Figure 1.

Consecutive cyclic voltammograms (n = 30) recorded with a carbon fiber microelectrode in PBS containing 2 mmol L⁻¹ nitrite (scan rate = 100 mV s⁻¹) from the initial potential (E_i = 0.50 V) to varying lower limit switching potentials (E_l = + 0.50 V (A) and −1.50 V (B)), then to the upper limit switching potential (E_u = 1.00 V), and then back to E_i. (C) shows current loss values (i_n / i_o, where i_o corresponds to the first scan) measured at 0.90 V as a function of the number of cycles (n) for different lower limit switching potentials (E_l). (D) shows the 30th-cycle recorded in PBS containing 2 mmol L⁻¹ nitrite at various scan rates.