Journal of Industrial and Engineering Chemistry

  • Volume 68
  • /
  • Pages.187-195
  • /
  • 2018
  • /
  • 1226-086X(pISSN)
  • /
  • 1876-794X(eISSN)
The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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H2S tolerance effects of Ce0.8Sm0.2O2-δ modification on Sr0.92Y0.08Ti1-xNixO3-δ anode in solid oxide fuel cells

  • Kim, Kab In (School of Chemical Engineering, Chonnam National University) ;
  • Kim, Hee Su (Department of Green Technology Research, Korea Construction Equipment Technology Institute) ;
  • Kim, Hyung Soon (School of Chemical Engineering, Chonnam National University) ;
  • Yun, Jeong Woo (School of Chemical Engineering, Chonnam National University)
  • Received : 2018.01.25
  • Accepted : 2018.07.26
  • Published : 2018.12.25
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Abstract

$Sr_{0.92}Y_{0.08}Ti_{1-x}Ni_xO_{3-{\delta}}$ (SYTN) was investigated in the presence of $H_2S$ containing fuels to assess the feasibility of employing oxide materials as alternative anodes. Aliovalent substitution of $Ni^{2+}$ into $Ti^{4+}$ increased the ionic conductivity of perovskite, leading to improved electrochemical performance of the SYTN anode. The maximum power densities were 32.4 and $45.3mW/cm^2$ in $H_2$ at $900^{\circ}C$ for the SYT anode and the SYTN anode, respectively. However, the maximum power densities in 300 ppm of $H_2S$ decreased by 7% and by 46% in the SYT and the SYTN anodes, respectively. To enhance the sulfur tolerance and to improve the electrochemical properties, the surface of SYTN anode was modified with samarium doped ceria (SDC) using the sol-gel coating method. For the SDC-modified SYTN anode, the cell performance was mostly recovered in the pure $H_2$ condition after 500-ppm $H_2S$ exposure in contrast to the irreversible cell performance degradation exhibited in the unmodified SYTN anode.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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