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Air-breathing cathode self-powered supercapacitive microbial fuel cell with human urine as electrolyte

Santoro, Carlo; Walter, Xavier Alexis; Soavi, Francesca; Greenman, John; Ieropoulos, Ioannis

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Authors

Carlo Santoro

Francesca Soavi

Yannis Ieropoulos Ioannis2.Ieropoulos@uwe.ac.uk
Professor in Bioenergy & Director of B-B



Abstract

In this work, a membraneless microbial fuel cell (MFC) with an empty volume of 1.5 mL, fed continuously with hydrolysed urine, was tested in supercapacitive mode (SC-MFC). In order to enhance the power output, a double strategy was used: i) a double cathode was added leading to a decrease in the equivalent series resistance (ESR); ii) the apparent capacitance was boosted up by adding capacitive features on the anode electrode. Galvanostatic (GLV) discharges were performed at different discharge currents. The results showed that both strategies were successful obtaining a maximum power output of 1.59 ± 0.01 mW (1.06 ± 0.01 mW mL−1) at pulse time of 0.01 s and 0.57 ± 0.01 mW (0.38 ± 0.01 mW mL−1) at pulse time of 2 s. The highest energy delivered at ipulse equal to 2 mA was 3.3 ± 0.1 mJ. The best performing SC-MFCs were then connected in series and parallel and tested through GLV discharges. As the power output was similar, the connection in parallel allowed to roughly doubling the current produced. Durability tests over ≈5.6 days showed certain stability despite a light overall decrease.

Citation

Santoro, C., Walter, X. A., Soavi, F., Greenman, J., & Ieropoulos, I. (2020). Air-breathing cathode self-powered supercapacitive microbial fuel cell with human urine as electrolyte. Electrochimica Acta, 353, Article 136530. https://doi.org/10.1016/j.electacta.2020.136530

Journal Article Type Article
Acceptance Date May 25, 2020
Online Publication Date May 26, 2020
Publication Date Sep 1, 2020
Deposit Date Jul 27, 2020
Publicly Available Date Jul 28, 2020
Journal Electrochimica Acta
Print ISSN 0013-4686
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 353
Article Number 136530
DOI https://doi.org/10.1016/j.electacta.2020.136530
Keywords Electrochemistry; General Chemical Engineering
Public URL https://uwe-repository.worktribe.com/output/6388045

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