Mechanism of cathodic electron transfer and hydrogen-mediated enhanced measures in microbial electrosynthesis system
Microbial electrosynthesis system is a sustainable technology that uses microorganisms as biocatalysts to reduce carbon dioxide(C02)to organic compounds using renewable energy sources,which can help to mitigate atmospheric greenhouse gases and realize a low-carbon recycling bio-economy and industrial CO2 bioconversion process.This paper describes the electron transfer mechanisms between the cathode and microorganisms in microbial electrosynthesis system,including direct and indirect electron transfer,of which hydrogen(H2)mediated indirect electron transfer is the most studied electron transfer process.This paper also introduces the occurrence mechanisms of cathodic pure electrochemical hydrogen evolution reaction and biological hydrogen production in microbial electrosynthesis system,and elaborates on the interdependence and collaboration mechanisms between different microorganisms in the process of H2 production and utilization and CO2 reduction.The paper also focuses on the H2 mediated indirect electron transfer process and proposes enhanced measures such as promoting the cathodic hydrogen evolution reaction,adding exogenous media and optimizing the reactor design in order to promote hydrogen production and CO2 reduction process.This review provides theoretical basis and technological support for improving the electron transfer efficiency and target product yield of microbial electrosynthesis system.
microbial electrosynthesisdirect electron transferindirect electron transferhydrogen mediatedcarbon dioxide
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