Performance Recovery in Degraded Carbon-Based Electrodes for Capacitive Deionization

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Bei Li
  • Tianye Zheng
  • Sijia Ran
  • Haibo Hu
  • Po-Heng Lee
  • Steven T. Boles

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)1848-1856
Journal / PublicationEnvironmental Science and Technology
Volume54
Issue number3
Online published30 Dec 2019
Publication statusPublished - 4 Feb 2020

Abstract

Limitations of capacitive deionization (CDI) and future commercialization efforts are intrinsically bound to electrode stability. In this work, thermal treatments are explored to understand their ability to regenerate aged CDI electrodes. We demonstrate that a relatively low thermal treatment temperature of ∼500 °C can sufficiently recover the lost salt adsorption capacity of degraded electrodes. Furthermore, a systematic study of electrode replacement clarifies that the desalination ability loss and regeneration for a CDI cell are isolated to the aged anode, as expected. Characterizations of surface functionalities support that the acidic oxygen-containing functional groups formed in situ during cycling undergo thermal decomposition during treatment. The modified Donnan model quantitatively confirms that the surface charges originate from the formation/decomposition of functional groups. Accordingly, the lost pore volume and the increased resistance are recovered during thermal treatments, while the surface morphologies and pore structure of the electrodes are well-preserved. Therefore, thermal treatment can be applied practically to extend the lifetime of aged electrodes. This study also offers insights into strategies for minimizing electrode degradation or in situ regeneration such that the technology gains momentum for future commercialization.

Bibliographic Note

Full text of this publication does not contain sufficient affiliation information. With consent from the author(s) concerned, the Research Unit(s) information for this record is based on the existing academic department affiliation of the author(s).

Citation Format(s)

Performance Recovery in Degraded Carbon-Based Electrodes for Capacitive Deionization. / Li, Bei; Zheng, Tianye; Ran, Sijia; Sun, Mingzhe; Shang, Jin; Hu, Haibo; Lee, Po-Heng; Boles, Steven T.

In: Environmental Science and Technology, Vol. 54, No. 3, 04.02.2020, p. 1848-1856.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review