4.7 Article

MXene-coated biochar as potential biocathode for improved microbial electrosynthesis system

Journal

SCIENCE OF THE TOTAL ENVIRONMENT
Volume 773, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.scitotenv.2021.145677

Keywords

Biochar; MXene; Biocathode; Microbial electrosynthesis; Butyrate

Funding

  1. Basic Science Research Program through theNational Research Foundation of Korea (NRF) - Ministry of Education [NRF2018R1A6A1A03024962]
  2. Ministry of Science and ICT, South Korea [NRF-2020R1A2C2100746]

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Microbial electrosynthesis (MES) has great potential for large-scale energy storage. A study utilizing a multilayered and conductive MXene structure coated on biochar as a MES cathode showed improved electrical conductivity, increased charge transfer efficiency, and selective microbial enrichment characteristics, leading to significant improvements in cathodic current production and butyrate yield. Microbial community analysis revealed that Firmicutes, Proteobacteria, and Bacteroidetes were enriched in the MXene-coated biochar biofilm, indicating the effectiveness of biochar modification in achieving selective products through MES.
Microbial electrosynthesis (MES) holds tremendous large scale energy storage potential. By promoting the bio-conversion of carbon dioxide (bicarbonate) into useful chemical commodities, this technique utilizes renewable energy and reduces carbon footprint. However, expensive electrode materials, low current densities, and multiple electrosynthesis products are major challenges to this field. To this end, this study examines a multilayered and conductive MXene structure that was coated on a cost-effective biochar substrate and tested as a MES cathode. These results show this coating yielded improved electrical conductivity, increased charge transfer efficiency, and selective microbial enrichment characteristics, resulting in a 2.3-fold increase in cathodic current production in comparison to the uncoated biochar. Moreover, an increase in active sites improved mass transfer and microbial growth, producing 1.7-fold increase in butyrate in comparison to the uncoated control. Considering that electrode attached microbial communities play a major role in final products, microbial community analyses was completed, suggesting that selective microbial enrichment was promoted as Firmicutes (66%), Proteobacteria (13%), and Bacteroidetes (12%) (i.e., exoelectrogenic and butyrate producing phyla) which were dominant in the MXene-coated biochar biofilm. These results show that biochar modification is an effective technique for achieving selective products through MES. (C) 2021 Elsevier B.V. All rights reserved.

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