Journal of Hydrogen and New Energy (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Effects of Calcination Temperature on Characteristics of Electrospun TiO2 Catalyst Supports for PEMFCs

열처리 온도가 전기방사방법을 이용하여 제조한 PEMFC용 TiO2 담체의 물리적 특성에 미치는 영향

  • Kwon, Chorong (Department of Energy Environment Policy and Technology, GREEN SCHOOL, Korea University) ;
  • Yoo, Sungjong (Fuel Cell Research Center, Korea Institute of Science and Technology) ;
  • Jang, Jonghyun (Fuel Cell Research Center, Korea Institute of Science and Technology) ;
  • Kim, Hyoungjuhn (Fuel Cell Research Center, Korea Institute of Science and Technology) ;
  • Kim, Jihyun (Department of Energy Environment Policy and Technology, GREEN SCHOOL, Korea University) ;
  • Cho, Eunae (Department of Energy Environment Policy and Technology, GREEN SCHOOL, Korea University)
  • 권초롱 (고려대학교 그린스쿨 대학원) ;
  • 유성종 (한국과학기술연구원 연료전지연구센터) ;
  • 장종현 (한국과학기술연구원 연료전지연구센터) ;
  • 김형준 (한국과학기술연구원 연료전지연구센터) ;
  • 김지현 (고려대학교 그린스쿨 대학원) ;
  • 조은애 (고려대학교 그린스쿨 대학원)
  • Received : 2013.04.23
  • Accepted : 2013.06.30
  • Published : 2013.06.30
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Abstract

Polymer Electrolyte Membrane Fuel Cell (PEMFC) is a power generation system to convert chemical energy of fuels and oxidants to electricity directly by electrochemical reactions. As a catalyst support for PEMFCs, carbon black has been generally used due to its large surface area and high electrical conductivity. However, under certain circumstances (start up/shut down, fuel starvation, ice formation etc.), carbon supports are subjected to serve corrosion in the presence of water. Therefore, it would be desirable to switch carbon supports to corrosion-resistive support materials such as metal oxide. $TiO_2$ has been attractive as a support with its stability in fuel cell operation atmosphere, low cost, commercial availability, and the ease to control size and structure. However, low electrical conductivity of $TiO_2$ still inhibits its application to catalyst support for PEMFCs. In this paper, to explore feasibility of $TiO_2$ as a catalyst support for PEMFCs, $TiO_2$ nanofibers were synthesized by electrospinning and calcinated at 600, 700, 800 and $900^{\circ}C$. Effects of calcination temperature on crystal structure and electrical conductivity of electrospun $TiO_2$ nanofibers were examined. Electrical conductivity of $TiO_2$ nanofibers increased significantly with increasing calcination temperature from $600^{\circ}C$ to $700^{\circ}C$ and then increased gradually with increasing the calcination temperature from $700^{\circ}C$ to $900^{\circ}C$. It was revealed that the remarkable increase in electrical conductivity could be attributed to phase transition of $TiO_2$ nanofibers from anatase to rutile at the temperature range from $600^{\circ}C$ to $700^{\circ}C$.

Keywords

References

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