Hefei Sinopower Technologies Co., Ltd
How Hydrogen Production Using Alkaline Electrolyzers Works
Alkaline electrolyzers are the most commonly used, most mature and most economical electrolyzers, and are easy to operate and widely used at present, but the disadvantage is that they have the lowest efficiency.
Alkaline electrolyzer is mainly composed of power supply, electrolyzer box, electrolyte, cathode, anode and diaphragm. The electrolytes are potassium hydroxide solution (KOH) with a concentration of 20% to 30%; the diaphragm is mainly composed of asbestos, which mainly plays the role of separating gas, and the two electrodes are mainly composed of metal alloys.
The main working principle of the alkaline electrolyzer is: at the cathode, water molecules are decomposed into hydrogen ions (H+) and hydroxide ions (OH-), the hydrogen ions get electrons to generate hydrogen atoms, and further generate hydrogen molecules (H2) ; The hydroxide ion (OH-) passes through the porous diaphragm under the action of the electric field force between the cathode and the anode to reach the anode, where it loses electrons to generate a water molecule and an oxygen molecule.
The characteristics of hydrogen production in alkaline electrolyzers are: hydroxide ions (OH-) pass through the porous diaphragm under the action of the electric field force between the cathode and the anode.
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.