Development of Hyundai Electrolyzer
The distance between the anode and cathode of the Electrolyzer is one of the important factors that affect the voltage of the Electrolyzer. As the distance between electrodes increases, the ohmic voltage drop of the Electrolyzer increases, and the voltage of the Electrolyzer increases. Especially when working with high current, this voltage loss is more serious.
Hyundai Electrolyzer adopts various measures to reduce the distance between electrodes, such as the use of diffusion anodes and modified diaphragms to make an Electrolyzer structure with zero distance between electrodes. The residence time of the electrolyte in the electrolytic cell not only affects the production capacity of the equipment, but also affects the current efficiency of the electrolysis process in some cases. The chemical reaction between chlorate ions (ClO3) is very slow. If left in the electrolytic cell for a long time, not only will the utilization rate of the electrolytic cell be reduced, but the hypochlorite ions will be oxidized on the anode surface or reduced on the cathode surface, reducing current efficiency . Therefore, modern electrolytic cell designs strive to reduce the volume and allow the electrolyte to flow quickly along the electrodes. If further reaction is needed, a separate chemical reactor can be installed outside the electrolytic cell.
The vertical installation of the electrodes in the electrolytic cell is more compact, the conductive plate is easy to connect, and it is helpful to reduce the bubble effect. Because there are often bubbles on the surface of the electrode where gas is precipitated, it will reduce the working surface area of the electrode. In addition, the solution near the electrode will also be filled with bubbles, increasing the resistance of the solution. This phenomenon is called the "bubble effect". However, near the surface of the vertical electrode, the characteristics of high aeration in the solution, low solution density and fast rise speed can be used to form a natural circulation of the electrolyte, which accelerates the bubbles to leave the electrode surface and reduces the bubble effect. When the vertical electrode is used as a gas electrode, the shape of the electrode is mostly mesh, which not only increases the working surface area, but also facilitates the escape of bubbles.
Electrolyzer materials can be steel, cement, ceramics, etc. Steel is resistant to alkali and is the most widely used. For the corrosive electrolyte, the steel tank is lined with lead, synthetic resin or rubber. At present, the electrolyzer is developing in the direction of large capacity and low energy consumption. Bipolar electrolyzers are suitable for large-scale production and have been successively adopted by the water electrolysis and chlor-alkali industries.
Circulation Water Electrolyzer Treatment mostly uses a series electrolyzer with iron as the cathode surface and nickel as the anode surface to electrolyze the aqueous solution of caustic potash or caustic soda. Oxygen gas is emitted from the anode and hydrogen gas is emitted from the cathode. This method has high cost, but the product has high purity, and can directly produce hydrogen.