Figure 6.
Second-order derivative linear sweep voltammograms recorded on (a) graphite powder (CPE), (b) ABPE, (c) GR/CPE and (d) GR/ABPE. (Concentration: 10 μM 4-NP and 0.1 M HCl, accumulation conditions: 0.0 V, 60 s, scan rate: 0.1 V s−1).
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