Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Sulfur Poisoning of Ni Anode as a Function of Operating Conditions in Solid Oxide Fuel Cells

고체산화물 연료전지의 운전 조건에 따른 니켈 전극 황 피독 현상

  • Lee, Ho Seong (School of Materials Science and Engineering, Changwon National University) ;
  • Lee, Hyun Mi (School of Materials Science and Engineering, Changwon National University) ;
  • Lim, Hyung-Tae (School of Materials Science and Engineering, Changwon National University)
  • 이호성 (창원대학교신소재공학부) ;
  • 이현미 (창원대학교신소재공학부) ;
  • 임형태 (창원대학교신소재공학부)
  • Received : 2018.09.11
  • Accepted : 2018.10.16
  • Published : 2018.12.05
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Abstract

In the present study, we investigated the sulfur poisoning of the Ni anode in solid oxide fuel cells (SOFCs) as a function of operating conditions. Anode supported cells were fabricated, and sulfur poising tests were conducted as a function of current density, $H_2S$ concentration and humidity in the anode gas. The voltage drop was significant under the higher current density (${\sim}714mA/cm^2$) condition, while it was much reduced under the lower current density (${\sim}389mA/cm^2$) condition, at 100 ppm of $H_2S$. A secondary voltage drop, which occurred only at the high current density, was attributed to Ni oxidation in the anode. Thus, operation at high current density with high $H_2S$ concentration may lead to permanent deterioration in the anode. The effect of water content (10%) on the sulfur poisoning was also investigated through a constant current test (${\sim}500mA/cm^2$) at 10 ppm of $H_2S$. The cell operating with 10% wet anode gas showed a much smaller initial voltage drop, in comparison with a dry anode gas. The present study indicates that operating conditions, such as gas humidity and current density, should be carefully taken into account, especially when fuel cells are operated with $H_2S$ containing fuel.

Keywords

Acknowledgement

Supported by : 창원대학교

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