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Related Experiment Video

Updated: Nov 7, 2025

Characterizing Electron Transport through Living Biofilms
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MXene-coated biochar as potential biocathode for improved microbial electrosynthesis system.

Khurram Tahir1, Waheed Miran2, Jiseon Jang3

  • 1Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 41566, Republic of Korea.

The Science of the Total Environment
|May 4, 2021
PubMed
Summary

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This study enhances microbial electrosynthesis (MES) by coating biochar with MXene, boosting energy storage and chemical production. The modified cathode significantly increases current and butyrate yield, demonstrating effective biochar modification for selective MES products.

Area of Science:

  • Electrochemistry
  • Microbiology
  • Materials Science

Background:

  • Microbial electrosynthesis (MES) offers large-scale energy storage and carbon footprint reduction by converting CO2 into chemicals.
  • Current challenges in MES include expensive electrodes, low current densities, and multiple product formation.
  • Developing cost-effective and efficient electrode materials is crucial for advancing MES technology.

Purpose of the Study:

  • To investigate a novel MXene-coated biochar cathode for enhanced microbial electrosynthesis.
  • To improve electrical conductivity, charge transfer efficiency, and product selectivity in MES.
  • To analyze the impact of electrode modification on microbial community structure and function.

Main Methods:

  • A multilayered, conductive MXene structure was coated onto a biochar substrate.
Keywords:
BiocathodeBiocharButyrateMXeneMicrobial electrosynthesis

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  • The modified biochar was tested as a cathode in a microbial electrosynthesis system.
  • Cathodic current production, butyrate yield, and microbial community composition were analyzed.

    • Main Results:

    • The MXene-coated biochar exhibited improved electrical conductivity and charge transfer efficiency.
    • Cathodic current production increased 2.3-fold compared to uncoated biochar.
    • Butyrate production increased 1.7-fold, with dominant microbial phyla including Firmicutes, Proteobacteria, and Bacteroidetes.

    Conclusions:

    • Biochar modification with MXene is an effective strategy for enhancing MES performance.
    • The developed cathode promotes selective microbial enrichment and increases the yield of desired chemical products.
    • This approach addresses key challenges in MES, paving the way for scalable energy storage solutions.