1. Institute of Chemistry University of Campinas, CEP 13083-970 Campinas SP Brazil
2. Institute of Chemistry of São Carlos University of São Paulo, CEP 13560-970 São Carlos SP Brazil
3. Laboratory of Physical and Analytical Electrochemistry École Polytechnique Fédérale de Lausanne (EPFL) Valais Wallis CH-1950 Sion Switzerland.
4. Renewable Energy Center Itaipu Technological Park Foundation Av. Tancredo Neves 6731 85.867-900 Foz do Iguaçu-PR Brazil