Facile microemulsion synthesis of porous CuO nanosphere film and its application in lithium ion batteries

- Cu2(OH)2CO3 nanosphere films on Cu foil have been prepared by a facile microemulsion synthesis.
- Porous CuO nanosphere films can be prepared from Cu2(OH)2CO3 nanosphere film precursor.
- Porous CuO nanosphere films have better electrochemical properties than CuO nanorod films.