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a Activated CuNi/C electrodes in 0.1 M NaOH by CV for 60 cycles. b CVs of activated electrodes in 0.1 M NaOH and 0.1 M NaOH + 0.4 mM glucose. The CV measurements are performed in a three-electrode system by using Pt foil as counter electrode, and Ag/AgCl as a reference electrode. The scan rate is 20 mV s−1
