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a CV curves at different scan rates in 2 M KOH aqueous electrolyte. b Galvanostatic charge–discharge measurements at different current densities. Specific capacitances at c different current densities, d rate performances, and e long-term cycling performances of 3D Co–Al-LDHs (LDH: Co–Al-LDH, CNT carbon nanotubes, GNS graphene nanosheets, NS nanosheets, GO graphene oxide, rGO reduced graphene oxide)
