Enhancement of cell performance using a gadolinium strontium cobaltite coated cathode in molten carbonate fuel cells

Shin Ae Song, Seong Cheol Jang, Jonghee Han, Sung Pil Yoon, SukWoo Nam, In Hwan Oh, Tae Hoon Lim

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

To enhance cathode performance, gadolinium strontium cobaltite (Gd 0.6Sr 0.4CoO 3, GSC) is coated onto a porous Ni plate by a vacuum suction method, for use as the cathode in molten carbonate fuel cells (MCFCs). GSC is a mixed ionic and electronic conductor (MIEC) material, and thus has high electronic conductivity and catalytic activity at low temperatures. The electrode performance of the GSC-coated cathode is examined by various methods, such as single cell operation and electrochemical impedance spectroscopy (EIS). At 600 °C, the performance of a single cell using a GSC-coated cathode is 0.813 V. This result is very surprising given that the performance of an uncoated conventional cathode is 0.69 V. Impedance analysis confirms that a dramatic decrease in the charge transfer resistance after GSC coating is primarily responsible for the cell enhancement at low temperature. The reaction orders for O 2 and CO 2 at uncoated and GSC-coated cathodes are also examined via a symmetric cell test, to identify the reaction mechanism of oxygen reduction. The peroxide mechanism, which is known to be a fast reaction, is predominant for the GSC-coated cathode at low temperatures, whereas the superoxide mechanism is predominant for the uncoated cathode.

Original languageEnglish
Pages (from-to)9900-9905
Number of pages6
JournalJournal of Power Sources
Volume196
Issue number23
DOIs
Publication statusPublished - 2011 Dec 1

Keywords

  • Gadolinium strontium cobaltite coated cathode
  • High performance
  • Molten carbonate fuel cells
  • Reduction of cathode polarization

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

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