▎ 摘　　要

NOVELTY - Material comprises a polypropylene melt-blown non-woven fabric, and a graphene that is loaded on the polypropylene melt-blown non-woven fabric. USE - The material is useful for preparing electrode of electrochemical sensor, which is useful for detecting nitrite (all claimed). ADVANTAGE - The material has strong electrocatalytic effect to nitrite ion, which is suitable for electrochemical detection of nitrite ion, has excellent detection sensitivity and selectivity, and good actual application value. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing the material, comprising: spraying graphene oxide dispersion liquid on surface of polypropylene melt-blown non-woven fabric, thus ensuring uniform and light thin spraying, drying, repeating spraying and drying process for multiple times, and heating to completely dry; (2) electrode, comprising material; (3) electrochemical sensor, comprising material and/or electrode and (4) detecting nitrite, comprising detecting nitrite in substance to-be-detected by using electrochemical method.