Clean and green energy has become
very much desirable in recent
times to mitigate the environmental problem associated with fossil
fuels. Hydrogen can be utilized as sustainable energy resources whenever
it is produced via green routes. Hydrogen production using solar energy
is a pollution-free route as the carbon footprint is zero or significantly
less than other hydrogen-generation methods. This review elucidates
various hydrogen-generation routes using solar energy as the primary
energy resource. Both thermal and photoassisted routes are incorporated
in this review. It is found that solar photovoltaic cell associated
with water electrolyzer is very popular. Biomass can also be converted
to hydrogen through thermal and photoassisted processes. The economic
analysis confirmed that hydrogen-fueled cars are economical as well
as environmentally friendly.