André L. D. Lima
Interchangeable Biomass Fuels for Paper-Based Microfluidic Fuel Cells: Finding Their Power Density Limits
Lima, André L. D.; Rocha, Piter M.; Silva, Adilson C.; Alves Fernandes, Jesum; Martins, Cauê A.
Piter M. Rocha
Adilson C. Silva
Dr JESUM ALVES FERNANDES Jesum.AlvesFernandes@nottingham.ac.uk
Cauê A. Martins
Paper batteries are self-pumping emerging tools for powering portable analytical systems. These disposable energy converters must be low-cost and must achieve enough energy to power electronic devices. The drawback is to reach high energy keeping the low cost. Here, for the first time, we report a paper-based microfluidic fuel cell (PµFC) equipped with Pt/C on carbon paper (CP) anode and a metal-free CP cathode fed by biomass-derived fuels to deliver high power. The cells were engineered in mixed media configuration, where methanol, ethanol, ethylene glycol, or glycerol is electro-oxidized in an alkaline medium while Na2S2O8 is reduced in an acidic medium. This strategy allows for optimizing each half-cell reaction independently. The colaminar channel of the cellulose paper was chemically investigated by mapping the composition, which reveals a majority of elements from the catholyte and anolyte on each respective side, and a mixture of both at the interface, assuring the existing colaminar system. Moreover, the colaminar flow was investigated by investigating the flow rate considering recorded videos for the first time. All PµFC shows 150-200 s to build the stable colaminar flow, which matches the time to reach a stable open circuit voltage. The flow rate is similar for different concentrations of methanol and ethanol, but it decreases with the increase in ethylene glycol and glycerol concentrations, suggesting longer residence time for the reactants. The cells perform differently for the different concentrations, and their limiting power densities are composed of a balance among anode poisoning, residence time, and viscosity of the liquids. The sustainable PµFCs can be interchangeably fed by the four biomass-derived fuels to deliver ~2.2-3.9 mW cm-2. This allows choosing the proper fuel due to their availability. The unprecedented PµFC fed by ethylene glycol delivered 6.76 mW cm-2, which is the benchmark output power for a paper battery fed by alcohol.
Lima, A. L. D., Rocha, P. M., Silva, A. C., Alves Fernandes, J., & Martins, C. A. (2023). Interchangeable Biomass Fuels for Paper-Based Microfluidic Fuel Cells: Finding Their Power Density Limits. ACS Applied Materials and Interfaces, 15(9), 11895–11905. https://doi.org/10.1021/acsami.2c23192
|Journal Article Type||Article|
|Acceptance Date||Feb 16, 2023|
|Online Publication Date||Feb 27, 2023|
|Publication Date||Mar 8, 2023|
|Deposit Date||Mar 6, 2023|
|Publicly Available Date||Feb 28, 2024|
|Journal||ACS Applied Materials and Interfaces|
|Publisher||American Chemical Society|
|Peer Reviewed||Peer Reviewed|
|Keywords||Paper batteries; Metal-free cathode; Methanol; Ethanol; Ethylene glycol; Glycerol|
|Additional Information||This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsami.2c23192|
This file is under embargo until Feb 28, 2024 due to copyright restrictions.
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