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Shewanella oneidensis MR-1 respires CdSe quantum dots for photocatalytic hydrogen evolution.


ABSTRACT: Living bio-nano systems for artificial photosynthesis are of growing interest. Typically, these systems use photoinduced charge transfer to provide electrons for microbial metabolic processes, yielding a biosynthetic solar fuel. Here, we demonstrate an entirely different approach to constructing a living bio-nano system, in which electrogenic bacteria respire semiconductor nanoparticles to support nanoparticle photocatalysis. Semiconductor nanocrystals are highly active and robust photocatalysts for hydrogen (H2) evolution, but their use is hindered by the oxidative side of the reaction. In this system, Shewanella oneidensis MR-1 provides electrons to a CdSe nanocrystalline photocatalyst, enabling visible light-driven H2 production. Unlike microbial electrolysis cells, this system requires no external potential. Illuminating this system at 530 nm yields continuous H2 generation for 168 h, which can be lengthened further by replenishing bacterial nutrients.

SUBMITTER: Edwards EH 

PROVIDER: S-EPMC10151509 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature

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<i>Shewanella oneidensis</i> MR-1 respires CdSe quantum dots for photocatalytic hydrogen evolution.

Edwards Emily H EH   Jelušić Jana J   Kosko Ryan M RM   McClelland Kevin P KP   Ngarnim Soraya S SS   Chiang Wesley W   Lampa-Pastirk Sanela S   Krauss Todd D TD   Bren Kara L KL  

Proceedings of the National Academy of Sciences of the United States of America 20230417 17


Living bio-nano systems for artificial photosynthesis are of growing interest. Typically, these systems use photoinduced charge transfer to provide electrons for microbial metabolic processes, yielding a biosynthetic solar fuel. Here, we demonstrate an entirely different approach to constructing a living bio-nano system, in which electrogenic bacteria respire semiconductor nanoparticles to support nanoparticle photocatalysis. Semiconductor nanocrystals are highly active and robust photocatalysts  ...[more]

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