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Capacitive deionization with asymmetric electrodes: Electrode capacitance vs electrode surface area: Electrode capacitance vs electrode surface area
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Functional Materials, FNM. Sultan Qaboos University, Oman.ORCID iD: 0000-0002-0074-3504
2015 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 176, 420-425 p.Article in journal (Refereed) Published
Abstract [en]

Asymmetry of electrodes on the equilibrium salt adsorption capacity in a capacitive configuration was studied. Experiments were carried out by using activated carbon cloth (ACC) with a specific surface area and specific capacitance of similar to 1000 m(2)/g and 44 F/g as the anode and ACC coated with zinc oxide nanorods (ZnO NR) with a specific surface area and specific capacitance of 637 m(2)/g and 57 F/g as the cathode. The electrodes were characterized electrically and their salt adsorption capacities measured for various anode-cathode configurations to conclude that for multimodal electrodes, specific capacitance and not specific surface area regulates the salt adsorption capacity. The adsorption trends were analyzed and equated to an electrical model to qualitatively predict the equilibrium salt adsorption capacity, where the smaller capacitance was observed to be the limiting factor. The results in this work are especially useful for practical CDI units, where anode-cathode capacitance should be matched to achieve maximum salt removal efficiency.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 176, 420-425 p.
Keyword [en]
Electrode asymmetry, Specific capacitance, Capacitive deionization, Zinc Oxide, Activated carbon cloth
National Category
Other Chemistry Topics Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-174219DOI: 10.1016/j.electacta.2015.07.036ISI: 000360918000053Scopus ID: 2-s2.0-84937206297OAI: oai:DiVA.org:kth-174219DiVA: diva2:860953
Note

QC 20151014

Available from: 2015-10-14 Created: 2015-10-02 Last updated: 2017-12-01Bibliographically approved

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Dutta, Joydeep

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