Cathode electrode coating of sodium hypochlorite generator

Abstract

The invention relates to a cathode electrode coating of a sodium hypochlorite generator. The cathode electrode coating comprises an electrode substrate, electric catalyzing layers, interlayers and transitional layers. The structure sequentially comprises the first electric catalyzing layer, the first interlayer, the first transitional layer, the electrode substrate, the second transitional layer, the second interlayer and the second electric catalyzing layer, wherein the electric catalyzing layers are made of a RuO2-IrO2 material. The roughness of the surface of the electrode substrate is large, the electrode substrate is high in electrocatalytic activity and has excellent corrosion resistance and oxidation resistance under the alkaline environment, the electrolytic efficiency is high, and oxidation is not prone to occurring. The hydrogen evolution potential of the electrode substrate is extremely low, the related electrochemical kinetic parameters before operation are kept after long-term operation, the stability is good, the service life is long, and the catalyzing cost is low. By adopting the RuO2-IrO2 electric catalyzing layers with the certain ratio, the hydrogen evolution activity is further optimized. By introducing the PdO transitional layers, binding force of every two adjacent layers is reinforced, and the active component reduction negative influence caused by falling-off is also eliminated.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry and relates to a cathode electrode coating, in particular to a cathode electrode coating of a sodium hypochlorite generator. Background technique [0002] Sodium hypochlorite generator is a kind of water treatment disinfection and sterilization equipment. The equipment uses salt water as raw material and generates sodium hypochlorite through electrolytic reaction. The sodium hypochlorite cathode is installed in the electrolytic cell together with the corresponding anode plate. After the current is applied, the main reaction is that the reduction reaction occurs at the cathode to generate hydrogen, and the oxidation reaction at the anode generates chlorine gas. During this period, side reactions inevitably occur, and the reduction reaction of ClO- at the cathode is converted into Cl-. The final product required by the sodium hypochlorite generator is ClO-, the higher the concentration, th...

AI Technical Summary

Problems solved by technology

The electrolysis efficiency of the cathode plate electrode in the prior art is not high, resulting in high cost of electrolysis and easy oxidation

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