높은 산소과전압과 내구성의 이사놔납전극 제조에 관한 연구

김재관; 최병선; 남종우

Journal of the Korean Industrial and Engineering Chemistry, Vol.7, No.6, 1105-1114, December, 1996

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높은 산소과전압과 내구성의 이사놔납전극 제조에 관한 연구

A Study on the Preparation of Lead Dioxide Electrode with High Oxygen Overvoltage and Durability

김재관, 최병선, 남종우

초록

α-PbO₂/IrO₂-TiO₂/Ti지지체상에 sodium lauryl sulfate 및 TiO₂분말을 첨가한 질산납 전해액에서 전착한 β-PbO₂층의 특성 및 성능을 XRD, SEM, cyclic voltammograms, 매크로전해를 이용하여 검토하였다. XRD분석결과 sodium lauryl sulfate 및 TiO₂ 분말의 존재하에 α-PbO₂/IrO₂-TiO₂/Ti 지지체 위에 전착한 β-PbO₂층은 순수한 β-PbO₂층과 마찬가지로 정방정계구조를 나타냈다. SEM결과 sodium lauryl sulfate는 전착층의 결정입자크기를 작게 하는 경향을 보여준다. sodium lauryl sulfate 및 TiO₂분말의 존재하에 전착한 β-PbO₂전극은 KOH 및 HClO₄지지전해질에서 양극산화에 대한 산소과전압과 내구성을 크게 향상시켰다. 티타늄마드래스에 전착시킨 β-PbO₂전극을 이용하여 과염소산용액으로부터 오존 발생에 대한 전극성능과 내구성을 검토하였다. HClO₄지지전해질에 sodium lauryl sulfate와 TiO₂분말을 첨가하여 α-PbO₂/IrO₂-TiO₂/Ti 마드래스상에 전착한 β-PbO₂ 전극이 가장 높은 전류효율과 내구성을 가짐을 확인하였다.

The characteristic and performance of β-PbO₂ layer electrodeposited on α-PbO₂/IrO₂-TiO₂/Ti substrate by adding sodium lauryl sulfate and TiO₂ powder in lead nitrate solution were investigated by using XRD, SEM, cyclic voltammograms, and macro-elctrolysis. Results of XRD analysis ascertain that β-PbO₂ layers electrodeposited in the presence of sodium lauryl sulfate and TiO₂, powder on α-PbO₂/IrO₂-TiO₂/Ti substrate have the same tetragonal structure as pure β-PbO₂ layers. The SEM results show that sodium lauryl sulfate tend to diminish crystal size of the deposited layer. The β-PbO₂ electrode electrodeposited in the presence of sodium lauryl sulfate and TiO₂ powder gives significantly improved oxygen overvoltage and durability for anodic oxidation in KOH and HC1O₄ supporting electrolyte. Electrode performance and durability for the evolution of ozone in perchloric acid solution have been investigated by using β-PbO₂ electrodes electrodeposited on Titanium madrasg^R. It was ascertained that the PbO₂ electrode electrodeposited on α-PbO₂/IrO₂-TiO₂/Ti madrasmadrasg^R by adding sodium lauryl sulfate and TiO₂ powder in HC1O₄ supporting electrolyte had the highest current efficiency and durability.

[References]

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[1] Pavid BL, Brink DR, "Ozone in Water Treatment; Application and Engineering," Lewis Publishers, London (1991)

[2] Tabata N, "High Power Density Ozonier," 3rd Int. Symp. on Ozone Technology, Paris (1977)

[3] Trasatti S, "Electrodes of Conductive Metallic Oxides," Chap. 4, 11, 217, 628, Elsevier Sci., Pub., Amsterdam, Oxford. NY (1981)

[4] Steckhan E, "Topics in Current Chemistry," Chap. 1, 13, Springer-Veriag, New York, Tronto (1987)

[5] Chang H, Johnson DC, J. Electrochem. Soc., 136, 17 (1989)

[6] Carr JP, Hampson WA, Chem. Rev., 72, 682 (1972)

[7] Weinberg NL, Weinberg HR, Chem. Rev., 68, 449 (1968)

[8] Bard AJ, Faulkner LR, "Electrochemical Method," Chap. 8, 291, John Wiley & Sons, New York, Tronto (1980)

[9] Gabe DR, "Principle of Metal Surface Treatment and Protection," 2nd ed., 66, Pergamon Press, Ins., Elmsford., NY (1978)

[10] Foller PC, Grodwin ML, Ozone Sci. Eng., 6, 29 (1984)