Abstract
Biological hydrogen production by microalgae is a potential sustainable, renewable and clean source of energy. However, many barriers limiting photohydrogen production in these microorganisms remain unsolved. In order to explore this potential and make biohydrogen industrially affordable, the unicellular microalga Chlamydomonas reinhardtii is used as a model system to solve barriers and identify new approaches that can improve hydrogen production. Recently, Chlamydomonas–bacteria consortia have opened a new window to improve biohydrogen production. In this study, we review the different consortia that have been successfully employed and analyze the factors that could be behind the improved H2 production.
Highlights
Finding renewable, sustainable and clean energy sources has become one of the main priorities of our society
In the photosystem II (PSII)-dependent pathway, the electrons generated at the level of PSII from water splitting are transferred to the photosynthetic electron chain, where they reach photosystem I (PSI) and the ferredoxins (FDXs), which are the final electron donors to the hydrogenases (HYDAs) [7,8]
H2 photoproduction in green algae occurs under anoxic/hypoxic conditions and, at a physiological level, H2 production is a transitory phenomenon since O2 and H2 co-evolution are incompatible
Summary
Sustainable and clean energy sources has become one of the main priorities of our society. H2 production techniques include steam reforming natural gas/oil, coal gasification, biomass gasification/pyrolysis, and electrolysis and thermolysis of water All these techniques are either polluting and/or demand a large amount of energy [1,2]. Under this scenario, the biological production of H2 (bioH2 ) has garnered considerable attention in recent decades, as it could be a cheap and renewable source of fuel. The biological production of H2 (bioH2 ) has garnered considerable attention in recent decades, as it could be a cheap and renewable source of fuel Different microorganisms such as microalgae, cyanobacteria, photosynthetic bacteria and some heterotrophic bacteria can produce H2 [3,4]. In all the H2 -producing microorganisms, O2 is a strong repressor of H2 production
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