Defined and unknown roles of conductive nanoparticles for the enhancement of microbial current generation: A review

•Metallic and semiconductive nanoparticles (NPs) improve microbial electrocatalysis.•Exoelectrogen utilizes a variety of extracellular electron transfer (EET) mechanisms.•A long-distance electron transport pathway forms in exoelectrogen/NPs aggregation.•Biosynthesized NPs localized in outer membrane...

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Bibliographic Details
Published in:Bioresource technology 2022-04, Vol.350, p.126844-126844, Article 126844
Main Authors: Deng, Xiao, Luo, Dan, Okamoto, Akihiro
Format: Article
Language:English
Subjects:
Biocorrosion
Bioelectric Energy Sources - microbiology
Bioelectrochemical system
Biogenic nanoparticles
Corrosion
Electrodes
Electron Transport
Electrons
Extracellular electron transfer
Microbial electrosynthesis
Microbial fuel cells
Nanoparticles
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Summary:•Metallic and semiconductive nanoparticles (NPs) improve microbial electrocatalysis.•Exoelectrogen utilizes a variety of extracellular electron transfer (EET) mechanisms.•A long-distance electron transport pathway forms in exoelectrogen/NPs aggregation.•Biosynthesized NPs localized in outer membrane function as an EET pathway.•Importance of physiological interaction between bacteria and NPs is suggested. The ability of various bacteria to make use of solid substrates through extracellular electron transfer (EET) or extracellular electron uptake (EEU) has enabled the development of valuable biotechnologies such as microbial fuel cells (MFCs) and microbial electrosynthesis (MES). It is common practice to use metallic and semiconductive nanoparticles (NPs) for microbial current enhancement. However, the effect of NPs is highly variable between systems, and there is no clear guideline for effectively increasing the current generation. In the present review, the proposed mechanisms for enhancing current production in MFCs and MES are summarized, and the critical factors for NPs to enhance microbial current generation are discussed. Implications for microbially induced iron corrosion, where iron sulfide NPs are proposed to enhance the rate of EEU, photochemically driven MES, and several future research directions to further enhance microbial current generation, are also discussed.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2022.126844