Abstract:

A zinc-based ordered micro-nano-plate electrode material was prepared in situ on the surface of foamed Ni by hy-drothermal method with Zn nitrate and Al nitrate as precursors and urea as precipitant.The structure and morphology of the product were studied and characterized by X-ray diffraction,scanning electron microscopy and transmission electron micro-scopy.The results showed that the product presented layered double hydroxides structure with a small amount of Al doping.The Zn_4-xAl_x（OH）₆CO₃·H₂O appeared a regular hexagonal structure with a diameter of 1~2 μm and a thickness of 80~200 nm.The electrochemical test of the three-electrode system showed that the electrode presented typical pseudo capacitance proper-ties.The specific capacitance of in-situ ordered growth of Zn_4-xAl_x（OH）₆CO₃·H₂O electrode was still as high as 1 022.3 F/gwhen the current density was 5 A/g.

Key words: layered double hydroxides, hydrothermal method, supercapacitor