Impact of external resistance acclimation on charge transfer and diffusion resistance in bench-scale microbial fuel cells

Ruggero Rossi; Bruce E. Logan

doi:10.1016/j.biortech.2020.123921

Impact of external resistance acclimation on charge transfer and diffusion resistance in bench-scale microbial fuel cells

Ruggero Rossi, Bruce E. Logan

Research output: Contribution to journal › Article › peer-review

42 Scopus citations

Abstract

Reducing the external resistance (R_ext) for microbial fuel cell (MFC) acclimation can substantially alter the anode performance in terms of charge transfer (R_CT), diffusion (R_d) and total anode resistance (R_An). Electrochemical impedance spectroscopy (EIS) was used to quantify anode impedance at different set potentials. Reducing R_ext from 50 Ω to 20 Ω during acclimation reduced R_CT by 31% (from 6.12 ± 0.09 mΩ m² to 4.21 ± 0.03 mΩ m²) and R_d by 18% (from 3.4 ± 0.2 mΩ m² to 2.8 ± 0.1 mΩ m²) at a set anode potential of −115 mV during EIS. Overall R_An decreased by 27%, to 5.13 ± 0.02 mΩ m² for acclimation at 20 Ω, enabling the anode to achieve 38% higher current densities of 29 ± 1 A m⁻². The results show a clear dependence of acclimation procedures and external resistance on kinetic and diffusion components of anode impedance that can impact overall bioelectrochemical performance.

Original language	English (US)
Article number	123921
Journal	Bioresource technology
Volume	318
DOIs	https://doi.org/10.1016/j.biortech.2020.123921
State	Published - Dec 2020

All Science Journal Classification (ASJC) codes

Bioengineering
Environmental Engineering
Renewable Energy, Sustainability and the Environment
Waste Management and Disposal

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.biortech.2020.123921

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title = "Impact of external resistance acclimation on charge transfer and diffusion resistance in bench-scale microbial fuel cells",

abstract = "Reducing the external resistance (Rext) for microbial fuel cell (MFC) acclimation can substantially alter the anode performance in terms of charge transfer (RCT), diffusion (Rd) and total anode resistance (RAn). Electrochemical impedance spectroscopy (EIS) was used to quantify anode impedance at different set potentials. Reducing Rext from 50 Ω to 20 Ω during acclimation reduced RCT by 31% (from 6.12 ± 0.09 mΩ m2 to 4.21 ± 0.03 mΩ m2) and Rd by 18% (from 3.4 ± 0.2 mΩ m2 to 2.8 ± 0.1 mΩ m2) at a set anode potential of −115 mV during EIS. Overall RAn decreased by 27%, to 5.13 ± 0.02 mΩ m2 for acclimation at 20 Ω, enabling the anode to achieve 38% higher current densities of 29 ± 1 A m−2. The results show a clear dependence of acclimation procedures and external resistance on kinetic and diffusion components of anode impedance that can impact overall bioelectrochemical performance.",

author = "Ruggero Rossi and Logan, {Bruce E.}",

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year = "2020",

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doi = "10.1016/j.biortech.2020.123921",

language = "English (US)",

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AU - Rossi, Ruggero

AU - Logan, Bruce E.

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Y1 - 2020/12

N2 - Reducing the external resistance (Rext) for microbial fuel cell (MFC) acclimation can substantially alter the anode performance in terms of charge transfer (RCT), diffusion (Rd) and total anode resistance (RAn). Electrochemical impedance spectroscopy (EIS) was used to quantify anode impedance at different set potentials. Reducing Rext from 50 Ω to 20 Ω during acclimation reduced RCT by 31% (from 6.12 ± 0.09 mΩ m2 to 4.21 ± 0.03 mΩ m2) and Rd by 18% (from 3.4 ± 0.2 mΩ m2 to 2.8 ± 0.1 mΩ m2) at a set anode potential of −115 mV during EIS. Overall RAn decreased by 27%, to 5.13 ± 0.02 mΩ m2 for acclimation at 20 Ω, enabling the anode to achieve 38% higher current densities of 29 ± 1 A m−2. The results show a clear dependence of acclimation procedures and external resistance on kinetic and diffusion components of anode impedance that can impact overall bioelectrochemical performance.

AB - Reducing the external resistance (Rext) for microbial fuel cell (MFC) acclimation can substantially alter the anode performance in terms of charge transfer (RCT), diffusion (Rd) and total anode resistance (RAn). Electrochemical impedance spectroscopy (EIS) was used to quantify anode impedance at different set potentials. Reducing Rext from 50 Ω to 20 Ω during acclimation reduced RCT by 31% (from 6.12 ± 0.09 mΩ m2 to 4.21 ± 0.03 mΩ m2) and Rd by 18% (from 3.4 ± 0.2 mΩ m2 to 2.8 ± 0.1 mΩ m2) at a set anode potential of −115 mV during EIS. Overall RAn decreased by 27%, to 5.13 ± 0.02 mΩ m2 for acclimation at 20 Ω, enabling the anode to achieve 38% higher current densities of 29 ± 1 A m−2. The results show a clear dependence of acclimation procedures and external resistance on kinetic and diffusion components of anode impedance that can impact overall bioelectrochemical performance.

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Impact of external resistance acclimation on charge transfer and diffusion resistance in bench-scale microbial fuel cells

Abstract

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