2.2. Apparatus
Cyclic voltammetry (CV) and square wave anodic stripping
voltammetry (SWASV) were performed with a CHI660B electrochemical
station (Chenhua Instruments Co., Shanghai, China). A
conventional three-electrode system consisted of a Bi–SbFE as the
working electrode with a diameter of 3.0 mm, a counter electrode
made of platinum wire and an Ag/AgCl reference electrode. All electrochemical
measurements were carried out in a 10.0 mL cell. All
potentials were given with respect to the Ag/AgCl electrode. The
pH S-3C meter (Shanghai Hongyi Instrumentation Co., Ltd., China)
was used to measure the pH in this experiment.