Reference

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2. P. Bindra, S.J. Clouscr, and E. yeagcr, J. Elcctrochem. Soc., 126, 1631 (1979)

3. J. Aragane, T. Murahashi, and T. Odaka, J. Electro. Soc. 135,844 (1988)

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5. Rak-Hyun Song, Chang-Soo Kim, Byung-Woo Choi, Dong-Ryul Shin, Soo-Hyun Choi, HwahakKonghak, 31, 6,735-743 (1993).

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Time (hr)

Fig.l. Acid absorption in clectrocatalyst layer with variation of 25wt% (O), 35wt% (□)> 45wt% (A), 55wt% (O), and 65wt% (-¿r) of PTFE contents.

PTFE content (wtjs)

Fig.2. Current density (mA/crf) of cathode at _ 0.75VRHE as a function of PTFE contents in' the electrocatalyt layer. Reaction gas is oxygen. Acceleration test time are 0 hour (O), 5 hour (□), and 24 hour (A).

PTFE content (wtjs)

Fig.2. Current density (mA/crf) of cathode at _ 0.75VRHE as a function of PTFE contents in' the electrocatalyt layer. Reaction gas is oxygen. Acceleration test time are 0 hour (O), 5 hour (□), and 24 hour (A).

Fig.3. Current density (mA/crf) of cathode at 0.75 VRHE as a function of sintering temperature. Reaction gas is oxygen. Acceleration test time are 0 hour (O), 5 hours (□)» 24 hours (A).

Real Impedance / Q

Fig.5. Nyquist plots for oxygen reduction on the pre-wetted Pt/C electrode subjected to various applied potentials of: 250 hiVrhe, 0;300 mVRHE,O;350 HIVHHE, ; 450 mVjmE, •; 500 mVRHE, ■; 550 mVRHE, Ain 1M H2S04 solution.

Real Impedance / Q

Fig.5. Nyquist plots for oxygen reduction on the pre-wetted Pt/C electrode subjected to various applied potentials of: 250 hiVrhe, 0;300 mVRHE,O;350 HIVHHE, ; 450 mVjmE, •; 500 mVRHE, ■; 550 mVRHE, Ain 1M H2S04 solution.

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