Figure 5

CV curves of electro-reduction Au(III) on the (a) bare GCE, and (b) MWCNTs/GCE in the potential range from + 0.7 to − 0.1 V at a scan rate of 50 mV s−1 in the solution containing KCl (0.1 mol L−1), HCl (2 mol L−1) and HAuCl4 (1 mmol L−1).

CV curves of electro-reduction Au(III) on the (a) bare GCE, and (b) MWCNTs/GCE in the potential range from + 0.7 to − 0.1 V at a scan rate of 50 mV s−1 in the solution containing KCl (0.1 mol L−1), HCl (2 mol L−1) and HAuCl4 (1 mmol L−1).