The Conductivity of Aqueous K2CO3 at Elevated Temperatures and Pressures, Measured using the AC van der Pauw Technique

Pia Lolk Mollerup, Ane Sælland Christiansen, Nikolaos Bonanos, Mogens Bjerg Mogensen

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Abstract

Conductivity measurements of aqueous K2CO3 were performed using the van der Pauw method and a specially designed sample holder with Pt wires as electrodes. The resistance was measured using alternating current. The conductivity of 10-50 wt% aqueous K2CO3 was measured at room temperature and ambient pressure. The conductivity was found to increase with concentration up to 30-40 wt%, and decline at higher concentrations. Furthermore, the conductivity of 5-30 wt% aqueous K2CO3 was measured up to 180-200 °C at 30 bar. The highest conductivity measured was 1.34 S/cm at 172 °C for 30 wt% K2CO3 (aq). The conductivity was found to increase with concentration and also temperature for 5-15 wt%. For 20 and 30 wt% K2CO3 (aq) the conductivity also increased with temperature up to a certain point and then a drop was seen at 150 and 180 °C, respectively. The activation energy was also obtained by fitting the data to a modified Arrhenius equation. The activation energy was found to be in the range 0.14-0.17 eV and did not appear to be concentration dependent.
Original languageEnglish
JournalJournal of New Materials for Electrochemical Systems
Volume16
Issue number4
Pages (from-to)279-285
ISSN1480-2422
Publication statusPublished - 2013

Keywords

  • Conductivity
  • K2CO3
  • Aqueous solution
  • Van der Pauw
  • Electrolysis

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