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(A) Cyclic voltammograms of (a) bare Au electrode, (b) Au electrode/cerium oxide, (c) Au electrode + H2O2, and (d) Au electrode/cerium oxide + H2O2. (B) Cyclic voltammograms of Au electrode/cerium oxide + H2O2 at different pH values: (a) 5, (b) 7, and (c) 9. (C) Cyclic voltammograms of Au electrode/cerium oxide in the presence of varied H2O2 concentrations, recorded in N2-purged PBS (0.1 M) at a scan rate of 0.03 V·s–1.
