The electricity produced by a solar cell can be used to set off chemical
reactions. If this generates a fuel, then one speaks of solar fuels - a
hugely promising replacement for polluting fuels. One of the
possibilities is to split liquid water using the electricity that is
generated (electrolysis). Among oxygen, this produces hydrogen gas that
can be used as a clean fuel in the chemical industry or combusted in
fuel cells - in cars for example - to drive engines...