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Influence of carbon-based cathodes on biofilm composition and electrochemical performance in soil microbial fuel cells

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Environmental Science and Ecotechnology 2023年第4期16卷 106-116页

作者： Arpita Nandy Daniel Farkas Belén Pepió-Tárrega Sandra Martinez-Crespiera Eduard Borràs Claudio Avignone-Rossa Mirella Di Lorenzo Department of Chemical Engineering and Centre for Biosensors Bioelectronics&Biodevices(C3Bio)University of BathClaverton DownBA27AYUK Department of Microbial Sciences University of SurreyGuildfordGU27XHUK LEITAT Technological Center C/de la Innovació208225TerrassaBarcelonaSpain

Increasing energy demands and environmental pollution concerns press for sustainable and environmentally friendly *** microbial fuel cell(SMFC)technology has great potential for carbon-neutral bioenergy generation and self-powered electrochemical *** this study,an in-depth assessment on the effect of several carbon-based cathode materials on the electrochemical performance of SMFCs is provided for the first *** innovative carbon nanofibers electrode doped with Fe(CNFFe)is used as cathode material in membrane-less SMFCs,and the performance of the resulting device is compared with SMFCs implementing either Pt-doped carbon cloth(PtC),carbon cloth,or graphite felt(GF)as the *** analyses are integrated with microbial analyses to assess the impact on both electrogenesis and microbial composition of the anodic and cathodic *** results show that CNFFe and PtC generate very stable performances,with a peak power density(with respect to the cathode geometric area)of 25.5 and 30.4 mW m^(−2),*** best electrochemical performance was obtained with GF,with a peak power density of 87.3 mW m^(−2).Taxonomic profiling of the microbial communities revealed differences between anodic and cathodic *** anodes were predominantly enriched with Geobacter and Pseudomonas species,while cathodic communities were dominated by hydrogen-producing and hydrogenotrophic bacteria,indicating H_(2)cycling as a possible electron transfer *** presence of nitrate-reducing bacteria,combined with the results of cyclic voltammograms,suggests microbial nitrate reduction occurred on GF *** results of this study can contribute to the development of effective SMFC design strategies for field implementation.

关键词： Soil microbial fuel cells ORR catalyst carbon nanofibre Microbial profiling

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