A novel hydrogen peroxide biosensor based on the Sn-ZnNPs/MWNTs nanocomposite film

► Electrodeposition of Zn-Sn nanocomparticles in deep eutectic solvents on the substance of MWNTs was realized and used to realize direct electron transfer in the bioelectrochemistry for the first time. ► The Hb/Zn-SnNPs/MWCNTs modified electrode were linearly related to H2O2 concentration in a wider linearity range from 0.5 to 840 μM and a lower detection limit of 0.11 μM. ► The present biosensor provide a good electrochemical sensing platform for redox proteins and has wide applications in biosensors and biocatalysis.