Please use this identifier to cite or link to this item: doi:10.22028/D291-28900
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Title: Charge and Potential Balancing for Optimized Capacitive Deionization Using Lignin-Derived, Low-Cost Activated Carbon Electrodes
Author(s): Zornitta, Rafael Linzmeyer
Srimuk, Pattarachai
Lee, Juhan
Krüner, Benjamin
Aslan, Mesut
Ruotolo, Luis Augusto Martins
Presser, Volker
Language: English
Title: ChemSusChem
Volume: 11
Issue: 13
Startpage: 2101
Endpage: 2113
Publisher/Platform: Wiley
Year of Publication: 2018
Publikation type: Journal Article
Abstract: Lignin-derived carbon is introduced as a promising electrode material for water desalination by using capacitive deionization (CDI). Lignin is a low-cost precursor that is obtained from the cellulose and ethanol industries, and we used carbonization and subsequent KOH activation to obtain highly porous carbon. CDI cells with a pair of lignin-derived carbon electrodes presented an initially high salt adsorption capacity but rapidly lost their beneficial desalination performance. To capitalize on the high porosity of lignin-derived carbon and to stabilize the CDI performance, we then used asymmetric electrode configurations. By using electrodes of the same material but with different thicknesses, the desalination performance was stabilized through reduction of the potential at the positive electrode. To enhance the desalination capacity further, we used cell configurations with different materials for the positive and negative electrodes. The best performance was achieved by a cell with lignin-derived carbon as a negative electrode and commercial activated carbon as a positive electrode. Thereby, a maximum desalination capacity of 18.5 mg g-1 was obtained with charge efficiency over 80 % and excellent performance retention over 100 cycles. The improvements were related to the difference in the potential of zero charge between the electrodes. Our work shows that an asymmetric cell configuration is a powerful tool to adapt otherwise inappropriate CDI electrode materials.
DOI of the first publication: 10.1002/cssc.201800689
URL of the first publication: https://onlinelibrary.wiley.com/doi/full/10.1002/cssc.201800689
Link to this record: hdl:20.500.11880/27803
http://dx.doi.org/10.22028/D291-28900
ISSN: 1864-564X
1864-5631
Date of registration: 17-Sep-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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