Effect of Cs2CO3 in Li/K and Li/Na carbonate on the oxygen reduction reaction for MCFC

Min Goo Kang, Hyun S. Park, Hyung Chul Ham, Seong Cheol Jang, Chang Won Yoon, Jonghee Han, SukWoo Nam, Sung Hyun Kim, Sung Pil Yoon

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Abstract

Electrolyte properties are significantly important for the long-term stability and performance ofmolten carbonate fuel cells (MCFCs). The Li/Na carbonate is considered an attractive electrolyte for MCFCs due to its high ionic conductivity and low volatility. However, low oxygen solubility is a serious drawback in Li/Na carbonate electrolytes, which hinders the oxygen reduction reaction (ORR) at theMCFC cathode. Several additives have been found to enhance the oxygen solubility in alkali carbonate electrolytes. In this study, the effect of Cs2CO3 in Li/Na and Li/K carbonate mixtures was investigated by cyclic voltammetry and electrochemical impedance spectroscopy. The oxygen reduction activity improved with the increasing Cs concentration (1, 3, and 5 mol%) in all the studied carbonate melts. The addition of Cs2CO3 (5 mol%) to the Li/Na carbonate (68.0/32.0) resulted in an approximately 30% increase of the mass transfer parameter (C0 D0) of the dissolved oxygen species from 0.99 × 10-9 to 1.29 × 10-9 mol/cm2 s1/2 at 620°C. The changes in the ionic conductivity of the molten electrolytes with the Cs additive were also studied.

Original languageEnglish
Pages (from-to)F962-F967
JournalJournal of the Electrochemical Society
Volume163
Issue number8
DOIs
Publication statusPublished - 2016

ASJC Scopus subject areas

  • Electrochemistry
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

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