Please use this identifier to cite or link to this item: doi:10.22028/D291-29116
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Title: Pseudocapacitive Desalination of Brackish Water and Seawater with Vanadium-Pentoxide-Decorated Multiwalled Carbon Nanotubes
Author(s): Lee, Juhan
Srimuk, Pattarachai
Aristizabal, Katherine
Kim, Choonsoo
Choudhury, Soumyadip
Nah, Yoon-Chae
Mücklich, Frank
Presser, Volker
Language: English
Title: ChemSusChem : chemistry & sustainability, energy & materials
Volume: 10
Issue: 18
Startpage: 3611
Endpage: 3623
Publisher/Platform: Wiley
Year of Publication: 2017
Publikation type: Journal Article
Abstract: A hybrid membrane pseudocapacitive deionization (MPDI) system consisting of a hydrated vanadium pentoxide (hV2 O5 )-decorated multi-walled carbon nanotube (MWCNT) electrode and one activated carbon electrode enables sodium ions to be removed by pseudocapacitive intercalation with the MWCNT-hV2 O5 electrode and chloride ion to be removed by non-faradaic electrosorption of the porous carbon electrode. The MWCNT-hV2 O5 electrode was synthesized by electrochemical deposition of hydrated vanadium pentoxide on the MWCNT paper. The stable electrochemical operating window for the MWCNT-hV2 O5 electrode was between -0.5 V and +0.4 V versus Ag/AgCl, which provided a specific capacity of 44 mAh g-1 (corresponding with 244 F g-1 ) in aqueous 1 m NaCl. The desalination performance of the MPDI system was investigated in aqueous 200 mm NaCl (brackish water) and 600 mm NaCl (seawater) solutions. With the aid of an anion and a cation exchange membrane, the MPDI hybrid cell was operated from -0.4 to +0.8 V cell voltage without crossing the reduction and oxidation potential limit of both electrodes. For the 600 mm NaCl solution, the NaCl salt adsorption capacity of the cell was 23.6±2.2 mg g-1 , which is equivalent to 35.7±3.3 mg g-1 normalized to the mass of the MWCNT-hV2 O5 electrode. Additionally, we propose a normalization method for the electrode material with faradaic reactions based on sodium uptake capacities.
DOI of the first publication: 10.1002/cssc.201701215
URL of the first publication: https://chemistry-europe.onlinelibrary.wiley.com/doi/abs/10.1002/cssc.201701215
Link to this record: hdl:20.500.11880/27996
http://dx.doi.org/10.22028/D291-29116
ISSN: 1864-564X
Date of registration: 2-Oct-2019
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Materialwissenschaft und Werkstofftechnik
Professorship: NT - Prof. Dr. Volker Presser
Collections:UniBib – Die Universitätsbibliographie

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