Green processes for environmental application. Electrochemical ozone
production*
L. M. Da Silva1, L. A. De Faria2, and J. F. C. Boodts1,2,**
1Depto. de Química, FFCLRP/USP, Av. Bandeirantes, 3900. 14040-901.
Ribeirão Preto - SP, Brazil; 2Instituto de Química, UFU,
Campus Santa Mônica, Av. João Naves de Ávila, 2160.
38400-902, Uberlândia - MG, Brazil
Abstract: Several aspects of electrochemical ozone production
(EOP) on b-PbO2 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,
j) 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 b-PbO2/electrolyte
system was evaluated using the apparent specific power criterion. A
detailed mechanism for EOP is proposed.
* An issue of reviews and research papers based on
presentations made at the IUPAC/ICSU Workshop on
Electrochemistry and Interfacial Chemistry in Environmental Clean-up
and Green Chemical Processes, Coimbra, Portugal, 6-7 April, 2001.
** Corresponding author.
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