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Bioelectrosynthetic Conversion of CO 2 Using Different Redox Mediators: Electron and Carbon Balances in a Bioelectrochemical System

Author

Listed:
  • Shuwei Li

    (School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Korea)

  • Young Eun Song

    (School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Korea)

  • Jiyun Baek

    (School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Korea)

  • Hyeon Sung Im

    (School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Korea)

  • Mutyala Sakuntala

    (School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Korea)

  • Minsoo Kim

    (School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Korea)

  • Chulhwan Park

    (Department of Chemical Engineering, Kwangwoon University, 20 Kwangwoon-Ro, Nowon-Gu, Seoul 01897, Korea)

  • Booki Min

    (Department of Environmental Science and Engineering, Kyung Hee University, 1 Seocheon-dong, Yongin-si, Gyeonggi-do 446-701, Korea)

  • Jung Rae Kim

    (School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Korea)

Abstract

Microbial electrosynthesis (MES) systems can convert CO 2 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 CO 2 reduction reaction on the cathode. The mediators, NR and HNQ, improved acetate production from CO 2 (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 CO 2 reduction to acetate on the cathode surface. These results suggest that the addition of mediators to MES can improve CO 2 conversion to acetate with further optimization in an operating strategy of electrosynthesis processes.

Suggested Citation

  • Shuwei Li & Young Eun Song & Jiyun Baek & Hyeon Sung Im & Mutyala Sakuntala & Minsoo Kim & Chulhwan Park & Booki Min & Jung Rae Kim, 2020. "Bioelectrosynthetic Conversion of CO 2 Using Different Redox Mediators: Electron and Carbon Balances in a Bioelectrochemical System," Energies, MDPI, vol. 13(10), pages 1-13, May.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:10:p:2572-:d:360086
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    Cited by:

    1. Pelaz, Guillermo & González-Arias, Judith & Mateos, Raúl & Escapa, Adrián, 2023. "Electromethanogenesis for the conversion of hydrothermal carbonization exhaust gases into methane," Renewable Energy, Elsevier, vol. 216(C).

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