Dependence of the capacitive deionization performance on potential of zero charge shifting of carbon xerogel electrodes during long-term operation

Xin Gao, Ayokunle Omosebi, James Landon, Kunlei Liu

Research output: Contribution to journalArticlepeer-review

90 Scopus citations

Abstract

In order to examine the reliability of carbon xerogel (CX) materials for capacitive deionization (CDI), long-term operation of a CDI cell with CX electrodes was performed in a dilute NaCl solution. During operation at 1.2/0 V, the deionization performance gradually degraded, and a growing inversion peak formed at the beginning of each adsorption step. When the polarity of the electrode was reversed, the use of -1.2/0 V significantly boosted deionization performance. However, this enhancement was not sustained with continued cycling. In this study, we also reported the use of a four-electrode cell, in which the potential distribution for a pair of electrodes could be measured, and the potential of zero charge (PZC) for a single electrode could be located. Based upon the PZC location for the used electrodes with respect to the corresponding potential distribution, performance variation and the formation of the inversion peak for long-term CDI operation were interpreted. In addition, N2 adsorption-desorption measurements and surface morphology examinations indicated that there was little variation in the porosity of the cycled electrodes with long-term operation.

Original languageEnglish
Pages (from-to)E159-E166
JournalJournal of the Electrochemical Society
Volume161
Issue number12
DOIs
StatePublished - 2014

Bibliographical note

Publisher Copyright:
© 2014 The Electrochemical Society. All rights reserved.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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