Hierarchical NiCo-layered double hydroxide nanoscroll@PANI nanocomposite for high performance battery-type supercapacitor

In this paper, a facile strategy is developed to fabricate hierarchical NiCo layered double hydroxide (NiCo-LDH) and polyaniline (PANI) composite. A PANI nanolayer firstly uniformly covers the surface of carbon cloth (CC) by electrodeposition, followed by the growth of NiCo-LDH nanoscrolls via a hydrothermal process. The introduction of the PANI nanolayer plays a critical role in realizing the growth of NiCo-LDH nanoscroll, which possesses huge specific surface area and better electrochemical performance. The NiCo-LDH@PANI@CC nanocomposite delivers an excellent specific capacitance of 1835 F g(-1) (901C g(-1)) at 1 A g(-1), outstanding rate capability with a capacitance retention of 81% from 1 A g(-1) to 10 A g(-1) and good cycling ability with a capacitance retention of 78% after 3000 cycles. In addition, the asymmetric supercapacitor assembled by the NiCo-LDH@PANI@CC and active carbon supplies a good energy density of 26.5 Wh kg(-1) at a power density of 728.2 W kg(-1) and excellent cycling stability with a capacitance retention of 78% after 5000 cycles. (C) 2020 Elsevier Ltd. All rights reserved.