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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/33063

Title: Effect of Solution Composition on the Energy Production by Capacitive Mixing in Membrane-Electrode Assembly
Authors: Ahualli, Silvia
Fernández, M. Mar
Iglesias, Guillermo R.
Jiménez Olivares, María Luisa
Liu, Fei
Vagterfeld, Martijn
Delgado, Ángel V.
Issue Date: 2014
Abstract: In this work we consider the extent to which the presence of multi-valent ions in solution modifies the equilibrium and dynamics of the energy production in a capacitive cell built with ion-exchange membranes in contact with high surface area electrodes. The cell potential in open circuit (OCV) is controlled by the difference between both membrane potentials, simulated as constant volume charge regions. A theoretical model is elaborated for steady state OCV, first in the case of monovalent solutions, as a reference. This is compared to the results in multi-ionic systems, containing divalent cations in concentrations similar to those in real sea water. It is found that the OCV is reduced by about 25 % (as compared to the results in pure NaCl solutions) due to the presence of the divalent ions, even in low concentrations. Interestingly, this can be related to the “uphill” transport of such ions against their concentration gradients. On the contrary, their effect on the dynamics of the cell potential is negligible in the case of highly charged membranes. The comparison between model predictions and experimental results shows a very satisfactory agreement, and gives clues for the practical application of these recently introduced energy production methods.
Sponsorship: The research leading to these results received funding from the European Union 7th Framework Programme (FP7/2007-2013) under agreement No. 256868. Further financial support from Junta de Andalucia, Spain (PE2012-FQM 694) is also acknowledged. One of us, M.M.F., received financial support throughan FPU grant from the Universityof Granada.
Publisher: American Chemical Society
Description: The final edited version of the paper can be found at: http://pubs.acs.org/articlesonrequest/AOR-c9UMxSzGY3eiU5SENNgT The complete citation is: Ahualli, S.; et al. Effect of Solution Composition on the Energy Production by Capacitive Mixing in Membrane-Electrode Assembly. Journal of Physical Chemistry, 118(29): 15590-15599 (2014). DOI:10.1021/jp504461m
Open access in the Journal on May 26, 2015
Keywords: Activated carbon particles
Blue energy
Capacitive energy extraction
Donnan potential
Ionic exchange membranes
Multivalent solutions
URI: http://hdl.handle.net/10481/33063
ISSN: 1932-7447
Appears in Collections:OpenAIRE (Open Access Infrastructure for Research in Europe)

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