▎ 摘　　要

NOVELTY - Composite comprises porous metal oxide nanoclusters formed on graphene sheets. USE - Composite for a pseudocapacitor electrode, which further used for aqueous hybrid capacitor (claimed). ADVANTAGE - The composite exhibits a remarkable high energy density surpassing that of a conventional aqueous battery, and the full cells are in series within a some seconds with a high-speed universal serial bus (USB) charger, and has the effect of enabling super-fast charging that is charged. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) an aqueous hybrid capacitor comprises the composite for a pseudocapacitor electrode as an anode and/or a cathode; and (2) a method for producing a composite for a pseudocapacitor electrode, which involves porming nanoparticles of metal oxide on the graphene sheet, and after lithiation of the metal oxide nanoparticles formed on the graphene sheet, performing delithiation to form a porous metal oxide nanocluster.