Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 498480
Title Parallel up-scaling of Capacitive Mixing (CapMix) system enhances the specific performance
Author(s) Liu, Fei; Donkers, Tim F.W.; Wagterveld, R.M.; Schaetzle, Olivier; Saakes, Michel; Buisman, Cees J.N.; Hamelers, Hubertus V.M.
Source Electrochimica Acta 187 (2016). - ISSN 0013-4686 - p. 104 - 112.
DOI http://dx.doi.org/10.1016/j.electacta.2015.10.196
Department(s) Sub-department of Environmental Technology
WIMEK
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) Capacitive Donnan Potential - Capacitive Mixing - Ion exchange membrane - Salinity gradient energy - Wire-shaped electrode
Abstract

Given the considerable amount of energy dissipated in the salinity gradient at the point where a river flows into the sea, we investigate the technology of capacitive mixing (CapMix), an attractive technology for generating electrical power from this gradient. We determine the performances of multiple wire-shaped electrode pairs connected either in series or in parallel in a CapMix system. The bundles of pairs were immersed in synthetic river and seawater. Pairs connected in parallel and placed next to each other allowed for 18% more energy extraction than the total energy extracted by the same number of pairs individually. An even higher additional energy gain is possible if contact resistances are further minimized. The improvement is due to the additional flow paths for ions between electrode pairs in parallel connection, reducing the total internal resistance. The highest power density achieved (in terms of the mass of activated carbon material used) was 2.7 mW/g, which was higher than the power densities that have been achieved previously using a flat plate CapMix cell (1.26 mW/g) and a wire electrode cell (0.34 mW/g). The lower ohmic resistance in the parallel system was identified using a current distribution model and experimental measurements.

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