Corresponding Author

Li-wei ZHU


Nickel/cobalt double hydroxide (Ni/Co-DH) has been prepared by facile hydrothermal one-step synthesis method using hexamethylene tetramine (HMT) as a homogeneous precipitating agent and cetyltrimethylammonium bromide (CTAB) as a shape-directing agent. With the hydrolysis of HMT and the use of CTAB, the Ni/Co-DH could be synthesized without additional alkali source, and in the meantime, the Ni/Co-DH exhibited a controlled mesopore size of 13.4 nm and a large BET surface area of 93.6 m2 •g-1 . The X-ray diffraction (XRD) pattern displays that the Ni/Co-DH existed as a mixture of α-Ni(OH)2-β-Co(OH)2. The scanning electron microscope (SEM) image shows that the as-prepared Ni/Co-DH took on a layered structure, which leads to a maximum specific capacitance of 1902 F•g-1 at a current density of 1 A•g-1. The specific capacitance remained 1250 F•g-1 when the current density increased to 8 A•g-1.

Graphical Abstract


Layered material, Cetyltrimethylammonium bromide, Nickel/cobalt double hydroxide, Electrochemical performance

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