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Fluorinated bimetallic nanoparticles decorated carbon nanofibers as highly active and durable oxygen electrocatalyst for fuel cells

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Journal of Energy Chemistry 2022年第10期31卷 549-555,I0014页

作者： Yiming Leng Bolong Yang Yun Zhao Zhonghua Xiang State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China

The low activity and durability are still the critical barriers for non-precious metal electrocatalyst,mainly involving M-N/C(M=Fe,Co,Mn et al),applied in fuel *** bimetallic sites has been explored as an effective method to boost the performance of the catalyst for the synergistic effect between metal ***,this synergistic effect is always suppressed in acidic conditions and results in unstable catalytic *** we create novel fluorinated iron(Fe)and cobalt(Co)bimetallic nanoparticles distributed on nitrogen-doped carbon nanofibers(CNFs)for oxygen reduction reaction(orr).The fluorination strongly increased the charge density of the bimetallic catalyst and resulted in a remarkable catalytic performance with the half-wave potential of 804 m V in 0.1 M HCl O_(4)and 1.6 times power density improvement for the proton exchange membrane fuel cell ***,the chemical and mechanical robust CNFs support improved the electric conductivity and stability of bimetallic catalysts,which leads to an ultra-stable *** fuel cell voltage can keep stable even after 110 h,instead of the continuingly decrease in the traditional M-N/C.

关键词： Bimetallic catalyst Fluorination Electrospinning orr catalyst PEM fuel cell

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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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