Highly conductive colloidal carbon based suspension for flow-assisted electrochemical systems
Marco S. Alfonso,
Hélène Parant,
Jinkai Yuan,
Wilfrid Neri,
Eric Laurichesse,
Katerina Kampioti,
Annie Colin,
Philippe Poulin
Affiliations
Marco S. Alfonso
Centre de Recherche Paul Pascal, CNRS, Université de Bordeaux, 115 Avenue Schweitzer, 33600, Pessac, France
Hélène Parant
Centre de Recherche Paul Pascal, CNRS, Université de Bordeaux, 115 Avenue Schweitzer, 33600, Pessac, France
Jinkai Yuan
Centre de Recherche Paul Pascal, CNRS, Université de Bordeaux, 115 Avenue Schweitzer, 33600, Pessac, France
Wilfrid Neri
Centre de Recherche Paul Pascal, CNRS, Université de Bordeaux, 115 Avenue Schweitzer, 33600, Pessac, France
Eric Laurichesse
Centre de Recherche Paul Pascal, CNRS, Université de Bordeaux, 115 Avenue Schweitzer, 33600, Pessac, France
Katerina Kampioti
Centre de Recherche Paul Pascal, CNRS, Université de Bordeaux, 115 Avenue Schweitzer, 33600, Pessac, France
Annie Colin
Centre de Recherche Paul Pascal, CNRS, Université de Bordeaux, 115 Avenue Schweitzer, 33600, Pessac, France; Université PSL, MIE-CBI ESPCI Paris 10 Rue Vauquelin, Paris 75005, France
Philippe Poulin
Centre de Recherche Paul Pascal, CNRS, Université de Bordeaux, 115 Avenue Schweitzer, 33600, Pessac, France; Corresponding author
Summary: Carbon suspension electrodes are promising for flow-assisted electrochemical energy storage systems. They serve as flowable electrodes in electrolyte solutions of flow batteries, or flow capacitors. They can also be used for other applications such as capacitive deionization of water. However, developments of such suspensions remain challenging. The suspensions should combine low viscosity and high electronic conductivity for optimized performances. In this work, we report a flowable aqueous carbon dispersion which exhibits a viscosity of only 2 Pa.s at a shear rate of 5 s−1 for a concentration of particles of 7 wt%. This suspension displays an electronic conductivity of 65 mS/cm, nearly two orders of magnitude greater than previously investigated related materials. The investigated suspensions are stabilized by sodium alginate and arabic gum in the presence of ammonium sulfate. Their use in flowable systems for the storage and discharge of electrical charges is demonstrated.