Abstract
Microbial fuel cells (MFCs) have emerged as a promising technology for sustainable energy production. However, the power density of MFCs is limited by the anode performance. In this study, Rhus typhina was used as a raw material for the synthesis of 3D freestanding electrodes by freeze-drying and one-step carbonization. Based on the unique micron-scale tubular structure, Rhus typhina carbon (RtC) increases the active bacterial colonization surface area several times and improves the extracellular electron transfer (EET) by augmenting the interaction between the bacteria and the anode. In addition, 16S rRNA gene sequence analysis indicates that the obtained RtC-900 anode promotes enrichment of the major exoelectrogens (Geobacter), and the relative abundance reaches 70.3%. The maximum power density of the dual-chamber MFC with the 3D free-standing anode is 6.01 W m−2, and the stable power output over 300 days is superior to that of conventional MFC in performance.
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