Biohydrogen

Biohydrogen is H₂ that is produced biologically. Interest is high in this technology because H₂ is a clean fuel and can be readily produced from certain kinds of biomass, including biological waste. Furthermore some photosynthetic microorganisms are capable to produce H₂ directly from water splitting using light as energy source.

Besides the promising possibilities of biological hydrogen production, many challenges characterize this technology. First challenges include those intrinsic to H₂, such as storage and transportation of an explosive noncondensible gas. Additionally, hydrogen producing organisms are poisoned by O₂ and yields of H₂ are often low.