Calligraphy-inspired brush written foldable supercapacitors

We demonstrate a highly effective approach to coating graphene films onto rough or even crumpled substrates by using a Chinese brush. The produced graphene films are used as electrodes for all-solid-state foldable supercapacitors. By making series or parallel connections, the energy storage performance of the all-solid-state foldable supercapacitors can be adjusted to different output voltages and currents.151