organic materials, such as poly and inorganic materials, such as SPS, have been proved to have similar characteristics with nation by experiments, but the cost is lower than on, so they can be considered as PEM cell proton exchange membrane. With the further research, it is possible to find a more suitable proton exchange membrane, and with the reduction of the precious metal content of the electrode, the cost of PEM cell will be greatly reduced, becoming one of the main hydrogen production devices.
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