Using oxygen plasma treatment to improve the performance of electrodes for capacitive water deionization

Pejman Hojati-Talemi, Linda Zou, Manrico Fabretto, Robert D. Short

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

An oxygen plasma treatment was employed to modify the surface of carbon electrodes used in capacitive deionization (CDI). X-ray photoelectron spectroscopy analysis of samples showed that oxygen plasma is mainly attaching oxygenated groups on the PTFE binder used in these electrodes. By functionalizing the binder it can increase the hydrophilicity of the electrode surface and increase the available specific surface area. 2.5 min of plasma treatment resulted in the largest improvement of CDI performance of electrodes. Thermodynamic study of CDI performance showed that the modified electrodes followed Langmuir and Freundlich isotherms resulting from the increased interaction between the enhanced electrodes and water. The kinetic study showed that the CDI process followed a pseudo-first order adsorption kinetics. The calculated adsorption rate constants suggested that plasma modification can accelerate ion adsorption of electrodes.

Original languageBritish English
Pages (from-to)494-499
Number of pages6
JournalElectrochimica Acta
Volume106
DOIs
StatePublished - 2013

Keywords

  • Activated carbon
  • Capacitive deionization
  • Oxygen plasma

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