▎ 摘　　要

NOVELTY - The nano-generator has a water-absorbing layer whose component comprises hydrogel. Components of a photo-thermal layer comprise a photo-thermal conversion material and the hydrogel. A component of an electric layer comprises a contact electric material. An electric contact generates electric charge in process of separating and water contact. The hydrogel in the water absorbing layer and the photo-thermal layer is selected from one or more of polyacrylamide hydrogel, polyvinyl alcohol-based hydrogel, polyoxyethylene hydrogel and polyacrylic acid hydrogel. The photo-thermal conversion material is selected from one or more of carbon black, single-wall carbon nano-tube, multi-wall carbon nano-tube, graphene-pyrrole, Mxene and carbon nano-fibre yarn. USE - Gas-solid interface friction nano-generator for use in a seawater desalting device (claimed) to convert mechanical energy in water transpiration into electric energy promote evaporation of water, realize seawater desalination, and construct a hydroelectric multiple energy collecting system. ADVANTAGE - The method enables converting mechanical energy of a gas-solid interface friction nano-generator in water transpiration into electric energy, promoting evaporation of water, realizing seawater desalination, and ensuring better application prospect in constructing a hydroelectric multiple energy collecting system. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a preparation method of a gas-solid interface friction nano-generator; (2) a generating method. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of a gas-solid interface friction nano-generator. (Drawing includes non-English language text).