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졸-겔 공정을 이용한 미세다공성 RuO2-TiO2 전극의 제조
Preparation of Microporous RuO2-TiO2 Electrodes by the Sol-Gel Process
HWAHAK KONGHAK, October 1999, 37(5), 725-728(4), NONE
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Abstract
졸-겔 공정으로 다양한 조성의 미세다공성 RuO2-TiO2 전극을 제조하고 그 물리적 및 전기화학적 특성을 분석하였다. Titanium isopropoxide와 ruthenium chloride hydrate를 전구체로 사용하고 isopropyl alcohol을 용매로 사용하여 상온에서 안정하고 균일한 졸을 얻었다. 산화물 중에서 RuO2의 mole 비율이 증가할수록 활성물질의 절대량은 증가하였으나, 입자가 성장하여 표면이 거칠어지고 비표면적은 감소하였다. Tafel plot과 anodic polarization curve로부터 40 mol%의 RuO2를 함유하는 전극이 산소 발생 반응에 대한 높은 교환전류밀도와 낮은 과전압으로 전기화학적 활성이 높고 에너지 효율이 우수함을 확인하였다.
Microporous RuO2-TiO2 binary metal oxide electrodes with various compositions were prepared by the sol-gel process. Ruthenium chloride hydrate and titanium isopropoxide were used as precursors, and isopropyl alcohol was used as a solvent. Sol solutions were stable and uniform at room temperature. With increasing mole ratio of RuO2 in the metal oxide electrode, RuO2 particle grow on the electrode surface and specific surface area was decreased. From Tafel plots and anodic polarization curves, the binary metal oxide electrode with 40% RuO2 showed the highest exchange current density and the lowest overpotential for oxygen evolution.
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References
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Coulter MO, "Modern Chlor-Alkali Technology," Ellis Horwood, London (1980)
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Trasatti S, "Electrodes of Conductive Metallic Oxides," Elsevier Scientific Publishing Company, New York (1980)
Trasatti S, Electrochim. Acta, 36, 225 (1991)
Guglielmi M, Colombo P, Rigato V, Battaglia G, Boscolo-Boscoletto A, DeBattisti A, J. Electrochem. Soc., 139, 1655 (1992)
Kameyama K, Shohji S, Onoue S, Nishimura K, Yahikozawa K, Takasu Y, J. Electrochem. Soc., 140, 1034 (1993)
Kameyama K, Tsukada K, Yahikozawa K, Takasu Y, J. Electrochem. Soc., 141(3), 643 (1994)
Bard AJ, Faulkner LR, "Electrochemical Methods-Fundamentals and Applications," John Wiley & Sons, Canada (1980)
