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The rapid development of portable electronics and hybrid vehicles requires electrochemical capacitors (ECs) with excellent integrated performances. Herein, we report such an EC based on the dense graphene hydrogel films (packing density = 1.18 ± 0.01 g cm−3) prepared by hydrothermal reduction of highly oxidized graphene oxide (HGO) sheets with lateral dimensions of 1–2 μm, followed by mechanical compression...
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