GARCIA, Marine; SOMMIER, Alain; MICHAU, Dominique; CLISSON, Gérald; BATSALE, Jean-Christophe; CHEVALIER, Stéphane

doi:10.1016/j.electacta.2023.142489

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GARCIA, Marine
Institut de Mécanique et d'Ingénierie [I2M]

SOMMIER, Alain
Institut de Mécanique et d'Ingénierie [I2M]

MICHAU, Dominique
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Article de revue

Ce document a été publié dans

Electrochimica Acta. 2023, vol. 460, p. 142489 (8 p.)

Elsevier

Résumé en anglais

Microfluidic fuel cells (MFCs) are microfluidic electrochemical conversion devices that are used to power electrical equipment. Their performance relies on improving reactant mass transfer at the electrode interface. In this work, a MFC is developed to implement a novel imaging technique that allows the measurement of reactant concentration fields, featuring formic acid as the fuel and potassium permanganate as the oxidant. The concentration fields were imaged based on transmitted visible spectroscopy, which links the light intensity passing through the MFC to its local reactant concentration. An analytical model was developed to estimate the mass diffusivity and kinetic reaction rate coefficient. For the first time, mass transport and transfer coefficient were simultaneously measured during operation. These parameters estimated using the proposed technique can be implemented in a numerical model to predict the MFC performance and concentration distribution. This work paves the way towards advanced imaging tools for operando mass transfer characterizations in microfluidics and Tafel kinetic characterization in many electrochemical devices.< Réduire

Mots clés en anglais

Fuel cells

Imaging

Spectroscopy

Mass transfer

Microfluidic

Concentration fields

DOI

http://dx.doi.org/10.1016/j.electacta.2023.142489

Project ANR

IMagerie Multiphysique des Piles A Combustible microfluidiques - ANR-20-CE05-0018

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026