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

높은 산소과전압과 내구성의 이산화납전극 제조에 관한 연구

  • Kim, Jae Kwan (Environmental Technology Research Group, Korea Electric Power Research Institute) ;
  • Choi, Byun Sun (Environmental Technology Research Group, Korea Electric Power Research Institute) ;
  • Nam, Chong Woo (Department of Chemical Engineering, Inha University)
  • 김재관 (전력연구원 환경설비그룹) ;
  • 최병선 (전력연구원 환경설비그룹) ;
  • 남종우 (인하대학교 화학공학과)
  • Received : 1996.07.22
  • Accepted : 1996.11.11
  • Published : 1996.12.10

Abstract

The characteristic and performance of ${\beta}-PbO_2$ layer electrodeposited on ${\alpha}-PbO_2/IrO_2-TiO_2/Ti$ substrate by adding sodium lauryl sulfate and $TiO_2$ powder in lead nitrate solution were investigated by using XRD, SEM, cyclic voltammograms, and macro-elctrolysis. Results of XRD analysis ascertain that ${\beta}-PbO_2$ layers electrodeposited in the presence of sodium lauryl sulfate and $TiO_2$, powder on ${\alpha}-PbO_2/IrO_2-TiO_2/Ti$ substrate have the same tetragonal structure as pure ${\beta}-PbO_2$ layers. The SEM results show that sodium lauryl sulfate tend to diminish crystal size of the deposited layer. The ${\beta}-PbO_2$ electrode electrodeposited in the presence of sodium lauryl sulfate and $TiO_2$ powder gives significantly improved oxygen overvoltage and durability for anodic oxidation in KOH and $HClO_4$ supporting electrolyte. Electrode performance and durability for the evolution of ozone in perchloric acid solution have been investigated by using ${\beta}-PbO_2$ electrodes electrodeposited on Titanium $madras^{(R)}$. It was ascertained that the $PbO_2$ electrode electrodeposited on ${\alpha}-PbO_2/IrO_2-TiO_2/Ti$ $madras^{(R)}$ by adding sodium lauryl sulfate and $TiO_2$ powder in $HClO_4$ supporting electrolyte had the highest current efficiency and durability.

${\alpha}-PbO_2/IrO_2-TiO_2/Ti$지지체상에 sodium lauryl sulfate 및 $TiO_2$분말을 첨가한 질산납 전해액에서 전착한 ${\beta}-PbO_2$층의 특성 및 성능을 XRD, SEM, cyclic voltammograms, 매크로전해를 이용하여 검토하였다. XRD분석결과 sodium lauryl sulfate 및 $TiO_2$분말의 존재하에 ${\alpha}-PbO_2/IrO_2-TiO_2/Ti$ 지지체 위에 전착한 ${\beta}-PbO_2$층은 순수한 ${\beta}-PbO_2$층과 마찬가지로 정방정계구조를 나타냈다. SEM결과 sodium lauryl sulfate는 전착층의 결정입자크기를 작게 하는 경향을 보여준다. sodium lauryl sulfate 및 $TiO_2$분말의 존재하에 전착한 ${\beta}-PbO_2$전극은 KOH 및 $HClO_4$지지전해질에서 양극산화에 대한 산소과전압과 내구성을 크게 향상시켰다. 티타늄마드래스에 전착시킨 ${\beta}-PbO_2$전극을 이용하여 과염소산용액으로부터 오존 발생에 대한 전극성능과 내구성을 검토하였다. $HClO_4$지지전해질에 sodium lauryl sulfate와 $TiO_2$분말을 첨가하여 ${\alpha}-PbO_2/IrO_2-TiO_2/Ti$ 마드래스상에 전착한 ${\beta}-PbO_2$전극이 가장 높은 전류효율과 내구성을 가짐을 확인하였다.

Keywords

References

  1. Ozone in Water Treatment; Application and Engineering B. L. Pavid;D. R. Brink
  2. 3rd Int. Symp. on Ozone Technology High Power density Ozonier N. Tabata
  3. Electrodes of Conductive Metallic Oxides S. Trasatti
  4. Topics in Current Chemistry E. Steckhan
  5. J. Electrochem. Soc. v.136 H. Chang;D. C. Johnson
  6. Chem. Rev. v.72 J. P. Carr;W. A. Hampson
  7. Chem. Rev. v.68 N. L. Weinberg;H. R. Weinberg
  8. Electrochemical Method A. J. Bard;L. R. Faulkner
  9. Principle of Metal Surface Treatment and Protection(2nd ed.) D. R. Gabe
  10. Ozone:Sci. Eng. v.6 P. C. Foller;M. L. Grodwin