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수소 생산용 SPE 전극촉매의 제조 및 특성화
SPE Electrocatalyst for Hydrogen Production-Its Preparation and Characterization
HWAHAK KONGHAK, December 1996, 34(6), 706-715(10), NONE
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Abstract
환원제 침투법으로 Solid Polymer Electrolyte(이하 SPE)에 백금을 담지시켜서 SPE전극촉매(이하 전극촉매)를 제조하고 백금의 담지량 및 형태학적 특성, 전기화학적 특성, 그리고 물 전해조에서의 조전압 특성을 조사하였다. 그 결과, 환원제 농도를 증가시키면서, 백금 담지량이 증가하다 감소하였는데, 환원제 농도 1.0 mol/L일 때 담지량이 가장 많아서 3.56mg/㎠이었고 이때, 가장 두꺼운 촉매층이 형성되었다. 제조한 전극촉매의 전류-전압도에서 수소 흡착 피크로부터 계산한 전기량과 거칠기 인자는 환원제 농도 1.0 mol/L에서 284.92mC, 1356.75로 가장 컸지만, 활성 비표면적은 다소 작아졌다. 한편, 전극촉매의 전류 밀도에 따른 조전압 변화를 실험한 결과, 백금 담지량이 많을수록 조전압이 감소하는 현상을 보였는데, 담지량이 3.56mg/㎠, 전류 밀도 1A/㎠하에서 50℃,80℃일 때, 각각 2.9V, 2.7V를 나타내었다. 이때, 환원제 농도는 1.0mol.L.
SPE electrocatalysts were made by reducing agent penetrating method. Pt loading, morphological, and electrochemical characteristics and cell voltage properties were investigated.
The amount of Pt loading increased upto the reducing agent concentration of 1.0mol/L and then decreased. At that concentration, the amount of Pt loading was the most, 3.56mg/㎠ and Pt layer was the thickest. The largest electricity and roughness factor from cyclic voltammogram were 284.92mC and 1356.75 respectively at the reducing agent concentration 1.0 mol/L. But surface area per unit weight of Pt was somewhat lower. As the amount of Pt loading increased, cell voltage became lower. At the amount of Pt loading 3.56 mg/㎠, current density 1 A/㎠, and temperature 25℃ it was the lowest, 3.0V. As temperature increased, cell voltage became lower. Cell voltages at 50℃, 80℃ were 2.9V, 2.7V respectively under the condition of 3.56 mg/㎠, 1A/㎠. It was at the reducing agent concentration 1.0mol/L.
The amount of Pt loading increased upto the reducing agent concentration of 1.0mol/L and then decreased. At that concentration, the amount of Pt loading was the most, 3.56mg/㎠ and Pt layer was the thickest. The largest electricity and roughness factor from cyclic voltammogram were 284.92mC and 1356.75 respectively at the reducing agent concentration 1.0 mol/L. But surface area per unit weight of Pt was somewhat lower. As the amount of Pt loading increased, cell voltage became lower. At the amount of Pt loading 3.56 mg/㎠, current density 1 A/㎠, and temperature 25℃ it was the lowest, 3.0V. As temperature increased, cell voltage became lower. Cell voltages at 50℃, 80℃ were 2.9V, 2.7V respectively under the condition of 3.56 mg/㎠, 1A/㎠. It was at the reducing agent concentration 1.0mol/L.
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Millet P, Durand R, Pineri M, Int. J. Hydrog. Energy, 15, 245 (1990)
Appleby AJ, Foulkes FR, "Fuel Cell Handbook," Van Nostrand Reinhold (1989)
채재근, 오정훈, 강문식, 한학수, 설용건, 조영일, 화학공학의 이론과 응용, 1(21), 725 (1995)
Millet P, Alleau T, Durand R, J. Appl. Electrochem., 23, 322 (1993)
Takenaka H, Torikai E, Kawami Y, Wakabayashi N, Int. J. Hydrog. Energy, 7, 397 (1982)
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Kita H, Fujikawa K, Nakajima H, Electrochim. Acta, 12, 1721 (1984)
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David WD, Allen JB, J. Electrochem. Soc., 135, 1977 (1988)
Scott K, "Electrochemical Reaction Engineering," Academic Press, Ltd., London (1991)
