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<p>Carbon dots (CDs), nanoscale carbon particles have attracted significant research interest due to their unique physical properties and potential in microbial fuel cells (MFCs). This study reports the synthesis of CDs via a cost-effective hydrothermal method using water, methanol, and <i>Kigelia africana</i> root extracts as solvents. Transmission electron microscopy (TEM) revealed CDs with diameters below 10&#xa0;nm. Photoluminescence and UV-visible absorbance analyses confirmed their strong emission and light-harvesting capabilities. When applied as anode catalysts in MFCs, the CDs enhanced performance, achieving a maximum power density of 13.07&#xa0;W/m³—substantially higher than unmodified controls. These results demonstrate that CDs promote efficient extracellular electron transfer, positioning them as promising, green catalysts for high-efficiency MFCs.</p>

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Application of Kigelia africana-derived carbon dots in efficient extracellular electron transfer in microbial fuel cell

  • 期刊论文

  • 发表日期：

    2026年3月3日

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  • Kanu Priya,
  • Soumyajit Chandra,
  • Shilpa Kumari,
  • S. Shankara Narayanan,
  • Soumya Pandit,
  • Kuldeep Sharma,
  • Survesh Rustogi,
  • Nishant Ranjan,
  • Geetha S. J.,
  • Sanket J. Joshi

摘要

Carbon dots (CDs), nanoscale carbon particles have attracted significant research interest due to their unique physical properties and potential in microbial fuel cells (MFCs). This study reports the synthesis of CDs via a cost-effective hydrothermal method using water, methanol, and Kigelia africana root extracts as solvents. Transmission electron microscopy (TEM) revealed CDs with diameters below 10 nm. Photoluminescence and UV-visible absorbance analyses confirmed their strong emission and light-harvesting capabilities. When applied as anode catalysts in MFCs, the CDs enhanced performance, achieving a maximum power density of 13.07 W/m³—substantially higher than unmodified controls. These results demonstrate that CDs promote efficient extracellular electron transfer, positioning them as promising, green catalysts for high-efficiency MFCs.