Hydrogen economy is a future economic structure of energy using hydrogen as a medium, which was put forward in the 1970s.

Hydrogen energy, regarded as the clean energy with the most development potential in the 21st century. It has diverse sources, can achieve zero emission at the terminal, is environmentally friendly, and has a wide range of applications.

Hydrogen energy is recognized as the most promising secondary energy in the 21st century. It has the advantages of clean, low carbon, high calorific value, and high conversion rate. In the context of carbon-neutral, the energy structure of many countries will gradually transit from a fossil energy focus to a clean energy society.

Hydrogen, as one of the world's most environmentally friendly energy sources, is slowly being integrated into human society. At present, the global annual output of hydrogen is about 70 million tons, and the market size is about 100 billion U.S. dollars.

"Green hydrogen", which utilizes renewable energy and electrolyzer to produce hydrogen, eliminates carbon emissions from the source and makes hydrogen the truly clean energy.