▎ 摘　　要

Reasonable structural design is significant to enable the performance in advanced energy storage devices. Herein, a 3D honeycomb-like CoMn2O4 nanoarchitecture (CMO) on nitrogen-doped graphene (NG) coating Ni foam (denoted as Ni/NG/CMO) flexible battery type electrode was prepared by a facile two-step hydrothermal strategy. The honeycomb-like CoMn2O4 arrays not only provide abundant active sites but can also be closely combined with the Ni foam/NG substrate, which enables high reversible capacity and good cycle stability during the long cycles. Benefiting from the compositional features and 3D honeycomb-like nanoarchitecture, the Ni/NG/CMO composite electrode displays improved electrochemical performance with remarkable specific capacity of 527.0C g(-1) at a current density of 1 A g(-1), outstanding rate capability (338.6C g(-1) even at 20 A g(-1)). In addition, a flexible binder-free supercapattery device has been assembled with Ni/NG/CMO as positive electrode and 3D Ni/NG as negative electrode. Such a supercapattery delivers a high energy density of 44.1 Wh.kg(-1) at 992.6 W kg(-1), 20.3 Wh.kg(-1) at 12430.0 W kg(-1) as well as excellent cycling durability. The 3D honeycomb-like Ni/NG/CMO could be considered as an advanced flexible battery-type material for high capacity and energy density fields. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.