How is green hydrogen produced?
Hydrogen is mainly present in water and fossil fuels in the form of compounds on the earth, and hydrogen energy, as a secondary energy source, needs to be "extracted" through hydrogen production technology. The main source of hydrogen in my country is the production of hydrogen from fossil fuels. The hydrogen produced in this way is called "grey hydrogen" or "blue hydrogen" (purity).
And green hydrogen, specifically refers to hydrogen produced by using renewable energy (such as solar energy, wind energy, nuclear energy, etc.), it can achieve no carbon emission in the whole production cycle, and it is of great significance to reduce greenhouse gas emissions!
One of the important ways to produce green hydrogen is to electrolyze water to produce hydrogen.
Electrolysis is a well-known chemical process: water produces hydrogen and oxygen in an electrolyzer. Due to the extremely poor "conducting" ability of pure water, a suitable proportion of electrolyte will be added to the water to help improve the electrolysis efficiency.
Alkaline water electrolysis hydrogen production surrounded by hydrogen energy refers to the process of water electrolysis hydrogen production carried out in an alkaline electrolyte environment.
positive oxygen negative hydrogen
Under the action of direct current, the electrons of the positive electrode will "run" to the negative electrode, and the water and electrons near the negative electrode will undergo a hydrogen evolution reduction reaction to generate hydrogen and hydroxide ions; the hydroxide ions will pass through the diaphragm and "run" to the vicinity of the positive electrode. Loss of electrons, the oxygen evolution oxidation reaction occurs, and water and oxygen are generated.