Fig. 4

a Amperometric responses of Co₂P/ITO electrode with the addition of 1 mM H₂O₂ and other interfering species (10 mM NaCl, KCl, Glu, Fru, urea, L-Gly, L-Arg, L-Lys, AA; 1 mM DA, UA; 0.5 mM APAP) in 0.1 M PBS. b The cathodic peak currents of ten successive scanning CV curves in 50 μM H₂O₂. c Reproducibility of six Co₂P/ITO electrodes for detecting 1.0 mM H₂O₂. d Repeatability of Co₂P/ITO electrode for detecting 1.0 mM H₂O₂ eight times