인산형 연료전지에 있어서 전극 성능에 미치는 인자의 영향

현정혁; 오기한; 노용우; 설용건; 이태희

HWAHAK KONGHAK, Vol.28, No.2, 205-211, April, 1990

Export Citation

인산형 연료전지에 있어서 전극 성능에 미치는 인자의 영향

Effects of Influencing Parameters on the Electrode Performance in Phosphoric Acid Fuel Cell

현정혁, 오기한, 노용우, 설용건, 이태희

초록

전극의 백금함량과 PTFE 함량 및 조작온도가 인산형 연료전지의 다공성 탄소전극 성능에 미치능 영향을 85wt% 인산전해질 중에서 반족전지 실험을 통하여 연구하였다. 전극의 백금 담지량이 5, 10, 15, 20wt%로 변함에 따라 Tafel 기울이기는 221, 176, 170, 145mV/decade로, 교환전류밀도는 1.866×10^-7, 1.307×10^-7, 9.206×10^-8, 4.874×10^-8A/cm²로 변하였다. 최적 PTFE 함량은 20-30wt%이었으며 전극반응의 겉보기 활성화에너지는 탄소적극 재료에 관계없이 평형전위에서 약 1100kJ/mol로 나타났다.

Effects of loading density of Pt and PTFE and operation temperature on the performance of carbon elec-trode were studied by a half cell in 85wt% phosphoric acid. As the Pt loading was varied to 5, 10, 15, and 20wt%, the Tafel slope was changed to 221, 176, 170, and 148mV/decade, respectively, and the exchange current density was changed to 1.866×10^-7, 1.307×10^-7, 9.206×10^-8, and 4.874×10^-8A/cm², respectively. The optimum content of PTFE was found to be 20-30wt%, and the apparent activation energy of the cathode reaction was found to be approx-imately 110kJ/mol at the equilibrium potential, regardless of the electrode carbon materials.

[References]

Appleby AJ, J. Electrochem. Soc., 117, 328 (1970)
Vogel WM, Lundquist JT, J. Electrochem. Soc., 117, 1512 (1970)
Bregoli LJ, Electrochim. Acta, 23, 489 (1978)
Kunz HR, Gruver GA, J. Electrochem. Soc., 122, 12 (1975)
Kunz HR, Gruver GA, Electrochim. Acta, 23, 219 (1978)
Giner J, Hunter C, J. Electrochem. Soc., 116, 1124 (1969)
Motoo S, Wanatabe M, Furuya N, J. Electroanal. Chem., 182, 193 (1985)
Watanabe M, Tozawa M, Motoo S, J. Electroanal. Chem., 183, 391 (1985)
Watanabe M, Tomikawa M, Motoo S, J. Electroanal. Chem., 195, 81 (1985)
Watanabe M, Makita K, Usami H, Motoo S, J. Electroanal. Chem., 197, 195 (1986)

[Referenced By]

[1] Appleby AJ, J. Electrochem. Soc., 117, 328 (1970)

[2] Vogel WM, Lundquist JT, J. Electrochem. Soc., 117, 1512 (1970)

[3] Bregoli LJ, Electrochim. Acta, 23, 489 (1978)

[4] Kunz HR, Gruver GA, J. Electrochem. Soc., 122, 12 (1975)

[5] Kunz HR, Gruver GA, Electrochim. Acta, 23, 219 (1978)

[6] Giner J, Hunter C, J. Electrochem. Soc., 116, 1124 (1969)

[7] Motoo S, Wanatabe M, Furuya N, J. Electroanal. Chem., 182, 193 (1985)

[8] Watanabe M, Tozawa M, Motoo S, J. Electroanal. Chem., 183, 391 (1985)

[9] Watanabe M, Tomikawa M, Motoo S, J. Electroanal. Chem., 195, 81 (1985)

[10] Watanabe M, Makita K, Usami H, Motoo S, J. Electroanal. Chem., 197, 195 (1986)