전착이산화납 결정구조가 전해에 의한 오존발생에 미치는 영향

김인환; 이충영; 남종우

Journal of the Korean Industrial and Engineering Chemistry, Vol.7, No.2, 280-288, April, 1996

Export Citation

전착이산화납 결정구조가 전해에 의한 오존발생에 미치는 영향

The Effects of Electrodeposited Lead Dioxide Structure on the Ozone Evolution

김인환, 이충영, 남종우

초록

여러 가지 전착 조건에서 티타늄 기판상에 이산화납을 전착시킨 전극을 사용하여 전해질 용액 중에서 오존을 발생시킬 경우 전착된 이산화납의 결정표면 양상이 오존발생 전류효율에 미치는 영향과 이산화납 전극의 표면구조 변화를 고찰하였다. 또한 백금 디스크전극 위에 이산화납을 전착시킨 회전전극을 이용하여 산소전이반응이 오존발생에 미치는 영향과 오존발생용 전극으로 개발하기 위해 이산화납의 내식성과 오존발생 최적 전류밀도도 검토하였다. 전착한 이산화납의 결정표면 입자가 크고 결정성이 좋은 전극일수록 오존발생 전류효율이 높았으며 이러한 오존발생용 이산화납 전극을 전착시키기 위한 최적전류밀도는 50mA/cm²이었으며 전착용액에 글리세린을 소량 첨가하면 오존발생에 유리한 결정구조를 갖는 이산화납이 전착되었다. 또한 10mA/cm² 이하의 너무 낮거나 100mA/cm² 이상의 너무 높은 전류밀도에서는 오존발생 성능이 떨어지고 소지금속에 대한 접착성이 좋지 않은 전극이 만들어 졌다 새로 만들어진 이산화납전극을 오존발생용으로 사용할 때 사용 초기 단계에서 이산화납전극의 표면구조 변화가 일어나며 이는 오존발생에 유리한 효과를 가져왔다. 타원소를 도핑시킨 이산화납 전극에서는 오존발생보다 산소발생 반응이 활발하게 일어나 오존발생은 산소발생의 중간 단계를 거치지 않고 산소발생과는 경쟁적으로 일어나는 것으로 추정되며 0.7∼0.8A/cm² 의 전류밀도에서 최대의 오존발생 전류효율을 나타내었다.

In the ozone evolution using PbO₂, which was electrodeposited on Ti plate at various conditions in electrolyte, the effects of lead dioxide structure on the current efficiency and surface structure changes of lead dioxide were investigated. Also the effects of oxygen transfer reaction on the ozone evolution were investigated by means of a PbO₂ electrodeposited on the platinum rotating disk electrode. In order to develope an electrode for ozone evolution, durability of lead dioxide and optimum current density were investigated. At the electrodeposited lead dioxide with the larger grain size and higher crystallinity, the efficiency for ozone evolution was higher. Optimum current density to electrodeposite lead dioxide with large grain size and high crystalinity was 50mA/cm². Lead dioxide deposited in the presence of glycerin showed the best advantage of ozone evolution. Also lead dioxide electrodeposited at less than 10mA/cm² or at more than 100mA/cm² has poor performance of ozone evolution and poor adhesive strength to substrate. In the beginning of ozone evolution, surface structure of lead dioxide was changed and this change resulted in good effects on ozone evolution. Lead dioxide doped with other elements was favorable not to ozone evolution but to oxygen evolution, so it is speculated that ozone evolution has not intermediate stage of oxygen evolution and occurs competitively with oxygen evolution. When ozone was evolved at 0.7∼0.8A/cm², the current efficiency was highest.

[References]

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

[2] Sreinberg M, Beller M, Powell JR, "Large Scale Ozone Production in Chemonuclear Reactions for Water Treatment," 1st Int. Symp. on Ozone for Water & Wastewater Treatment, 10 (1973)

[3] Foller PC, Tobias CW, J. Phys. Chem., 85, 3238 (1981)

[4] Ota KI, Okada Y, Kamiya N, Denki Kagaku, 54, 890 (1986)

[5] Wen TC, Chang CC, J. Electrochem. Soc., 140, 2764 (1993)

[6] American Public Health Association, American Water Works Association, American Pollution Control Federation: "Standard Methods for the Examination of Water and Wastewater," Port City Press, 17th Edition, 4-162, Washington, D.C. (1989)

[7] Delahay P, Pourbaix M, Pysselberghe PV, J. Electrochem. Soc., 98, 57 (1951)

[8] Mindt W, J. Electrochem. Soc., 116, 1076 (1969)

[9] Foller PC, Tobias CW, J. Electrochem. Soc., 129, 506 (1982)

[10] Yeo IH, Johnson DC, J. Electrochem. Soc., 134, 1973 (1987)

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

[12] Chang H, Johnson DC, J. Electrochem. Soc., 137, 3108 (1990)

[13] Hsido YL, Vitt JE, Johnson DC, J. Electrochem. Soc., 139, 377 (1992)