Effects of layer-by-layer coating on activated carbon electrodes for capacitive deionization Orozco Barrera, Sergio Iglesias Salto, Guillermo Ramón Delgado Mora, Ángel Vicente García Larios, Sergio Ahualli Yapur, Silvia Alejandra Recently, the need for obtaining, reusing, or purifying water has become a crucial issue. The capacitive deionization (CDI) method, which is based on the electric double layer (EDL) concept, can be applied to ion adsorption from an aqueous solution. This process is carried out by applying a potential difference to highly porous electrodes while pumping salty solution between them, partially removing the ions present in the solution and keeping them in the surface of the electrodes. The use of coated carbon electrodes with one polyelectrolyte layer, turning them into “soft electrodes” (SEs), has been proved to improve the efficiency of the system with respect to its original configuration. In this work, we investigate the effect on the ion adsorption and the efficiency of the process when implementing the coating technique known as layer-by-layer (LbL) on the electrode. This consists in successively coating the electrode surfaces with polyelectrolyte layers, alternating their charge polarity in each step. We tested the effect of the number of layers deposited, as well as the impact of this technique by using different carbons. We found that the second polyelectrolyte layer adheres more than the first layer, serving as a support or seed when it is not dense and uniformly distributed. In contrast, if the first layer is well adhered, a third layer is needed to observe improvements in adsorption and process efficiency. The adsorption of the polymer layers depends in any instance on the porosity of the carbon. 2023-05-09T09:45:56Z 2023-05-09T09:45:56Z 2023-02-21 info:eu-repo/semantics/article Phys. Chem. Chem. Phys., 2023, 25, 9482[DOI: 10.1039/d2cp05682h] https://hdl.handle.net/10481/81405 10.1039/d2cp05682h eng info:eu-repo/grantAgreement/EC/NextGenerationEU/PRTR/ED2021-131855B-I00/AEI/10.13039/501100011033 http://creativecommons.org/licenses/by-nc/4.0/ info:eu-repo/semantics/openAccess Atribución-NoComercial 4.0 Internacional Royal Society Of Chemistry