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(a) Cyclic voltammetry of different WE materials in the acetate buffer (0.1 M, pH 4.65) with commercial Ag/AgCl (double junction) RE and Pt AE. Scan rate = 100 mV/s. Inset illustrates threshold potentials (i = 10 μA) of different WE materials (n = 3). (b) Cyclic voltammetry of Cu-based sensor in the acetate buffer (0.1 M) at different pH. Scan rate was 100 mV/s. (c) The threshold potential (i = 4 μA) at different pH (n = 3).
