Kim Et Al

2. The optimum condition of sintering temperature is 350 "C. When the sintering temperature is lower than 350*0,the performance of electrode is rapidly decreased and the phenomena is closely related with poor formation of PTFE film and microstructure concerned acid absorption.

3. From the analysis of ac-impcdance measurement, the impedance spectra change from a capacitive arc and an inductive arc to two capacitive arcs, as depiction of the dissolved oxygen within narrow pores markedly appears. It is indicative of changes in mechanism and kinetics of oxygen reduction on the electrode in IMH2SO4 solution at room temperature.

ACKNOWLEDGMENT This work is supported by the Ministry of Trade, Industry and Energy, Korea.

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