T.D. Le, D. Lasseux, X.P. Nguyen, G. Vignoles, N. Mano, A. Kuhn

Chemical Engineering Science 2017, 173, 153–167

A multi-scale model of diffusion/reaction at play in a porous electrode is developed and solutions to the physico-electro-chemical coupled problem are provided. This represents a key step to progress in the optimization of new efficient and innovative micro-electro-devices that needs to be addressed from a chemical engineering point of view. The pore-scale model based on Fickian diffusion in the porous medium and Nernstian layer and the electrochemical reaction governed by the Buttler-Volmer equation is upscaled using volume averaging to obtain a macroscopic model that describes the process on an effective equivalent medium. The validity and accuracy of the macroscopic model is successfully checked through the comparison with direct numerical simulations of the initial microscale model for amperometry tests. Predictions obtained from the upscaled model on the current intensity versus the scanning potential during voltammetry reveal to be in very good agreement with experimental results reported in the literature. These results show the capability of the macroscopic model to analyze the behavior of the porous electrode. In particular, it provides an efficient tool to study the dependence of the current intensity on the microstructure of the porous material and on the electrochemical parameters with the perspective of optimizing the electrode efficiency.

2017 21

Bipolar Electrode Array Embedded in a Polymer Light-Emitting Electrochemical Cell
mercredi 20 septembre 2017
J. Gao, S. Chen, F. AlTal, S. Hu, L. Bouffier, G. Wantz.  ACS Appl. Mater. Interfaces, 2017, 9, 32405–32410.  A linear array of aluminum discs is deposited between the driving... Read More...
Wireless electrochemical actuation of conducting polymers
dimanche 17 septembre 2017
B. Gupta, B. Goudeau, A. Kuhn Angew.Chem. Int. Ed. 2017, in press, DOI: 10.1002/anie.201709038 Electrochemical actuation of conducting polymers usually requires a direct connection to an electric... Read More...
Indirect bipolar electrodeposition of polymers for the controlled design of zinc microswimmers
vendredi 1 septembre 2017
Z. Ali Fattah, L. Bouffier, A. Kuhn Applied Materials Today 2017, 9, 259–265 Self-propelled micro/nanoswimmers performing directional motion are of great potential nowadays in the frame of... Read More...
Multi-scale modeling of diffusion and electrochemical reactions in porous micro-electrodes
vendredi 1 septembre 2017
T.D. Le, D. Lasseux, X.P. Nguyen, G. Vignoles, N. Mano, A. Kuhn Chemical Engineering Science 2017, 173, 153–167 A multi-scale model of diffusion/reaction at play in a porous electrode is developed...
Surface Q1 enhancement of a molecularly imprinted polymer film using sacrificial silica beads for increasing L-arabitol chemosensor sensitivity and detectability
vendredi 1 septembre 2017
M. Dabrowski, M. Cieplak, K. Noworyta, M. Heim, W. Adamkiewicz, A. Kuhn, P. S. Sharma, W. Kutner J. Mater. Chem. B, 2017,5, 6292-6299 Molecular imprinting in polymers leads, among others, to... Read More...
Coupling electrochemistry with in situ fluorescence (confocal) microscopy
lundi 17 juillet 2017
L. Bouffier, T. Doneux.  Current Opinion in Electrochemistry, DOI: 10.1016/j.coelec.2017.06.015. Electrochemistry and fluorescence microscopy are two complementary transduction techniques that... Read More...
Tracking nano-electrochemistry using individual plasmonic nanocavities
jeudi 13 juillet 2017
G. Di Martino,V. A. Turek,  A. Lombardi, I.  Szabó, B. de Nijs,  A. Kuhn, E. Rosta, J.J. Baumberg Nano Lett. 2017, 17, 4840-4845 We study in real time the optical response of... Read More...
2D Electrochemiluminescence: Light Emission Confined at the Oil/Water Interface in Emulsions Stabilized by Luminophore-Grafted Microgels
mardi 4 juillet 2017
Rémy Bois, Sabina Scarabino, Valérie Ravaine, Neso Sojic Langmuir, 2017, DOI: 10.1021/acs.langmuir.7b01585 We describe a method to confine electrochemiluminescence (ECL) at the oil-water interface... Read More...
Scanning Electrochemical Microscopy for BESs Characterization
lundi 3 juillet 2017
D. Zigah, O. Fontaine World Scientific, 2017, ISBN: 978-1-78634-353-6   Bioelectrochemical Systems (BESs) are innovative and sustainable devices. They combine biological and electrochemical... Read More...
Biredox Ionic Liquids: New Opportunities Toward High Performances Supercapacitors
lundi 3 juillet 2017
C. Bodin,  E. Mourad,  D. Zigah,  S. Le Vot,  S. A Freunberger,  F. Favier, O. Fontaine Faraday Discuss., 2017,DOI: 10.1039/C7FD00174F   Nowadays,... Read More...
Anisotropic Metal Deposition on TiO2 Particles by Electric Field Induced Charge Separation
samedi 17 juin 2017
S. Tiewcharoen, C. Warakulwit, V. Lapeyre, P. Garrigue, L. Fourier, C. Elissalde, S. Buffière, P. Legros, M. Gayot, J. Limtrakul, A. Kuhn Angew.Chem.Int.Ed. (2017) HOT PAPER 56, 11431-11435... Read More...
Plasmonic response and SERS modulation in electrochemical applied potentials
dimanche 11 juin 2017
G. Di Martino, V. A. Turek,  C. Tserkezis, A. Lombardi, A. Kuhn, J.J. Baumberg Faraday Discuss., 2017, in press,doi 10.1039/C7FD00130D We study the optical response of individual nm-wide... Read More...
On-chip enzymatic microbiofuel cell-powered integrated circuits
dimanche 11 juin 2017
A. G. Mark, E. Suraniti, J. Roche, H. Richter, A. Kuhn, N. Mano, P. Fischer Lab Chip, 2017, 17, 1761 HOT PAPER A variety of diagnostic and therapeutic medical technologies rely on long term... Read More...
Bipolar Electrochemistry with Organic Single Crystals for Wireless Synthesis of Metal-Organic Janus Objects and Asymmetric Photovoltage Generation
mercredi 31 mai 2017
I. Malytska, C. Mézière, M. Keilar, L. Hirsch, G. Wantz, N. Avarvari, A. Kuhn, L. Bouffier. Journal of Physical Chemistry C 2017, DOI: 10.1021/acs.jpcc.7b02678.   Bipolar... Read More...
Modulation of Wetting Gradients by Tuning the Interplay between Surface Structuration and Anisotropic Molecular Layers with Bipolar Electrochemistry
mercredi 31 mai 2017
L. Bouffier, S. Reculusa, V. Ravaine, A. Kuhn. ChemPhysChem 2017, DOI: 10.1002/cphc.201700398.   A new simple and versatile method for the preparation of surface wetting gradients is proposed.... Read More...
Oil-in-microgel strategy for enzymatic-triggered release of hydrophobic drugs
lundi 22 mai 2017
C.A. Busatto, H. Labie, V. Lapeyre, R. Auzely-Velty, A. Perro, N. Casis, J. Luna, D.A. Estenoz, V. Ravaine Journal of Colloid and Interface Science, 493, 2017, 356–364. Polymer microgels have... Read More...
Capillary-assisted bipolar electrochemistry: a focused minireview
vendredi 19 mai 2017
L. Bouffier, N. Sojic, A. Kuhn Electrophoresis, 2017, in press A bipolar electrode is quite unconventional as it behaves simultaneously as an anode and a cathode in contrast to a classic... Read More...
Hierarchical templating in deposition of semi-covalently imprinted inverse opal polythiophene film for femtomolar determination of human serum albumin
vendredi 19 mai 2017
M. Dabrowski, M. Cieplaka, P. Sindhu Sharma, P. Borowicz, K. Noworyta, W. Lisowski, F. D'Souza, A. Kuhn, W. Kutner Biosens.&Bioelectron. 2017, 94, 155-161 Nanostructured artificial receptor... Read More...
Spatially-resolved multicolor bipolar electrochemiluminescence
vendredi 19 mai 2017
Haidong Li, Laurent Bouffier, Stéphane Arbault, Alexander Kuhn, Conor F. Hogan, Neso SojicElectrochemistry Communications, 2017, in pressHere, we describe a new aspect of multicolor... Read More...
Co(III) Complexes of (1,3-Selen-2-yl)hydrazones and Their Sulphur Analogues: Comparative Structural, Electrochemical, Computational and Biological Activity Study
vendredi 19 mai 2017
Nenad R. Filipovic, Hana Elshaflu, Sonja Grubic, Ljiljana S. Jovanovic, Marko Rodic, Irena Novakovic, Aleksandar Malecevic, Ivana S. Djordjevic, Haidong Li, Neso Sojic, Aleksandar Marinkovic, Tamara... Read More...
Efficient Annihilation Electrochemiluminescence of Cationic Helicene Luminophores
vendredi 19 mai 2017
Haidong Li, Silvia Voci, Antoine Wallabregue, Catherine Adam, Geraldine M. Labrador, Romain Duwald, Irene Hernández Delgado, Simon Pascal, Johann... Read More...
Applications of Electrogenerated Chemiluminescence in Analytical Chemistry
vendredi 19 mai 2017
N. Sojic, S. Arbault, L. Bouffier, A. KuhnLuminescence in Electrochemistry. Applications in Analytical Chemistry, Physics and Biology. Eds. F. Miomandre, P. Audebert, 2017. Springer.The great success... Read More...
Recent Advances in Bipolar Electrochemistry
vendredi 19 mai 2017
L. Bouffier, D. Zigah, N. Sojic, A. Kuhn Electroanalytical Chemistry: A Series of Advances, Volume 27, eds. A.J. Bard, C.G. Zoski, 2017, CRC Press, Taylor&Francis Group, April 24, 2017, ISBN... Read More...
Low-Molecular-Weight Hydrogels as New Supramolecular Materials for Bioelectrochemical Interfaces
vendredi 19 mai 2017
D. Jain, A. Karajic, M. Murawska, B. Goudeau, S. Bichon, S. Gounel, N. Mano, A. Kuhn, P. Barthélémy ACS Appl. Mater. Interfaces, 2017, 9, 1093–1098 Controlling the interface between... Read More...
Miniaturized Electrochemical Device from Assembled Cylindrical Macroporous Gold Electrodes
vendredi 19 mai 2017
A. Karajic, S. Reculusa, S. Ravaine, N. Mano, A. Kuhn ChemElectroChem 2016, 3, 2031 – 2035 To design original electrochemical devices, self-assembly and growth processes can be... Read More...
Full-Spectral Multiplexing of Bioluminescence Resonance Energy Transfer in Three TRPV Channels
vendredi 19 mai 2017
H. J. Ruigrok, G. Shahid, B. Goudeau, F. Poulletier de Gannes,E. Poque-Haro, A. Hurtier, I. Lagroye, P. Vacher, S. Arbault, N. Sojic, B. Veyret, Y. Percherancier Biophysical Journal, 2017, 112,... Read More...