Side Reactions in Capacitive Deionization (CDI) Processes: The Role of Oxygen Reduction

Barak Shapira, Eran Avraham, Doron Aurbach

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94 Scopus citations

Abstract

This paper aims at analyzing the impact of irreversible faradaic side reactions and, in particular, oxygen reduction on capacitive deionization (CDI) processes. As opposed to electrochemical supercapacitors, the presence of dissolved oxygen in the feed stream is unavoidable and requires appropriate attention. By constructing simple two- and three-electrode cells, comprising untreated activated carbon cloth, aerogel, and hydrogen-treated activated carbon cloth, we show that the rate at which oxygen is reduced at the active site of the electrodes has significant impact on the cell parameters and, in particular, the potential distribution with respect to its initial state. This has impact on the endurance of the electrodes during long-term cycling. The rate and mechanism of the oxygen catalytic reaction on the carbon electrode is evaluated by adopting the self-discharge model suggested by Conway [1].

Original languageEnglish
Pages (from-to)285-295
Number of pages11
JournalElectrochimica Acta
Volume220
DOIs
StatePublished - 1 Dec 2016

Bibliographical note

Publisher Copyright:
© 2016 Elsevier Ltd

Keywords

  • activated carbon electrodes
  • capacitive deionization (CDI)
  • electro-adsorption
  • oxygen reduction reaction (ORR)

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