Electrocrystallization of calcium carbonate on carbon-based electrodes

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Abstract

Calcium carbonate was deposited by electrochemical reduction of oxygen to hydroxyl ions at various carbon-based electrodes. Although some vaterite was observed during earlier stages of the electrodeposition, the predominant polymorph during later stages was calcite. The average crystal size reached a value of 15 μm after 10 h at a glassy carbon electrode but the crystal growth rate was substantially accelerated when oxygen was catalytically reduced. The same average size of the calcite crystals in this case (Pt/C electrode) was reached within a period of 1.5 h. Efficient removal of CaCO3 from water was demonstrated when using a porous aerogel carbon electrode and a potential sufficiently negative to promote reduction of water molecules within the pores.

Original languageEnglish
Pages (from-to)195-202
Number of pages8
JournalJournal of Electroanalytical Chemistry
Volume575
Issue number2
DOIs
StatePublished - 1 Feb 2005

Keywords

  • Calcium carbonate
  • Carbon electrodes
  • Crystallization
  • Electrochemical
  • Precipitation
  • Scaling

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering (all)
  • Electrochemistry

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