Solar fuel

A solar fuel is a synthetic fuel produced using solar energy, through photochemical (i.e. photon activation of certain chemical reactions), photobiological (i.e., artificial photosynthesis), electrochemical (i.e. using solar electricity to drive an endogenic reaction such as hydroelectrolysis), or thermochemical methods (i.e., through the use of solar heat supplied by concentrated solar thermal energy to drive a chemical reaction). Sunlight is the primary energy source, with its radiant energy being transduced to chemical energy stored in bonds, typically by reducing protons to hydrogen, or carbon dioxide to organic compounds.

A solar fuel can be produced and stored for later use, when sunlight is not available, making it an alternative to fossil fuels and batteries. Examples of such fuels are hydrogen, ammonia, and hydrazine. Diverse photocatalysts are being developed to carry these reactions in a sustainable, environmentally friendly way.

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