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Open AccessArticle

Bioelectrosynthetic Conversion of CO2 Using Different Redox Mediators: Electron and Carbon Balances in a Bioelectrochemical System

1
School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Korea
2
Department of Chemical Engineering, Kwangwoon University, 20 Kwangwoon-Ro, Nowon-Gu, Seoul 01897, Korea
3
Department of Environmental Science and Engineering, Kyung Hee University, 1 Seocheon-dong, Yongin-si, Gyeonggi-do 446-701, Korea
*
Authors to whom correspondence should be addressed.
Energies 2020, 13(10), 2572; https://doi.org/10.3390/en13102572
Received: 2 March 2020 / Revised: 6 April 2020 / Accepted: 14 May 2020 / Published: 19 May 2020
(This article belongs to the Special Issue Microbial Electrosynthesis)
Microbial electrosynthesis (MES) systems can convert CO2 to acetate and other value-added chemicals using electricity as the reducing power. Several electrochemically active redox mediators can enhance interfacial electron transport between bacteria and the electrode in MES systems. In this study, different redox mediators, such as neutral red (NR), 2-hydroxy-1,4-naphthoquinone (HNQ), and hydroquinone (HQ), were compared to facilitate an MES-based CO2 reduction reaction on the cathode. The mediators, NR and HNQ, improved acetate production from CO2 (165 mM and 161 mM, respectively) compared to the control (without a mediator = 149 mM), whereas HQ showed lower acetate production (115 mM). On the other hand, when mediators were used, the electron and carbon recovery efficiency decreased because of the presence of bioelectrochemical reduction pathways other than acetate production. Cyclic voltammetry of an MES with such mediators revealed CO2 reduction to acetate on the cathode surface. These results suggest that the addition of mediators to MES can improve CO2 conversion to acetate with further optimization in an operating strategy of electrosynthesis processes. View Full-Text
Keywords: carbon dioxide; microbial electrosynthesis (MES); redox mediator; carbon and electron balance carbon dioxide; microbial electrosynthesis (MES); redox mediator; carbon and electron balance
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MDPI and ACS Style

Li, S.; Song, Y.E.; Baek, J.; Im, H.S.; Sakuntala, M.; Kim, M.; Park, C.; Min, B.; Kim, J.R. Bioelectrosynthetic Conversion of CO2 Using Different Redox Mediators: Electron and Carbon Balances in a Bioelectrochemical System. Energies 2020, 13, 2572.

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