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Regulated surface potential impacts bioelectrogenic activity, interfacial electron transfer and microbial dynamics in microbial fuel cell

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  • Modestra, J. Annie
  • Reddy, C. Nagendranatha
  • Krishna, K. Vamshi
  • Min, Booki
  • Mohan, S. Venkata

Abstract

Influence of surface anode potential on the performance of microbial fuel cell (MFC) was evaluated by opting positive and negative poised anode potentials (+100/-100 mV) on two MFCs, and studied at two phases (during potential (DP) and post potential (PP)) along with a third MFC operated as control (no applied anode potential). Variation in physico-chemical factors as well as biocatalytic metabolic behavior was analyzed in terms of electron transfer, power density, electro-kinetics and microbial community. Post potential operation at −100 mV depicted rapid electron transfer, higher redox catalytic currents (−0.44/0.42 mA) and voltage (653 ± 28 mV) in comparison to other experimental conditions. Disparity in electron carriers is noticed at both the phases with +100 mV (dominantly direct electron transfer)/-100 mV (cytochrome components) potential as well as control (non-specific and multiple carriers) which signify alteration in electron transfer mechanism aligned with change in surface potential. Microbial community analysis depicted the enrichment of exo-electrogenic bacteria belonging to phylum Proteobacteria (Gram negative bacteria) dominant at −100 mV, while Firmicutes (Gram positive bacteria) at +100 mV and a mixed bacterial population at control. Electrochemical investigations correlated with biological efficiency of MFC, which discerns a way to comprehend the underlying electron transfer process triggered in response to change in anode potential.

Suggested Citation

  • Modestra, J. Annie & Reddy, C. Nagendranatha & Krishna, K. Vamshi & Min, Booki & Mohan, S. Venkata, 2020. "Regulated surface potential impacts bioelectrogenic activity, interfacial electron transfer and microbial dynamics in microbial fuel cell," Renewable Energy, Elsevier, vol. 149(C), pages 424-434.
    • Handle: RePEc:eee:renene:v:149:y:2020:i:c:p:424-434
    DOI: 10.1016/j.renene.2019.12.018
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    References listed on IDEAS

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