| Summary: | Ni(OH)<sub>2</sub> derived from an MOF template was synthesized as an electrode material for supercapacitors. The electrochemical performance of the electrode was adjusted by effectively regulating the morphology of Ni(OH)<sub>2</sub>. The evolution of electrochemical performance of the electrode with morphology of Ni(OH)<sub>2</sub> was highlighted in detail, based on which honeycomb-like Ni(OH)<sub>2</sub> was successfully synthesized, and endowed the electrode with outstanding electrochemical performance. For the three-electrode testing system, honeycomb-like Ni(OH)<sub>2</sub> exhibited a very high specific capacitance (1865 F·g<sup>−1</sup> at 1 A·g<sup>−1</sup>, 1550 F·g<sup>−1</sup> at 5 mV·s<sup>−1</sup>). Moreover, it also presented an excellent rate capability and cycling stability, due to 59.46 % of the initial value (1 A·g<sup>−1</sup>) being retained at 10 A·g<sup>−1</sup>, and 172% of initial value (first circle at 50 mV·s<sup>−1</sup>) being retained after 20,000 cycles. With respect to the assembled hybrid supercapacitor, honeycomb-like Ni(OH)<sub>2</sub> also displayed superior electrochemical performance, with a high energy density (83.9 Wh·kg<sup>−1</sup> at a power density of 374.8 W·kg<sup>−1</sup>). The outstanding electrochemical performance of Ni(OH)<sub>2</sub> should be attributed to its unique honeycomb-like structure, with a very high specific surface area, which greatly accelerates the transformation and diffusion of active ions.
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