Hefei Sinopower Technologies Co., Ltd
What are the principles of pem electrolyzer
The main structure of pem electrolyzer is similar to fuel cell stack, which is divided into membrane electrode, electrode plate and gas diffusion layer. The anode of the PEM electrolytic cell is in a strongly acidic environment (pH≈2) and the electrolysis voltage is 1.4~2.0 V. Most non-precious metals will corrode and may combine with the sulfonate ions in the PEM electrolytic cell, thereby reducing the ability of the PEM to conduct protons.
The electrocatalyst research of pem electrolyzer is mainly about Ir, Ru and other noble metals/oxides and their binary and ternary alloys/mixed oxides, supported catalysts with titanium material as carrier. The current anode iridium catalyst loading is on the order of 1 mg/cm2, and the Pt loading of the cathode Pt/C catalyst is about 0.4-0.6 mg/cm2.
The anode of PEM electrolysis water needs to be resistant to acid environment corrosion, high potential corrosion resistance, and should have a suitable hole structure for the passage of gas and water. Limited by the reaction conditions of PEM water electrolysis, membrane electrode materials (such as carbon materials) commonly used in PEM fuel cells cannot be used for water electrolysis anodes.
1) Customizable pem electrolyzer China uses a proton exchange membrane to isolate the gas on both sides of the electrode, avoiding the disadvantage of easy gas permeation of the alkaline electrolytic hydrogen production diaphragm. (2) The equipment mainly includes Customizable pem electrolyzer China and BOP; (3) The current cost is relatively high.
Hydrogen production by electrolysis of water in pem electrolytic cell means that the DC power supply enters the electrolytic cell filled with electrolyte solution, and the water produces electrochemical reaction on the metal electrode, which can be decomposed into hydrogen and oxygen, and the whole process can complete zero emission. In the overall production chain, the pem electrolyzer is the main medium of the facility.
The distance between the cathode and anode of alkaline electrolyzers in China is one of the important factors affecting the cell voltage. As the electrode spacing increases, the ohmic voltage drop in the slot increases, and the slot voltage increases.