4.8 Article

Overview of electroactive microorganisms and electron transfer mechanisms in microbial electrochemistry

期刊

BIORESOURCE TECHNOLOGY
卷 347, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.126579

关键词

Electroactive microorganisms; Bioelectrochemical system; Electron transfer; Microbial metabolism; Microbial electrosynthesis

资金

  1. National Research Foundation of Korea (NRF) - Korean government (MSIT) [NRF-2020R1A2C2012106]

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This review provides an overview of electroactive microorganisms (bacteria, microalgae, and fungi) acting as microbial electrocatalysts, and their exo- and endo-electron transfer mechanisms in bioelectrochemical systems (BESs). These microorganisms convert organic and inorganic compounds to electricity and biochemicals, ultimately optimizing and advancing bioelectrochemical techniques.
Electroactive microorganisms acting as microbial electrocatalysts have intrinsic metabolisms that mediate a redox potential difference between solid electrodes and microbes, leading to spontaneous electron transfer to the electrode (exo-electron transfer) or electron uptake from the electrode (endo-electron transfer). These microbes biochemically convert various organic and/or inorganic compounds to electricity and/or biochemicals in bioelectrochemical systems (BESs) such as microbial fuel cells (MFCs) and microbial electrosynthesis cells (MECs). For the past two decades, intense studies have converged to clarify electron transfer mechanisms of electroactive microbes in BESs, which thereby have led to improved bioelectrochemical performance. Also, many novel exoelectrogenic eukaryotes as well as prokaryotes with electroactive properties are being continuously discovered. This review presents an overview of electroactive microorganisms (bacteria, microalgae and fungi) and their exo- and endo-electron transfer mechanisms in BESs for optimizing and advancing bioelectrochemical techniques.

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