Au/CeO2-chitosan composite film for hydrogen peroxide sensing

► A nanocomposite film consisting of the Au/CeO2-CS has been designed to construct an electrochemical biosensor for hydrogen peroxide assay. ► The GNPs were in situ synthesized on the surface of the CeO2NPs via a simple, environmentally friendly hydrothermal route. ► The resulting sensor presented excellent analytical performance for H2O2. ► Au/CeO2-CS composite film has potential application in the construction of desirable electrochemical biosensing interface.