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A combined delicate micro‐/nano‐architecture and corresponding surface modification at the nanometer level can co‐tailor the physicochemical properties to realize an advanced supercapacitor electrode material. Herein, nanosheets‐assembled nickel‐cobalt‐layered double hydroxide (NiCo‐LDH) hollow micro‐tunnels strongly coupled with higher‐Fermi‐level graphene quantum dots (GQDs) are reported. The unique...
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