Journal article
Effect of electrode spacing on electron transfer and conductivity of Geobacter sulfurreducens biofilms
Bioelectrochemistry (Amsterdam, Netherlands), Vol.131, pp.107395-107395
02/2020
Handle:
https://hdl.handle.net/2376/108246
PMID: 31704456
Abstract
[Display omitted]
•The effect of gap width on biofilm conductivity was investigated.•Higher conductivity was observed for biofilm bridging on larger gaps.•Redox-driven EET was found for biofilms bridging gaps with different width.•Metabolic activity controls biofilm conductance.
To understand electron transport in electrochemically active biofilms, it is necessary to elucidate the heterogeneous electron transport across the biofilm/electrode interface and in the interior of G. sulfurreducens biofilms bridging gaps of varying widths. The conductivity of Geobacter sulfurreducens biofilm bridging nonconductive gaps with widths of 5µm, 10µm, 20µm and 50µm is investigated. Results of electrochemical gating measurement show that biofilm conductivity peaks at the potential of −0.35V vs. Ag/AgCl. The biofilm conductivity increases with gap width (10.4±0.2µScm−1 in 5µm gap, 13.3±0.2µScm−1 in 10µm gap, 16.7±1.4µScm−1 in 20µm gap and 41.8±2.02µScm−1 in 50µm gap). These results revealed that electron transfer in G. sulfurreducens biofilm is a redox-driven. In addition, higher biofilm conductivities and lower charge transfer resistances are observed in all gaps under a turnover condition than in those under a non-turnover condition. Our results offer insights into the spatial heterogeneity of biofilm structure and extracellular electron transfer in electrochemically active biofilms.
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Details
- Title
- Effect of electrode spacing on electron transfer and conductivity of Geobacter sulfurreducens biofilms
- Creators
- Panpan Liu - State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment, Tsinghua University, Beijing 100084, PR ChinaAbdelrhman Mohamed - The Gene and Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA 99163, USAPeng Liang - State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment, Tsinghua University, Beijing 100084, PR ChinaHaluk Beyenal - The Gene and Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA 99163, USA
- Publication Details
- Bioelectrochemistry (Amsterdam, Netherlands), Vol.131, pp.107395-107395
- Academic Unit
- Chemical Engineering and Bioengineering, School of
- Publisher
- Elsevier B.V
- Identifiers
- 99900547101801842
- Language
- English
- Resource Type
- Journal article