title: Impact of wire geometry in energy extraction from salinity differences using capacitive technology.
abstract: Energy extraction based on capacitive Donnan potential (CDP) is a recently suggested technique for sustainable power generation. CDP combines the use of ion-exchange membranes and porous carbon electrodes to convert the Gibbs free energy of mixing sea and river water into electric work. The electrodes geometry has a relevant impact on internal resistance and overall performance in CDP. In this work, we present the first effort to use wire-shaped electrodes and its suitability for improving CDP. Analytical evaluation and electrical measurements confirm a strong nonlinear decrease in internal resistance for distances between electrodes smaller than 3 mm. We also demonstrated that we get more power per material invested when compared to traditional flat plate designs. These findings show the advantages of this design for further development of CDP into a mature technology.
authors.affiliation: Sub-Department of Environmental Technology, Wageningen University, Bornse Weilanden 9, 6708 WG Wageningen, The Netherlands.
authors.forename: Bruno B
authors.initials: BB
authors.lastname: Sales
authors.forename: Odne S
authors.initials: OS
authors.lastname: Burheim
authors.forename: Fei
authors.initials: F
authors.lastname: Liu
authors.forename: Olivier
authors.initials: O
authors.lastname: Schaetzle
authors.forename: Cees J N
authors.initials: CJ
authors.lastname: Buisman
authors.forename: Hubertus V M
authors.initials: HV
authors.lastname: Hamelers
mesh_terms: D025802:Electric Capacitance; D004566:Electrodes; D004736:Energy-Generating Resources; D005618:Fresh Water; D054712:Salinity; D012623:Seawater