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The effect of internal capacitance on power quality and energy efficiency in a tubular microbial fuel cell

Paper ID Volume ID Publish Year Pages File Format Full-Text
34374 45020 2014 8 PDF Available
Title
The effect of internal capacitance on power quality and energy efficiency in a tubular microbial fuel cell
Abstract

•Internal capacitance of MFC with high surface carbon veil electrode and open/close circuit cycle was examined.•The pseudo-capacitive behaviour can be used to increase potential and power of MFC.•The cumulative charge was 39,807 C m−2 based on projected electrode area.

The pseudo-capacitive behaviour of a high surface area carbon veil electrode in a tubular microbial fuel cell (MFC) was investigated as a mechanism to enhance power quality and energy efficiency. Accumulated charge and energy from the anodic biofilm after prolonged open circuit times (1–120 min) were compared against equivalent periods of steady state loading (R = 100–3000 Ω). A significant difference in the amount of accumulated charge with different loads was observed, resulting in 1.051 C (R = 100 Ω) compared to 0.006 C (R = 3 kΩ). The automated application of short open and closed circuit (0.5–10 s) cycles resulted in an increase of power/current production (closed circuit alone), but presented lower efficiency considering entire open and closed period. The cumulative charge on the carbon veil electrode with biofilm was 39,807 C m−2 at 100 Ω. Electrochemical Impedance Spectroscopy (EIS) showed that the Helmholtz layer presented a double layer capacitance of more than ten times the biofilm on electrode. The results indicate that the capacitive behaviour could be utilized to increase the power quality, i.e. its availability/applicability with respect to the operation of low power consuming devices.

Keywords
Microbial fuel cell (MFC); Power quality; Double layer capacitance; Biofilm capacitance; Charge accumulation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 49, Issue 6, June 2014, Pages 973–980
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
Online Support
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