Nickel–Cobalt Hydroxide Nanosheets Coated on NiCo₂O₄ Nanowires Grown on Carbon Fiber Paper for High-Performance Pseudocapacitors

Abstract

A series of flexible nanocomposite electrodes were fabricated by facile electro-deposition of cobalt and nickel double hydroxide (DH) nanosheets on porous NiCo2O4 nanowires grown radially on carbon fiber paper (CFP) for high capacity, high energy, and power density supercapacitors. Among different stoichiometries of CoxNi1-xDH nanosheets studied, Co0.67Ni0.33 DHs/NiCo2O4/CFP hybrid nanoarchitecture showed the best cycling stability while maintaining high capacitance of ∼1.64 F/cm(2) at 2 mA/cm(2). This hybrid composite electrode also exhibited excellent rate capability; the areal capacitance decreased less than 33% as the current density was increased from 2 to 90 mA/cm(2), offering excellent specific energy density (∼33 Wh/kg) and power density (∼41.25 kW/kg) at high cycling rates (up to150 mA/cm(2)).

Electrochemically Synthesis of Nickel Cobalt Sulfide for High‐Performance Flexible Asymmetric Supercapacitors

“…The Ni 3 S 4 /GF and Co 3 S 4 / GF were obtained with the same electrodeposition method of Ni–Co–S/GF. The anodic peaks in the cyclic voltammetry (CV) curves shift to higher potential with the increase of Ni 2+ concentration, which agrees with the electrochemical behaviors of cobalt sulfides and nickel sulfides reported previously 32. The Ni–Co–S‐2/GF sample has the smallest anodic and cathodic peaks separation in the batch, indicating its high reversibility for redox reactions.…”

Paper‐Based Electrodes for Flexible Energy Storage Devices

“…Different structures such as carbon film,76, 250 carbon foam,154, 251 carbon aerogel,26, 252 carbon hydrogel,253, 254 carbon paper,255, 256 and carbon cloth,80, 91 have been developed. Various morphologies like nanodots,257 nanotubes,49 nanoribbon,258 nanofiber,228 nanosheets,109 have also been explored to improve their performances.…”

Hierarchical layered double hydroxide nanocomposites: structure, synthesis and applications

“…nanowire) under the influence of electrophoresis to construct a 3D hierarchical metal oxide nanowire@LDH nanoarchitecture. 54 …”