Square-wave voltammetry(SWV)experiments were performed using a model PGSTAT 101 Autolab Electrochemical System controlled with the NOVA soft ware package(Kanaalweg29-G 3526 KM
Utrecht,TheNetherlands).All experiments were performed using a conventional three electrode system with a glassy carbon(GC)electrode with a diameter of 3.0 mm as the
working electrode,a platinum wire as the auxiliary electrode,and a standard Ag/AgCl(3MKCl)reference electrode.