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Cyclic voltammograms respectively obtained from the MHA/MCH-modified electrodes with the concentration (mM) ratios of 0:1 (red solid line), 0.1:1 (green dotted line), 0.04:1 (blue dashed line) and 0.02:1 (black dot-dashed line) in 0.5 mM NaOH from −0.3 V to −1.2 V with the scan rate of 100 mV/s.
