▎ 摘　　要

The quantification of peroxynitrite (ONOO-, PON) and hydrogen peroxide (H2O2) is intrinsically difficult as both species show similar oxidative features located within a narrow potential. The sub-second lifetime of ONOO- at neutral pH further complicates the analysis. In this paper, we examine the electrocatalytic activity of cobalt phthalocyanine tetracarboxylic acid (CoPc-COOH) loaded reduced graphene oxide (rGO) films towards peroxynitrite and hydrogen peroxide detection. The rGO/CoPc-COOH matrix is synthesized by the reaction of graphene oxide (GO) and CoPc-COOH at 90 degrees C for 5 h under ultrasonication. The integration of CoPc-COOH and the reduction of GO to rGO was confirmed by X-ray photoelectron spectroscopy, FTIR, Raman, UV-vis spectroscopy and electrochemistry. The rGO/ CoPc-COOH film showed high electrocatalytic activity and specificity for ONOO- at anodic potential with a sensitivity of approximate to 11.5 +/- 1 nA nM(-1) and a peroxynitrite detection limit of approximate to 1.7 nM. The rGO/CoPc-COOH films further exhibited electrocatalytic reduction of H2O2 with a sensitivity of 14.5 mu A mM(-1) and a detection limit of approximate to 60 mu M for H2O2.