Journal of Electrochemical Science and Technology

  • 제12권1호
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  • Pages.159-165
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  • 2021
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  • 2093-8551(pISSN)
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  • 2288-9221(eISSN)
한국전기화학회 (The Korean Electrochemical Society)
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Improving the Stability of Series-Connected Solid Oxide Fuel Cells by Modifying the Electrolyte Composition

  • Kim, Young Je (Department of Materials Convergence and System Engineering, Changwon National University) ;
  • Lim, Hyung-Tae (Department of Materials Convergence and System Engineering, Changwon National University)
  • 투고 : 2020.08.28
  • 심사 : 2020.10.06
  • 발행 : 2021.02.28
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초록

YSZ based anode supported solid oxide fuel cells (SOFCs) were prepared, and two cells with different electrolyte thicknesses were connected in series for the simulation of a cell-imbalanced fuel cell stack. Pure YSZ cells in a series connection exhibited a rapid degradation when a thick electrolyte cell was operated under a negative voltage. On the other hand, ceria added-YSZ cells in a series connection were stable under similar operating conditions, and the power density and impedance were about the same as those before tests. The improved stability was due to the reduction of internal partial pressure in the electrolyte by locally increasing the electronic conduction. Thus, we propose a new protection method, i.e., the local addition of ceria in the YSZ electrolyte, to extend the lifetime of a cell-imbalanced SOFC stack.

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