1. Institute of Chemistry State University of Campinas PO Box 6154 13083-970 Campinas SP Brazil
2. Center for Innovation on New Energies State University of Campinas 13083-841 Campinas, SP Brazil
3. Brazilian Synchrotron Light Laboratory (LNLS) Brazilian Center for Research in Energy and Materials (CNPEM) 13083-970 Campinas, SP Brazil
4. Chemistry Department Federal University of São Carlos 13565-905 São Carlos, SP Brazil