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CVs recorded at scan rate 0.05 Vs−1 in 0.1 M PBS (pH 7.0) (a) CVs from bare GCE, CuO/GCE, Yb2O3/GCE, rGO/GCE, Yb2O3.CuO/GCE, Yb2O3.CuO@rGO/GCE with 40 µM AA, (b) CVs from the Yb2O3.CuO@rGO/GCE with 40 µM AA and without AA, and (c) EIS Nyquist plots acquired using various electrodes in 1.0 mM [Fe(CN)6]3−/4− in 0.1 M KCl at +0.50 V, at signal amplitude 10 mV, and with frequency ranging from 0.1 Hz to 100 KHz with a relevant equivalent circuit in the inset.
