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The three-dimensional (3D) lawn-shaped Co-Zn(OH)F nanoneedle arrays have been directly grown on Ni foam by a hydrothermal method. The morphological evolution process of Co-Zn(OH)F has been investigated by scanning electron microscopy (SEM) at different time intervals in detail. Owing to the high activity of the well-ordered Co-Zn(OH)F nanoneedles with a diameter of about 50nm at the sharp tip, the...
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