▎ 摘　　要

NOVELTY - Preparation of hydrogen peroxide electrochemical sensor involves preparing graphene oxide dispersion liquid by ultrasonically mixing graphene with ultrapure water and ultrasonically mixing with 1 wt.% chitosan solution, preparing platinum-palladium nanoparticles electrodeposition solution by mixing chloroplatinic acid solution and potassium chloropalladate solution with sulfuric acid, performing glassy carbon electrode pretreatment using alumina powder to polish and washing with ultrapure water, preparing graphene oxide/glassy carbon electrode modified electrode by drying the glassy carbon electrode with nitrogen air flow, adding graphene oxide dispersion liquid onto electrode surface and drying, infiltrating and drying with distilled water twice to remove unfixed nanomaterials on surface of the graphene oxide/glassy carbon electrode modified electrode, and electrodepositing platinum-palladium nanoparticles onto the graphene oxide/glassy carbon electrode modified electrode. USE - Preparation of hydrogen peroxide electrochemical sensor. ADVANTAGE - The method provides the hydrogen peroxide electrochemical sensor with high performance, wide detection range of 31.2 nmol/L to 92.2 μmol/L, lower detection limit of 31.2 nmol/L, and anti-interference ability. DETAILED DESCRIPTION - Preparation of hydrogen peroxide electrochemical sensor involves preparing graphene oxide dispersion liquid by ultrasonically mixing graphene with volume concentration of 2 mg/mL with ultrapure water and ultrasonically mixing with 1 wt.% chitosan solution with volume ratio of 5:1, preparing platinum-palladium nanoparticles electrodeposition solution by mixing 2 mmol/L chloroplatinic acid solution and 2 mmol/L potassium chloropalladate solution with 0.2 mol/L sulfuric acid, performing glassy carbon electrode pretreatment using 0.3 μm and 0.05 μm alumina powder to polish on suede in turn until the surface is mirror smooth and washing with ultrapure water for 5 minutes, preparing graphene oxide/glassy carbon electrode modified electrode by drying the glassy carbon electrode with nitrogen air flow, immediately adding graphene oxide dispersion liquid onto electrode surface and drying at room temperature for three hours, repeatedly infiltrating and drying with distilled water twice to remove unfixed nanomaterials on surface of the graphene oxide/glassy carbon electrode modified electrode, and electrodepositing platinum-palladium nanoparticles onto the graphene oxide/glassy carbon electrode modified electrode.