Polyelectrolyte-coated carbons used in the generation of blue energy from salinity differences Ahualli Yapur, Silvia Alejandra Jiménez Olivares, María Luisa Fernández, M. Mar Iglesias Salto, Guillermo Ramón Brogioli, Doriano Delgado Mora, Ángel Vicente Blue energy Salinity exchange Polyelectrolyte coating Activated carbon Donnan potential Soft particles This is the unedited version of this manuscript. The publisher's edited version can be reached at this URL: http://pubs.rsc.org/en/content/articlelanding/2014/cp/c4cp03527e#!divAbstract In this work we present a method for the production of clean, renewable electrical energy from the exchange of solutions with different salinities. Activated carbon films are coated with negatively or positively charged polyelectrolytes by well-established adsorption methods. When two oppositely charged coated films are placed in contact with an ionic solution, the potential difference between them will be equal to the difference between their Donnan potentials, and hence, energy can be extracted by building an electrochemical cell with such electrodes. A model is elaborated on the operation of the cell, based on the electrokinetic theory of soft particles. All the features of the model are experimentally reproduced, although a small quantitative difference concerning the maximum opencircuit voltage is found, suggesting that the coating is the key point to improve the efficiency. In the used experimental conditions, we obtain a power of 12.1 mW/m2. Overall, the method proves to be a fruitful and simple approach to salinity-gradient energy production. Obtaining energy from salinity differences as 2014-10-10T08:22:51Z 2014-10-10T08:22:51Z 2014 info:eu-repo/semantics/article Ahualli, S.; et al. Polyelectrolyte-coated carbons used in the generation of blue energy from salinity differences. Physical Chemistry Chemical Physics, (2014). [http://hdl.handle.net/10481/33398] 1463-9076 http://hdl.handle.net/10481/33398 10.1039/C4CP03527E eng info:eu-repo/grantAgreement/EC/FP7/256868 info:eu-repo/semantics/openAccess Royal Society of Chemistry