(A) CV of our
CPE/BSA in p-nitrophenol solution
(0.8 mM, CBS), when different negative potentials were applied: (a)
−0.7, (b) −0.8, (c) −0.9, (d) −1.0, and
(e) −1.1 V. Scan rate, 100 mV·s–1. (B)
Expanded dotted area of (A). (C) Electrochemical reduction mechanism
of p-nitrophenol.