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(a) CV responses of Ag-ZnO/GCE at different scan rate variations (10 mVs−1 to 200 mVs−1), (b) linear regression plot of current vs. scan rate in presence of 500 µM 4-NP containing 0.1 M PBS (pH = 7) solution. (Accumulation time: 2 min, catalyst loading volume: 10 µL).
