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Towards sustainable H2 evolution by using an algal-electro-photosynthetic process: The mediator selection alternates the electron sources for Chlorella sorokiniana SU-1
Ist Teil von
International journal of hydrogen energy, 2023-05, Vol.48 (46), p.17409-17419
Ort / Verlag
Elsevier Ltd
Erscheinungsjahr
2023
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Chlorella sorokiniana SU-1 is employed on the graphite-felt anode of a two-chamber cell connecting potentiostat (+0.4 V vs Ag/AgCl) to study its photoelectrochemical characteristics. Among the mediators selected, the current significantly reached 1.5 mA and 4.0 mA, respectively, when 0.3 mM 2,6-dimethoxy-1,4-benzoquinone and 5.5 mM ferricyanide were spiked. To give significant hydrogen evolution, the applied direct-circuit voltage could be reduced from 2.0 to 1.3 V (producing 1.5 mL-H2 h−1) due to the assistance of the algae-attached anode and platinum-mesh cathode. The current was boosted by spiking 0.2 g L−1 glucose under light/dark conditions. When using ferricyanide as a mediator, the current oscillated under alternating light-on/off conditions, while for 2,6-dimethoxy-1,4-benzoquinone, the increase or decrease of the current was clearly responding to the light going on and off. The microscopic observation of the SU-1 cell attachment indicates successful development by offering adequate illumination and electrode surfaces.
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•H2 evolution by using the algal-electro-photosynthetic process is feasible.•Ferricyanide was found to be the best mediator in boosting current generation.•The ferricyanide impairs the photosynthetic system of Chlorella sorokiniana SU-1.•The principal e− source for the photochemical current is cellular saccharide storage.