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Self-stratified and self-powered micro-supercapacitor integrated into a microbial fuel cell operating in human urine

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

Authors

Francesca Soavi



Abstract

© 2019 The Authors A self-stratified microbial fuel cell fed with human urine with a total internal volume of 0.55 ml was investigated as an internal supercapacitor, for the first time. The internal self-stratification allowed the development of two zones within the cell volume. The oxidation reaction occurred on the bottom electrode (anode) and the reduction reaction on the top electrode (cathode). The electrodes were discharged galvanostatically at different currents and the two electrodes were able to recover their initial voltage value due to their red-ox reactions. Anode and cathode apparent capacitance was increased after introducing high surface area activated carbon embedded within the electrodes. Peak power produced was 1.20 ± 0.04 mW (2.19 ± 0.06 mW ml −1 ) for a pulse time of 0.01 s that decreased to 0.65 ± 0.02 mW (1.18 ± 0.04 mW ml −1 ) for longer pulse periods (5 s). Durability tests were conducted over 44 h with ≈2600 discharge/recharge cycles. In this relatively long-term test, the equivalent series resistance increased only by 10% and the apparent capacitance decreased by 18%.

Journal Article Type Article
Publication Date Jun 1, 2019
Journal Electrochimica Acta
Print ISSN 0013-4686
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 307
Pages 241-252
APA6 Citation Santoro, C., Walter, X. A., Soavi, F., Greenman, J., & Ieropoulos, I. (2019). Self-stratified and self-powered micro-supercapacitor integrated into a microbial fuel cell operating in human urine. Electrochimica Acta, 307, 241-252. https://doi.org/10.1016/j.electacta.2019.03.194
DOI https://doi.org/10.1016/j.electacta.2019.03.194
Keywords microbial fuel cell, supercapacitor, high power density, urine, discharge, self-powered
Publisher URL https://doi.org/10.1016/j.electacta.2019.03.194

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