Amorphous Citrate Precursor 법으로 제조한 La0.6Ca0.4CoO3와 Pb2Ru2O6의 전기화학적 촉매능

이철경; 손헌준

Journal of the Korean Industrial and Engineering Chemistry, Vol.10, No.3, 331-335, May, 1999

Export Citation

Amorphous Citrate Precursor 법으로 제조한 La_0.6Ca_0.4CoO₃와 Pb₂Ru₂O₆의 전기화학적 촉매능

Electrocatalytic Performances of La_0.6Ca_0.4CoO₃ and Pb₂Ru₂O₆ prepared by Amorphous Citrate Precursor Method

이철경, 손헌준

초록

전이금속 산화물은 전기화학적 산소 발생/환원에 대한 bifunctional 촉매효과가 있어 금속-공기 이차전지와 같은 에너지 저장기술 개발에 연구대상이 되어왔다. Amorphous citrate precursor법을 이용하여 perovskite 구조를 갖는 La-Ca-Co 산화물과 pyrochlore 구조를 갖는 Pb-Ru 산화물을 제조하고, 이후 열처리법으로 표면적이 큰 전이금속 산화물 촉매분말을 제조하였다. PTFE 결합 기체확산형 전극의 충방전 실험을 통하여 전기화학적 산소 발생/환원에 대한 좋은 촉매능을 가짐을 확인하였고, ±25 mA/cm²의 전류밀도를 가하고 공기를 공급하면서 충방전 실험한 결과 100시간 이내에서 두촉매분말 모두 안정하였다. ACP법으로 제조한 perovskite 구조의 La_0.6Ca_0.4CoO₃과 pyrochlore 구조의 Pb₂Ru_{2_{O₆가 이차전지용 공기전극 재료로 사용할 수 있음을 확인하였다.}}

The transition metal oxides have been of interest as bifunctional electrocatalysts for bifunctional air electrodes. The amorphous citrate precursor (ACP) process has been optimized to prepare perovskite (La_0.6Ca_0.4CoO₃) and pyrochlore (Pb₂Ru₂O₆) powders with high surface area, and consequent improvement of the electrocatalytic performance in an air electrode with thermal treatment. PTFE-bonded gas diffusion electrodes loaded with perovskite and pyrochlore catalysts showed good bifunctional performances. The electrodes were fairly stable up to 100 hour in the galvanostatic mode at ±25 mA/cm², from which these electrodes offer promise as practical bifunctional air electrodes.

Keywords:Transition Metal Oxide;Air Electrode;Bifunctionality;Citrate Precursor

[References]

Poirier JA, Stoner GE, J. Electrochem. Soc., 141(2), 425 (1994)
Yang YF, Zhou YH, J. Electroanal. Chem., 397(1-2), 271 (1995)
Yang YF, Zhou YH, Cha CS, Electrochim. Acta, 40(16), 2579 (1995)
Kannan AM, Shukla AK, Sathyanarayara S, J. Power Sources, 25, 141 (1989)
Larsson R, Johansson L, J. Power Sources, 32, 253 (1990)
Kudo T, Obayashi H, Yoshida M, J. Electrochem. Soc., 124, 323 (1977)
Jiang SP, Tseung ACC, J. Electrochem. Soc., 137, 3442 (1990)
Krstajic N, Trasatti S, J. Electrochem. Soc., 142(8), 2675 (1995)
Tsionsky M, Lev O, J. Electrochem. Soc., 142(7), 2132 (1995)
Jain AN, J. Chem. Soc.-Faraday Trans., 91, 1871 (1995)
Fischer C, Alonsovante N, Fiechter S, Tributsch H, J. Appl. Electrochem., 25(11), 1004 (1995)
Miura N, Horiuchi H, Shimizu Y, Yamazoe N, Nippon Kagaku Kaishi, 617 (1987)
Shimizu Y, Uemura K, Miura N, Yamazoe N, Chem. Lett., 1979 (1988)
Shimizu Y, Uemura K, Yamazoe N, J. Electrochem. Soc., 137, 3430 (1990)
Muller S, Striebel K, Haas O, Electrochim. Acta, 39(11-12), 1661 (1994)
Horowitz HS, Longo JM, Haberman JI, U.S. Patent, 4,129,525 (1978)

[1] Poirier JA, Stoner GE, J. Electrochem. Soc., 141(2), 425 (1994)

[2] Yang YF, Zhou YH, J. Electroanal. Chem., 397(1-2), 271 (1995)

[3] Yang YF, Zhou YH, Cha CS, Electrochim. Acta, 40(16), 2579 (1995)

[4] Kannan AM, Shukla AK, Sathyanarayara S, J. Power Sources, 25, 141 (1989)

[5] Larsson R, Johansson L, J. Power Sources, 32, 253 (1990)

[6] Kudo T, Obayashi H, Yoshida M, J. Electrochem. Soc., 124, 323 (1977)

[7] Jiang SP, Tseung ACC, J. Electrochem. Soc., 137, 3442 (1990)

[8] Krstajic N, Trasatti S, J. Electrochem. Soc., 142(8), 2675 (1995)

[9] Tsionsky M, Lev O, J. Electrochem. Soc., 142(7), 2132 (1995)

[10] Jain AN, J. Chem. Soc.-Faraday Trans., 91, 1871 (1995)

[11] Fischer C, Alonsovante N, Fiechter S, Tributsch H, J. Appl. Electrochem., 25(11), 1004 (1995)

[12] Miura N, Horiuchi H, Shimizu Y, Yamazoe N, Nippon Kagaku Kaishi, 617 (1987)

[13] Shimizu Y, Uemura K, Miura N, Yamazoe N, Chem. Lett., 1979 (1988)

[14] Shimizu Y, Uemura K, Yamazoe N, J. Electrochem. Soc., 137, 3430 (1990)

[15] Muller S, Striebel K, Haas O, Electrochim. Acta, 39(11-12), 1661 (1994)

[16] Horowitz HS, Longo JM, Haberman JI, U.S. Patent, 4,129,525 (1978)