▎ 摘　　要

NOVELTY - Electret base material, is claimed. The electrolytic base material is obtained by depositing graphene on a polymer substrate with good electrode performance, preferably, the polymer with good electrode performance is PVDF or PANI, preferably the graphene is graphene oxide, preferably, the deposition is to drop the graphene aqueous solution on the polymer substrate with good electrode performance by using centrifugal force and uniformly coating the film. USE - The material is useful in dynamic electret filter element of polyvinylidene fluoride composite graphene. ADVANTAGE - The material: has excellent flame retardant property and dielectric performance; improves the dynamic electret air purification mechanism, catalytic mechanism of MOFs and high voltage electrostatic field fusion; and is suitable in device to ensure the excellent sterilizing and degrading gaseous pollutant and other comprehensive performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: a composite dynamic electret filter element comprising electret base material as electret; and a air purifying and sterilizing device, comprising composite dynamic electret filter element.