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Porous nano-flake-like α-Co(OH)2 thin films were prepared by electro-deposition on graphene nanosheets (GNS) and functionalized f-GNS at 1.0 V. The functionality of hydrophilic functional groups was increased by acid treatment to enhance electrode wettability and improve the compatibility between the electrode and the electrolyte. Hydrophilic functional groups can act as anchoring sites for the precursors,...
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