Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Current Collector Effects on High Temperature Electrolysis by NI-YSZ Cermet Supported Solid Oxide Cells

집전체에 따른 NI-YSZ Cermet 기반의 가역적 고체산화물 연료전지를 이용한 고온 수증기 전기분해 특성

  • Shin, Eui-Chol (School of Materials Science and Engineering, Chonnam National University) ;
  • Ahn, Pyung-An (School of Materials Science and Engineering, Chonnam National University) ;
  • Seo, Hyun-Ho (School of Materials Science and Engineering, Chonnam National University) ;
  • Lee, Jong-Sook (School of Materials Science and Engineering, Chonnam National University) ;
  • Yu, Ji-Haeng (Korea Institute of Energy Research) ;
  • Woo, Sang-Kuk (Korea Institute of Energy Research)
  • Received : 2010.10.13
  • Accepted : 2010.12.17
  • Published : 2010.12.31
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Abstract

Ni-YSZ supported button cells were prepared by spray-coating YSZ and screen-printing YSZ-LSM powder as an electrolyte and oxygen electrode on Ni-YSZ cermet disks. In order to identify the polarization loss mechanism in high temperature electrolysis current-voltage characteristics coupled with electrochemical impedance spectroscopy were investigated as a function of temperature, current load, and the humidity. The effects of the different current collectors of platinum and silver for oxygen electrodes were compared. With Ag current collector two polarization losses were distinguished. The high frequency component was attributed to the Ni-YSZ cermet which was less susceptible to temperature variation but increasing in loss with humidity. The lower frequency component was attributed to the LSM electrode. Platinum current collector led to a much lower polarization loss.

Keywords

References

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