Linear sweap voltammetry was performed with the autolab PGSTAT12 potentail / galvanostat that be an analyzer. The analyzer was connected with private computer and electrochemical cell (glassware). The working electrodes are glassy carbon (GC) disk electrode. the electrode has 3 mm diameter. The Ag/AgCl was used to reference electrode. In addition, 0.5 M of H2SO4 was referred to electrolyte. Moreover, polishing electrode was polished by 0.3 alumina with polishing pad.