Flexible CoAl LDH@PEDOT Core/Shell Nanoplatelet Array for High‐Performance Energy Storage

Abstract

A CoAl-layered double hydroxide (LDH)@poly(3,4-ethylenedioxythiophene) (PEDOT) core/shell nanoplatelet array (NPA) is grown on a flexible Ni foil substrate as a high-performance pseudocapacitor. The LDH@PEDOT core/shell NPA shows a maximum specific capacitance of 649 F/g (based on the total mass) by cyclic voltammetry (scan rate: 2 mV/s) and 672 F/g by galvanostatic discharge (current density: 1 A/g). Furthermore, the hybrid NPA electrode also exhibits excellent rate capability with a specific energy of 39.4 Wh/kg at a current density of 40 A/g, as well as good long-term cycling stability (92.5% of its original capacitance is retained after 5000 cycles). These performances are superior to those of conventional supercapacitors and LDH NPA without the PEDOT coating. The largely enhanced pseudocapacitor behavior of the LDH@PEDOT NPA electrode is related to the synergistic effect of its individual components: the LDH nanoplatelet core provides abundant energy-storage capacity, while the highly conductive PEDOT shell and porous architecture facilitate the electron/mass transport in the redox reaction.

Investigation of the Electrochemical Properties of CoAl-Layered Double Hydroxide/Ni(OH)2

“…In addition, the unique layered structure has good conductivity, and suitable mesopore distribution, which improves the faradaic redox reaction and greatly enhances the electrochemical performance. 31 The …”

Hierarchical layered double hydroxide nanocomposites: structure, synthesis and applications

“…12A), in which the LDH core provided high energy storage capacity, and the polymer shell and its porous structure facilitated electron/mass transport in the redox reaction. 19 The LDH@PEDOT core-shell NPA showed a maximum specific capacitance of 649 F g À1 by cyclic voltammetry (scan rate was 2 mV s À1 ) and 672 F g À1 by galvanostatic discharge (current density was 1 A g À1 ) ( Fig. 12B and C).…”

Transition metal oxides/hydroxides nanoarrays for aqueous electrochemical energy storage systems

“…Yuan et al [72] and Zhao et al [73] )), have attracted increasing interest from both academic and industrial angles due to their wide applications in various areas [74]. Recently, LDHs with vertically aligned structures have exhibited great potential in SCs [75][76][77][78]. Gu et al [79] prepared a NiTi-LDH nanosheet film by a two-step hydrothermal process, which showed a high areal capacitance of 10.37 F cm −2 at 5 mA cm −2 .…”