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Working conditions of electrodes in Hydrogen generation of alkaline water electrolysis

  • November 22, 2021
At present, the common raw material for hydrogen production by water electrolysis is alkaline water. The requirements for the production of hydrogen by alkaline water electrolysis are not high, and the use and production technology are mature. The hydrogen produced is of high purity. The investment is mainly concentrated on water. In the electrolytic hydrogen production equipment, there is also a disadvantage, that is, a large amount of power is consumed in the process of producing hydrogen, which can be said to be a constraint condition for alkaline water electrolysis hydrogen production. Let's take a look at the electrodes of alkaline water electrolysis hydrogen production.

The standard for evaluating the quality of alkaline water electrolysis hydrogen production electrodes is from two aspects, namely the service life of the electrode and the power consumption during the work. When the current density is not large during the work, the main reason affecting the power consumption is It is a potential. When the current density becomes larger, the potential and resistance become the key elements of power consumption. In the process of hydrogen production by water electrolysis, the electrodes of the equipment should have the following.

(1) The surface area of the electrode should be large.
(2) High conductivity.
(3) Good electrocatalytic activity.
(4) long-term mechanical and chemical stability.
(5) precipitation of small bubbles.
(6) High selectivity.
(7) Easy to get and low cost.
(8) Security.

In the working process of water electrolysis hydrogen production equipment, high current density is often required, so high conductivity and chemical stability are extremely important. High conductivity can reduce the heat generated during the conductive process and reduce power consumption. It can improve the service life of the electrode, reduce the damage in the process of water electrolysis and hydrogen production, and reduce the production cost.

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