Abstract
Nickel cobalt layered double hydroxides (NiCo-LDHs) show great potential as electrode materials of battery-type supercapacitors, while the intrinsic low conductivity and possible agglomeration limit its wider application. In this work, a hierarchical composite material with a core-shell structure was prepared by self-assembling NiCo-LDHs nanosheets on dual surface-modified halloysite nanotubes (D-HNTs) via in-situ electrodeposition and hydrothermal method. HNTs were pretreated by a dual surface modification for the first time including a carbonization process and cobalt doping to enhance electrical conductivity and chemical stability. This multicomponent nanocomposite, NiCo-LDH/D-HNTs, shows a three-dimensional construction and has a specific capacity of 1401.4 C g-1 at 1 A g-1, a rate capability of 52.9% increasing the current density to 30 A g-1, and cycling stability of 80.8% after 2000 cycles. With the tubular support, the electrochemical properties of NiCo-LDHs can be extended in addition with the pseudocapacitance of HNTs. Besides the excellent electrochemical performance and the green preparation process, NiCo-LDH/D-HNTs nanocomposites possess many advantages of abundance in nature, hydrophilicity, low cost and scalability. This nanocomposite can be considered as a promising, environmentally friendly, and cost-effective electrode material for supercapacitors and other energy storage devices.
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