▎ 摘　　要

NOVELTY - Preparation of electrochemical sensor involves applying ferromagnetic/graphene nanocomposite on an electrode surface and performing electrochemical deposition process to deposit noble metal to the surface of the composite. The ferromagnetic/graphene nanocomposite is prepared using soluble ferric salt and ferromagnetic divalent metal salt as raw materials. The ferromagnetic divalent metal salt is zinc salt, cobalt salt, nickel salt, manganese salt or copper salt. USE - Preparation of electrochemical sensor used for detecting hydrogen peroxide. ADVANTAGE - The method provides electrochemical sensor having high response speed and sensitivity, and excellent stability and selectivity. The ferromagnetic/graphene nanocomposite has excellent catalytic performance.