알칼리형 연료전지용 La1-xCaxCoO3 기체확산전극의 산소환원반응

심중표; 박용석; 이홍기; 박수길; 이주성

Journal of the Korean Industrial and Engineering Chemistry, Vol.7, No.5, 992-998, October, 1996

Export Citation

알칼리형 연료전지용 La1-xCaxCoO3 기체확산전극의 산소환원반응

Oxygen Reduction Reaction of La_1-xCa_xCoO₃of Gas Diffusion Electrode in Alkaline Fuel Cell

심중표, 박용석, 이홍기, 박수길, 이주성

초록

Citrate process로 제조한 La_1-xCa_xCoO₃에서 Ca이 20mo1e% doping된 perovskite oxide가 산소환원반응에 대해 가장 높은 전류밀도와 specific activity를 보여주었으며 cyclic voltammogram에서 carbon만으로 제조된 전극에서보다 carbon과 Perovskite oxide를 혼합한 전극에서 높은 산소흡착/탈착전류를 보였다. 입자크기분포와 소결효과에 의해 900℃, 5시간 공기중에서 소결한 La_0.8Ca_0.2CoO₃가 산소환원반응에 대한 전기화학적 촉매특성이 우수하였다.

The La_0.8 Ca_0.2 CoO₃ prepared by a citrate process was shown to have higher oxygen reduction current density and specific activity than LaCoO₃, La_0.6 Ca_0.4 CoO₃. In the cyclic voltammogram, an oxygen desorption peak of a La_0.8 Ca_0.2 CoO₃ + carbon electrode was larger than that of a only carbon electrode. La_0.8 Ca_0.2 CoO₃ sintered at 900℃ for 5 hours was shown high oxygen reduction current density because of the particle size distribution and sintering effect.

[References]

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[1] Shim JP, Lee HK, Park SK, Lee JS, Synth. Met., 71, 2261 (1995)

[2] Lee HK, Shim JP, kim HJ, Lee JS, Kong YK, Proceeding of 36th Power Sources Conference (1994)

[3] Lee HK, Shim JP, Shim MJ, Kim SW, Lee JS, Mater. Chem. Phys., 45, 243 (1996)

[4] Ward CA, Stauga D, Pataki L, Venter RD, J. Power Sources, 41, 335 (1993)

[5] Kenjo T, Nakajima N, Bull. Chem. Soc. Jpn., 56, 1 (1983)

[6] Lee HK, Lee JS, J. Korean Ind. Eng. Chem., 3(4), 701 (1992)

[7] Larsson R, Johanson LY, J. Power Sources, 32, 253 (1990)

[8] Shimizu Y, Uemura K, Matsuda H, Miura N, Yamazoe N, J. Electrochem. Soc., 137, 3430 (1990)

[9] Baythoun MSG, Sale FR, J. Mater. Sci., 17, 2757 (1982)

[10] Lee HK, Shim JP, Shim MJ, Kim SW, Lee JS, Mater. Chem. Phys., 45, 238 (1996)

[11] Gallagher PK, MacChesney JB, Buchanan DNE, J. Chem. Phys., 45, 2466 (1966)