Fig. 2

a CV curves of bare ITO and Co₂P/ITO electrode in 0.1 M PBS with and without 5.0 mM H₂O₂ at a scan rate of 100 mV s⁻¹. b CV curves of Co₂P/ITO electrode in 2.5 mM H₂O₂ at scan rates from 30 to 100 mV s⁻¹. Inset: The corresponding plot of current versus the scan rate. c Amperometric responses of Co₂P/ITO electrode with successive addition of H₂O₂ in 0.1 M PBS. d The calibration curve of steady current versus the concentration of H₂O₂