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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/33396

Title: Modification of the surface of activated carbon electrodes for capacitive mixing energy extraction from salinity differences
Authors: Marino, Massimo
Misuri, Lorenza
Jiménez, María L.
Ahualli, Silvia
Kozynchenko, Oleksei
Tennison, Steve
Bryjak, Marek
Brogioli, Doriano
Issue Date: 2014
Abstract: The “capacitive mixing” (CAPMIX) is one of the techniques aimed at the extraction of energy from the salinity difference between sea and rivers. It is based on the rise of the voltage between two electrodes, taking place when the salt concentration of the solution in which they are dipped is changed. We study the rise of the potential of activated carbon electrodes in NaCl solutions, as a function of their charging state. We evaluate the effect of the modification of the materials obtained by adsorption of charged molecules. We observe a displacement of the potential at which the potential rise vanishes, as predicted by the electric double layer theories. Moreover, we observe a saturation of the potential rise at high charging states, to a value that is nearly independent of the analyzed material. This saturation represents the most relevant element that determines the performances of the CAPMIX cell under study; we attribute it to a kinetic effect.
Sponsorship: Departamento de Física Aplicada
Publisher: Elsevier
Description: This is an unedited version of this article. The publisher's edited version cab reached in this URL: http://www.sciencedirect.com/science/article/pii/S0021979714006274#
The reference for this article is: Marino et al., Journal of Colloid and Interface Science 436(2014) 146-153.
Keywords: Energy from salinity difference
Surface groups
Capacitive mixing
Electric double layer
Gouy-Chapman-Stern model
URI: http://hdl.handle.net/10481/33396
Citation: Marino, M.; et al. Modification of the surface of activated carbon electrodes for capacitive mixing energy extraction from salinity differences. Journal of Colloid and Interface Science, 436(2014), 146-153.[http://hdl.handle.net/10481/33396]
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