微生物燃料电池(Microbial fuel cells,MFCs)可将废水中的有机物直接转化为电能,提供了可持续电能的潜在解决方案.然而,MFCs在实际应用中存在细菌负载能力低、阳极与电化学活性生物膜之间的胞外电子传递(Extracellular electron transfer,EET)效率相对较差等不足.本研究采用绿色高效的微波辅助方法和高温退火工艺,成功制备了铁基纳米粒子改性碳布(Fe3C/Fe@CC),此复合材料具有较好的生物相容性和电催化活性,可作为MFCs的阳极材料.实验结果表明,基于Fe3C/Fe@CC复合材料的MFCs的功率密度高达2209 mW/m2,相比基于纯碳布阳极的MFCs(1933 mW/m2)提高了17%,这主要是因为Fe3C/Fe@CC能够有效提高微生物与电极之间的EET效率,增大电化学活性表面积,同时促进产电菌地杆菌(Geobacter)的富集.本研究采用微波辅助和高温退火方法快速制备了高导电复合阳极,为MFCs阳极的大规模制备提供了一种新方法.
Preparation of Iron-based Nanoparticle-modified Carbon Cloth Composites and Their Application in Microbial Fuel Cells Anodes
Microbial fuel cells(MFCs)offer a potential solution for sustainable electricity generation by directly converting organic matter in wastewater into electrical energy.However,MFCs face challenges in practical applications,such as low bacterial loading capacity and relatively poor efficiency of extracellular electron transfer(EET)between the anode and the electrochemically active biofilm.In this study,a green and efficient microwave-assisted method combined with high-temperature annealing was successfully employed to prepare iron-based nanoparticle-modified carbon cloth(Fe3C/Fe@CC).This composite material exhibited excellent biocompatibility and electrocatalytic activity.When used as an anode material for MFCs,the Fe3C/Fe@CC-based MFCs demonstrated superior performance,achieving a power density of 2209 mW/m2,which was a 17%increase compared to MFCs with pure carbon cloth anodes(1933 mW/m2).This enhancement was primarily attributed to the effective improvement in EET efficiency between the microbes and the electrode,the increased electrochemically active surface area,and the promotion of the enrichment of the exoelectrogen Geobacter.This study utilized microwave assistance and high-temperature annealing to achieve rapid preparation of highly conductive composite anodes,providing a universal method for the large-scale production of anodes for MFCs.
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