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Synergistic S/Se-co-doped FeMn-N-C electrocatalyst for high-efficiency bioenergy conversion in microbial fuel cells
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DOI：10.1007/s10800-026-02486-3.png)
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Abstract
En 中文
Microbial fuel cells (MFCs) are constrained by sluggish anodic extracellular electron transfer (EET) and cathodic oxygen reduction reaction (ORR) kinetics under mild, near-neutral conditions. In this study, a bifunctional FeMn-SNC/Se catalyst, comprising FeMn-ZIF anchored on sulfur and nitrogen co-doped carbon nanosheets, was successfully constructed via a seed-mediated epitaxial growth followed by a selenization strategy, enabling the simultaneous enhancement of the anodic EET process and the cathodic ORR process. The SNC substrate (Sulfur and nitrogen co-doped carbon nanosheets) effectively inhibited the structural collapse and metal agglomeration of FeMn-ZIF during pyrolysis, maximizing the exposure of active sites and providing an excellent biocompatible interface for anodic microorganisms, thereby promoting the enrichment of electroactive bacteria and biofilm formation. The co-doping of S and Se modulated the intrinsic catalytic activity and reaction kinetics of the material, significantly enhancing the electrode conductivity. Electrochemical tests revealed that the FeMn-SNC/Se modified anode exhibited a charge transfer resistance (R-ct) of only 2.13 ohm, substantially lower than those of FeMn-NC (11.02 ohm) and FeMn-SNC (8.73 ohm). Its exchange current density reached 5.1 mA m(- 2), which is 9.62 and 4.43 times higher than those of FeMn-NC (0.53 mA m(- 2)) and FeMn-SNC (1.15 mA m(- 2)), respectively. Microbial community analysis confirmed that FeMn-SNC/Se successfully shaped an electricity-generating consortium predominantly centered around the highly efficient electroactive bacterium Geoalkalibacter (relative abundance approaching 90%). On the cathode side, FeMn-SNC/Se exhibited outstanding ORR activity, with an onset potential of 0.17 V, a limiting diffusion current density of - 5.25 mA m(- 2), and a Tafel slope as low as 174 mV dec(-)& sup1;. The MFC assembled with this bifunctional catalyst achieved a maximum power density of 3.25 +/- 0.1 W m(- 2), which is 2.95 times higher than that of the bare carbon felt (1.10 +/- 0.12 W m(-)& sup2;). This study provides new insights and a feasible pathway for the rational design of bifunctional electrode materials suitable for bioelectrochemical systems.
Keywords:
Microbial fuel cells
Extracellular electron transfer
Oxygen reduction reaction
MOF-derived material
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