A brief introduction to the main structure of the electrolyzer stack

Release time:

Aug 25,2021

The electrolyzer stack is composed of a stack body, an anode and a cathode separated by a membrane. According to the different electrolyte, it is divided into three categories: aqueous electrolyzer stack, molten salt electrolyzer stack and non-aqueous electrolyzer stack. When direct current passes through the electrolyzer stack, oxidation reaction occurs at the interface between the anode and the solution, and reduction reaction occurs at the interface between the cathode and the solution to produce the desired product.

The electrolyzer stack is composed of a stack body, an anode and a cathode separated by a membrane. According to the different electrolyte, it is divided into three categories: aqueous electrolyzer stack, molten salt electrolyzer stack and non-aqueous electrolyzer stack. When direct current passes through the electrolyzer stack, oxidation reaction occurs at the interface between the anode and the solution, and reduction reaction occurs at the interface between the cathode and the solution to produce the desired product.

 

The optimization design of the electrolyzer stack structure and the reasonable selection of electrode and membrane materials are the keys to improve the current efficiency, reduce the cell voltage and save energy consumption. In the molten salt electrolyzer stack, the electrolysis temperature is much higher than that of the aqueous solution electrolyzer stack, and the requirements for the anode material are stricter. The electrolytic molten sodium hydroxide is generally available in steel, nickel and its alloys. Electrolytic molten chloride, only graphite.

 

When a metal or alloy is used as a cathode, because it works at a relatively negative potential, it can often play a cathodic protection role and is less corrosive, so the cathode material is easier to choose. In the aqueous solution electrolyzer stack, the cathode generally produces hydrogen evolution reaction, and the overpotential is high.

 

Therefore, the main improvement direction of cathode materials is to reduce the overpotential of hydrogen evolution. In addition to the use of sulfuric acid as the electrolyte must use lead or graphite as the cathode, low carbon steel is commonly used cathode materials. In order to reduce power consumption, various methods are currently used to prepare cathodes with high specific surface area and catalytic activity, such as porous nickel-plated cathodes.

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