1. Department of Fundamental Chemistry Institute of Chemistry University of São Paulo Av. Professor Lineu Prestes, 748 05513-970 São Paulo – SP Brazil
2. Analytical Chemistry - Center for Electrochemical Sciences (CES) Faculty of Chemistry and Biochemistry Ruhr University Bochum Universitaetsstr. 150 D-44780 Bochum Germany
3. Department of Chemistry University of Warwick Coventry CV4 7AL United Kingdom