What is the most promising method of hydrogen production?

Hydrogen production by solar electrolysis of water and solar thermochemical cycle.

The hydrogen production system using solar energy includes photolysis hydrogen production, solar power generation and electrolysis water combined hydrogen production system. Hydrogen production from solar energy has been developed in recent 30 ~ 40 years. The research of solar hydrogen production mainly focuses on the following technologies: thermochemical hydrogen production, photoelectrochemical hydrogen production, photocatalytic hydrogen production, artificial photosynthesis hydrogen production and biological hydrogen production.

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Solar hydrogen production system includes photolysis hydrogen production, solar power generation and electrolytic water combined hydrogen production system.

In traditional hydrogen production methods, the hydrogen produced by fossil fuels accounts for more than 90% of the world's total. Hydrogen production from fossil fuels mainly uses steam reforming and pressure swing adsorption to produce high purity hydrogen. Hydrogen production from electric energy electrolysis of water also accounts for a certain proportion. Hydrogen production from solar energy has been developed in recent 30 ~ 40 years. The research of solar hydrogen production mainly focuses on the following technologies: thermochemical hydrogen production, photoelectrochemical hydrogen production, photocatalytic hydrogen production, artificial photosynthesis hydrogen production and biological hydrogen production.