▎ 摘　　要

NOVELTY - A nanocomposite comprises: at least one layer comprising graphene; and manganese oxide nanowires, where an average length of the nanowires is greater than 10 mu m and an average diameter of the nanowires is between 5-100 nm. USE - The nanocomposite is useful in producing a film (claimed). DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a film, comprising the nanocomposite on a surface of a support; and (2) a free standing membrane comprising: layers comprising graphene self-assembled with manganese oxide nanowires, where an average length of the nanowires is greater than about 10 mu m and an average diameter of the nanowires is between 5-100 nm.