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The Research of TiO2 Doped PbO2 Electrode in Electrochemical Ozone Production

Author: WangBaoJun
Tutor: YouHong
School: Harbin Institute of Technology
Course: Environmental Science and Engineering
Keywords: electrochemical ozone production TiO2 doped PbO2 electrode nano-composite plating electrocatalytic activity electrolysis factors
CLC: TQ123.2
Type: Master's thesis
Year: 2007
Downloads: 84
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Abstract


As the high specific energy consumption is the primary disadvantage of electrochemical ozone production and the key influencing factor is the electrocatalytic activity of the anode, the research on new electrodes and preparation condition of the electrodes are primary task to solve the problem. In this paper, a comprehensive description of recent research on the study and application of electrodes using in electrochemical ozone production （EOP） was summarized. On the basis of the summarization, TiO2 doped PbO2 electrode was used as the anode in EOP in order to enhance the electrocatalytic activity and stability of the electrode.PbO2-matrix composites containing nano-grade TiO2 as dispersed phase have been obtained on Ti substrate using nano-composite plating technique and were applied to EOP. The results showed that under magnetic stirring and with addition 0.02g/L sodium dodecyl-benzene sulfonate, the doping of TiO2 could increase the electrocatalytic activity of PbO2 electrodes in EOP by increasing the current efficiency from 10.86% to 12.22%, and under ultrasonic dispersion, the doping of TiO2 could increase the electrocatalytic activity of PbO2 electrodes in EOP by increasing the current efficiency from 12.76% to 13.46%,when the electrodes were prepared at the current density of 30mA/cm2 and electrodes gap distance of 3cm. But the doping of TiO2 had no improvement on the corrosion resistance of the electrode.The influence of current density（J）, the particle radius of TiO2 and its concentration in electrodeposition solution, the addition of surfactants and PTFE on the properties of doped electrodes were studied. The electrodes were characterized by XRD and XRF techniques and the results indicated, both the doped electrodes and pure PbO2 electrodes mainly haveβ-PbO2 crystals, and the incorporation of TiO2 particles did not affect the oriented growth of PbO2 but the radius of PbO2 crystals. The content of TiO2 was higher when the electrdoposition current density was lower. Relating the current efficiency （CE） of EOP results of the electrodes indicated high content TiO2 in PbO2 was not good to the electrocatalytic activity of the electrode. The particle radius of TiO2 had a great influence on the properties of the electrodes. In the research, the PT-501A TiO2（100nm） doped electrodes under ultrasonic dispersion increased the CE of EOP by about 2.3% with addition 0.03g/L sodium dodecyl-benzene sulfonate. The highest CE was observed at an optimum concentration of TiO2 of 7.512.5g/L.Fe3+ could decrease the electrocatalytic activity of the electrodes.The addition of Anionic Surfactants favourable for the current efficiency of EOP. Under ultrasonic dispersion and with addition 0.03g/L sodium dodecyl-benzene sulfonate, the doping of TiO2 could increase the electrocatalytic activity of PbO2 electrodes in EOP by increasing the current efficiency15.02% when the electrodes were prepared at the current density of 30mA/cm2 .The influence of the flux of electrolyte,current density,electrolytic concentration on the EOP were studied. The experimental results showed that the current efficiency of EOP was highest when the flux of electrolyte was 127.68mL/min and the current efficiency of EOP increased with increasing current density and electrolytic concentration.

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CLC: > Industrial Technology > Chemical Industry > Non-metallic elements and their inorganic compounds, the chemical industry > Oxygen > Production of ozone
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