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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/33397

Title: Temperature effects on energy production by salinity exchange
Authors: Ahualli, Silvia
Fernández, M. Mar
Iglesias, Guillermo R.
Delgado, Ángel V.
Jiménez Olivares, María Luisa
Issue Date: 2014
Abstract: In recent years, the capacitance of the interface between charged electrodes and ionic solutions (the electric double layer) has been investigated as a source of clean energy. Charge is placed on the electrodes either by means of ion-exchange membranes or of an external power source. In the latter method, net energy is produced by simple solution exchange in open circuit, due to the associated decrease in the capacitance of the electric double layer. In this work, we consider the change in capacitance associated with temperature variations: the former decreases when temperature is raised, and, hence, a cycle is possible in which some charge is put on the electrode at a certain potential and returned at a higher one. We demonstrate experimentally that it is thus viable to obtain energy from electric double layers if these are successively contacted with water at different temperatures. In addition, we show theoretically and experimentally that temperature and salinity variations can be conveniently combined to maximize the electrode potential increase. The resulting available energy is also estimated.
Sponsorship: Departamento de Física Aplicada
The research leading to these results received funding from the European Union 7th Frame-work Programme (FP7/2007-2013) under agreement No. 256868. Further Financial supports from Junta de Andalucía, project FQM 694, and Ministerio de Economía y Competitividad (Spain), project FIS2013-47666-C3-1-R.
Publisher: American Chemical Society
Description: This is an unedited version of this paper. The publisher version can be reached in this URL: http://pubs.acs.org/doi/abs/10.1021/es500634f
Keywords: Electric double layer
Blue energy
Temperature and salinity gradient
URI: http://hdl.handle.net/10481/33397
ISSN: 1520-5851
Citation: Ahualli, S.; et al. Temperature effects on energy production by salinity exchange. Environmental Science and Technology, (2014). [http://hdl.handle.net/10481/33397]
Appears in Collections:OpenAIRE (Open Access Infrastructure for Research in Europe)

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