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Several aspects of electrochemical ozone production (EOP) on β-PbO 2 were investigated. The morphology of the electrode material was determined in situ using extensive (total, external, and internal differential capacity) and intensive parameters (the morphology factor, ϕ) permitting comparison with results of other laboratories if appropriate electrode characterization parameters are available. The influence of the nature of the supporting electrolyte on the oxygen evolution reaction (OER)/EOP processes was investigated using polarization curves, recorded under quasi-stationary conditions, point-by-point polarization, and chronopotentiometry. The performance of the several β-PbO 2 /electrolyte system was evaluated using the apparent specific power criterion. A detailed mechanism for EOP is proposed.

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Recebido em 25/11/02; aceito em 1/4/03After an introductory discussion emphasising the importance of electrochemistry for the so-called Green Chemical Processes, the article presents a short discussion of the classical ozone generation technologies. Next a revision of the electrochemical ozone production technology focusing on such aspects as: fundamentals, latest advances, advantages and limitations of this technology is presented. Recent results about fundamentals of electrochemical ozone production obtained in our laboratory, using different electrode materials (e.g. boron doped diamond electrodes, lead dioxide and DSA  -based electrodes) also are presented. Different chemical processes of interest to the solution of environmental problems involving ozone are discussed.