Fig. 4

Influence of the scan rate on CVs. (a) CVs recorded at NiCo₂O₄/GC electrode in 0.1 M NaOH supporting electrolyte at various scan rates: 10 mV s⁻¹ (curve 1), 20 mV s⁻¹ (curve 2), 30 mV s⁻¹ (curve 3), 40 mV s⁻¹ (curve 4), 50 mV s⁻¹ (curve 5), 70 mV s⁻¹ (curve 6), 100 mV s⁻¹ (curve 7), 200 mV s⁻¹ (curve 8). (b) CVs recorded at NiCo₂O₄/GC electrode in 0.1 M NaOH supporting electrolyte and 17 µM DCF at various scan rates: 10 mV s⁻¹ (curve 1), 20 mV s⁻¹ (curve 2), 30 mV s⁻¹ (curve 3), 40 mV s⁻¹ (curve 4), 50 mV s⁻¹ (curve 5), 70 mV s⁻¹ (curve 6), 100 mV s⁻¹ (curve 7), 200 mV s⁻¹ (curve 8).