▎ 摘　　要

NOVELTY - The device has an active layer comprising from 15 to 500 atomic layers of graphene. The active layer having a first surface and a second surface. The device is configured such that the first surface of the active layer is visible while the device is in use. A porous membrane comprises a liquid electrolyte. The membrane having a first surface and a second surface. The second surfaces of the active layer are in contact with the first surface of the porous membrane. The liquid electrolyte comprises metal ions. A metal ion source is in contact with the second surface of the porous membrane. A cathode layer having a first surface and a second surface. The first surface of the cathode layer is in contact with the metal ion source and a units for applying a controllably variable electric potential between the cathode layer and the active layer. USE - Graphene-based electro-optical device for controlling optical properties and emissivity of active layer used in multispectral display devices as adaptive reflectors and as indicators of state of charge of battery. ADVANTAGE - The device controls the optical properties and/or emissivity of the active layer in an efficient manner. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for varying optical properties of first surface of active layer of device; and (2) a method for making device. DESCRIPTION OF DRAWING(S) - The drawing shows a device consisting of multilayer graphene (anode).