Enhancement in ion adsorption rate and desalination efficiency in a capacitive deionization cell through improved electric field distribution using electrodes composed of activated carbon cloth coated with zinc oxide nanorods

Karthik Laxman, Myo Tay Zar Myint, Hadj Bourdoucen, Joydeep Dutta

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Electrodes composed of activated carbon cloth (ACC) coated with zinc oxide (ZnO) nanorods are compared with plain ACC electrodes, with respect to their desalination efficiency of a 17 mM NaCl solution at different applied potentials. Polarization of the ZnO nanorods increased the penetration depth and strength of the electric field between the electrodes, leading to an increase in the capacitance and charge efficiency at reduced input charge ratios. Uniform distribution of the electric field lines between two electrodes coated with ZnO nanorods led to faster ion adsorption rates, reduced the electrode saturation time, and increased the average desalination efficiency by ∼45% for all applied potentials. The electrodes were characterized for active surface area, capacitance from cyclic voltammetry, theoretical assessment of surface area utilization, and the magnitude of electric field force acting on an ion of unit charge for each potential.

Original languageEnglish
Pages (from-to)10113-10120
Number of pages8
JournalACS Applied Materials and Interfaces
Volume6
Issue number13
DOIs
Publication statusPublished - Jul 9 2014

Keywords

  • activated carbon cloth
  • capacitive deionization
  • charge efficiency
  • electric field
  • zinc oxide

ASJC Scopus subject areas

  • Materials Science(all)

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