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Novel massif-like Cu x O nanostructure was directly growing on Cu foam via a facile thermal oxidation method in air atmosphere. The massifs are about 5μm in mean diameter and 4μm in mean height, which consist of a large number of nanoparticles with mean size about 100nm. Cu x O nanowires that evolve from the particles locate at the laps of the massifs. Galvanostatic battery testing...
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