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We developed a one-step hydrothermal strategy to fabricate Co 3 O 4 @NiCo 2 O 4 core–shell arrays on Ni foam. With this method, the ultralong NiCo 2 O 4 nanowires were self-assembled on the Co 3 O 4 nanowire arrays on Ni foam comfortably. Moreover, the eletrochemical properties of the hybird eletrodes were elucidated by cyclic voltammograms,...
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