As a vital biological mediator and a widely used industrial oxidant,the accurate detection of hydrogen peroxide(H2O2)is of significance for both academic purpose and practical applications.Herein,we report a novel approach for the development of high performance electrochemical H2O2 sensor constructed by iron phthalocyanine(FePc)-based diyne-linked conjugated polymeric nanosheets(NSs),FePc-CP NSs.