| Summary: | Ternary layered double hydroxide (LDH) materials have shown promising application in hybrid supercapacitors. However, the low electrical conductivity of LDHs is still a restriction to their performance. Herein, carbon nanotubes/cobalt–nickel–iron LDH (CNTs/CoNiFe-LDH) hybrid material was prepared by a one-step hydrothermal approach for the first time. The presence of CNTs improved the conductivity and surface area of the electrode, leading to an enhanced electrochemical performance. The CNTs/CoNiFe-LDH hybrid electrode exhibited high specific capacity 170.6 mAh g<sup>−1</sup> at a current density of 1 A g<sup>−1</sup>, with a capacity retention of 75% at 10 A g<sup>−1</sup>. CNTs/CoNiFe-LDH//AC asymmetric supercapacitor (ASC) was also assembled, which had high specific capacitance (96.1 F g<sup>−1</sup> at the current density of 1 A g<sup>−1</sup>), good cycling stability (85.0% after 3000 cycles at 15 A g<sup>−1</sup>) and high energy density (29.9 W h kg<sup>−1</sup> at the power density of 750.5 W kg<sup>−1</sup>). Therefore, the CNTs/CoNiFe-LDH material could be used for hybrid supercapacitor electrodes.
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