▎ 摘　　要

NOVELTY - A nanocomposite photocathode protective coating material comprises a quaternary nanocomposite material composed of nano titanium dioxide, cadmium selenide, graphene and polyaniline. The coating material is prepared by preparing nano titanium dioxide and cadmium selenide binary nanocomposite materials in situ by a concentrated emulsion template method, and physically mixing the binary nanocomposite materials with graphene and polyaniline to obtain a quaternary nanocomposite material. The concentrated emulsion template method refers to the formation of an oil-in-water system under the action of an emulsifier, where the volume ratio of the aqueous phase to the oil phase is 1:2-1:9. The oil phase is toluene, xylene or styrene. The mass ratio of the binary nanocomposite material to graphene is (20-30):1. The mass ratio of the binary nanocomposite material to polyaniline is (20-30):1. USE - Nanocomposite photocathode protective coating material. ADVANTAGE - The nanocomposite photocathode protective coating material containing polyaniline as film-forming substance enhances the interfacial bonding force between the coating material and the metal substrate without affecting the photoelectron transfer, improves the stability of the coating, and prolongs the service life of the coating material.