Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Fabrication and Evaluation Properties of Micro-Tubular Solid Oxide Fuel Cells (SOFCs)

마이크로 원통형 SOFC 제작 및 특성평가

  • Kim, Hwan (Department of Advanced Energy Technology, University of Science and Technology) ;
  • Kim, Wan-Je (Hydrogen and Fuel Cell Center, Korea Institute of Energy Research) ;
  • Lee, Jong-Won (Department of Advanced Energy Technology, University of Science and Technology) ;
  • Lee, Seung-Bok (Department of Advanced Energy Technology, University of Science and Technology) ;
  • Lim, Tak-Hyoung (Hydrogen and Fuel Cell Center, Korea Institute of Energy Research) ;
  • Park, Seok-Joo (Hydrogen and Fuel Cell Center, Korea Institute of Energy Research) ;
  • Song, Rak-Hyun (Department of Advanced Energy Technology, University of Science and Technology) ;
  • Shin, Dong-Ryul (Hydrogen and Fuel Cell Center, Korea Institute of Energy Research)
  • 김환 (과학기술연합대학원대학교 신에너지기술전공) ;
  • 김완제 (한국에너지기술연구원 수소연료전지연구단) ;
  • 이종원 (과학기술연합대학원대학교 신에너지기술전공) ;
  • 이승복 (과학기술연합대학원대학교 신에너지기술전공) ;
  • 임탁형 (한국에너지기술연구원 수소연료전지연구단) ;
  • 박석주 (한국에너지기술연구원 수소연료전지연구단) ;
  • 송락현 (과학기술연합대학원대학교 신에너지기술전공) ;
  • 신동열 (한국에너지기술연구원 수소연료전지연구단)
  • Received : 2012.03.10
  • Accepted : 2012.04.20
  • Published : 2012.08.01
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Abstract

In present work, anode support for micro-tubular SOFC was fabricated with outer diameter of 3 mm and characterized with microstructure, mechanical properties and gas permeability. The microstructure of surface and cross section of a porous anode support were analyzed by using SEM (Scanning Electron Microscope) image. The gas permeability and the mechanical strength of anode support was measured and analysed by using differential pressure at the flow rates of 50, 100, 150 cc/min. and using universal testing machine respectively. The unit cell composed of NiO-YSZ, YSZ, YSZ-LSM/LSM/LSCF was fabricated and operated with reaction temperature and fuel flow rate and showed maximum power density of $1095mW/cm^2$ on the condition of $800^{\circ}C$. The performance of single cell for micro-tubular SOFC increased with the increasing the reaction temperature due to the decrement of ohmic resistance of cell by the increment of the ionic conductivity of electrolyte through the evaluation of electrochemical impedance analysis for single cell with reaction temperature.

본 연구에서는 마이크로 원통형 SOFC 지지체의 특성을 평가하기 위해 직경 3 mm의 연료극 지지체를 제조하여 지지체의 미세구조를 분석하고, 기계적 강도 및 가스투과도를 측정하였다. 다공성 연료극 지지체의 표면과 파단면의 미세구조를 분석하기 위해 SEM (Scanning Electron Microscope)을 이용하였다. 지지체의 가스투과도는 차압계를 이용하여 50, 100, 150 cc/min의 유량에서 측정하였으며, 기계적 강도는 만능 시험기를 이용하여 측정하였다. 마이크로 원통형 연료극 지지체의 기본적인 물성 평가 후 NiO-YSZ, YSZ, YSZ-LSM/LSM/LSCF로 구성된 마이크로 SOFC 단위전지를 제조하였으며, 반응온도와 연료 유량별로 성능평가를 수행하여 $800^{\circ}C$에서 $1095mW/cm^2$의 출력이 얻어짐을 확인하였다. 또한, 반응 온도에 따른 전기화학적 임피던스 특성평가를 통하여 온도가 높아질수록 전해질 이온전도도가 증가되어 ohmic 저항이 감소되고 그에 따라 마이크로 관형 SOFC 셀 성능이 증가함을 확인할 수 있었다.

Keywords

Acknowledgement

Grant : 250W 군용 SOFC 전원개발

Supported by : 민군겸용기술센터

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