Imaging concentration fields in microfluidic fuel cells as a mass transfer characterization platform
Language
en
Article de revue
This item was published in
Electrochimica Acta. 2023, vol. 460, p. 142489 (8 p.)
Elsevier
English Abstract
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 ...Read more >
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.Read less <
English Keywords
Fuel cells
Imaging
Spectroscopy
Mass transfer
Microfluidic
Concentration fields
ANR Project
IMagerie Multiphysique des Piles A Combustible microfluidiques - ANR-20-CE05-0018
Origin
Hal imported