Bubble-assisted fabrication of hollow CoMoO4 spheres for energy storage

In situ synthesis of Fe2O3 nanosphere/Co3O4 nanowire-connected reduced graphene oxide hybrid networks for high-performance supercapacitors

Three-dimensional (3D) hybrid networks consisting of reduced graphene oxide (rGO) sheets interconnected by Co₃O₄ nanowires (rGO/Co₃O₄), followed by the decoration of Fe₂O₃ nanospheres (NSs) (rGO/Co₃O₄@Fe₂O₃), were demonstrated by a facile hydrothermal method, with which the rGO/Co₃O₄ networks acted as nucleation sites for the in situ synthesis of Fe₂O₃ NSs. The intimate contacts between rGO, Co₃O₄ NWs and Fe₂O₃ NSs, which result in an excellent conductive behavior, provide a unique structure with huge potential for electrochemical property promoted electrochemical supercapacitors. The rGO/Co₃O₄@Fe₂O₃ hybrid networks as electrodes exhibit a high capacitance of 784 F g^-1 at 1 A g^-1 with 83% retention of the initial capacitance as the current density increases from 1 to 10 A g^-1, which is explained by the graphene-based interconnected structure owing to the advantages of accommodating the volume expansion between Co₃O₄ NWs and Fe₂O₃ NSs. The supercapacitor was assembled by applying a nickel aluminum layered double hydroxide (NiAl-LDH) structure and rGO/Co₃O₄@Fe₂O₃ as the electrode materials and yields an energy density of 70.78 W h kg^-1 at a power density of 0.29 kW kg^-1. The energy density can maintain 24.24 W h kg^-1 with 9.94 kW kg^-1.

Droplet-oriented construction of porous metal oxide hollow microspheres and their assembly into superstructures

A facile method for the construction of metal oxide hollow microspheres based on a droplet-oriented strategy has been developed.

A novel synthesis towards a vanadium pentoxide porous nanodisk film as a cathode material for advanced Li-ion hybrid capacitors

A V2O5 porous nanodisk thin film is synthesized through a simple hydrothermal and subsequent VO2 template oxidation strategy. For the first time, V2O5 is employed as a cathode rather than an anode to construct lithium-ion hybrid capacitors. This design effectively utilizes the intrinsic layered structure of V2O5 for facile Li+ intercalation and facilitates the charge balance with the capacitive electrode, enabling superior performance of the device.

A directly grown pristine Cu-CAT metal–organic framework as an anode material for high-energy sodium-ion capacitors

Conductive MOF nanowires with metal catechol structures are synthesized on compressed nickel foam and directly used in sodium ion capacitors for the first time.

Construction of layered hierarchical CoMoO4 nanostructured arrays for supercapacitors with enhanced areal capacitance

Layered hierarchical CoMoO₄ nano-structured arrays grown on nickel foam were designed and synthesized by a two-step hydrothermal method following by annealing. With the increase in the nearly three times loading mass of active materials, the specific capacitance of the layered hierarchical CoMoO₄ nano-structured arrays only shows a slight loss compared with the single-layer CoMoO₄ nano-structured arrays, which dramatically improved the areal capacitance from 2.47 to 6.79 F cm^-2. Also, the layered hierarchical CoMoO₄ nano-structured arrays showed 94.8% capacitance retention after 2500 cycles, which is mainly due to the well-designed layered hierarchical structure and good conductivity.

Humid atmospheric pressure plasma jets exposed micro-defects on CoMoO4 nanosheets with enhanced OER performance

A novel humid APPJs method was adopted to treat CoMoO₄ nanosheet arrays resulting in micro-defects and more reaction intermediates that led to an enhanced OER property.

Electrodepositing a 3D porous rGO electrode for efficient hydrogel electrolyte integration towards 1.6 V flexible symmetric supercapacitors

A reduced graphene oxide electrode with a 3D hierarchical architecture achieves 3D penetration of hydrogel, giving rise to a high-performance quasi-solid-state supercapacitor.