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http://dx.doi.org/10.7316/KHNES.2013.24.3.223

Effects of Calcination Temperature on Characteristics of Electrospun TiO2 Catalyst Supports for PEMFCs  

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)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.24, no.3, 2013 , pp. 223-229 More about this Journal
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
PEMFC; $TiO_2$; Catalyst support; Electrical conductivity; Electrospinning; Calcination temperature;
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