Search

The synthesis of layered nanorod arrays with a core‐shell structure is considered to be a viable strategy to improve the electrochemical property of electrode materials. Herein, we have successfully designed and fabricated layered MoO3‐MnNi LDH@Cu(OH)2/CF(MO‐MN LDH@COH) core‐shell nanorods through a handy in‐situ oxidation reaction followed by a hydrothermal synthesis, which consist of ordered Cu(OH)2 nanorods and ultra‐thin MoO3‐MnNi LDHs nanosheets. The MO‐MN LDH@COH which is utilized as the cathode in three electrodes exhibits superior electrochemical property. The specific capacity of prepared electrode is 16913 mF cm−2 under a current density of 2 mA cm−2, which is superior to its counterparts of COH, MN LDH@COH‐0, MO‐MN LDH@COH‐0.5 and MO‐MN LDH@COH‐2. What's more, the cycling stability reaches 83.33 % capacitance retention after 5000 cycles under the current density of 30 mA cm−2. When a solid‐state asymmetric supercapacitor (ASC) device (MO‐MN LDH@COH//AC) is fabricated, it could keep a household LED screen running for 27 minutes, verifying the immense commercial potential. Overall, this unique MO‐MN LDH@COH nanocomposite with excellent electrochemical performance should envision great practical application potential. [ABSTRACT FROM AUTHOR]

• Ti 3 C 2 T x MXene based foam (MGC) is fabricated through a template method. • Interconnected MXene/rGO network renders the foam with good compressibility. • The MGC/PVA-H 2 SO 4 composite foam can be compressed into flexible film. • The assembled supercapacitor devices show good reliability under varied deformation states. Free-standing electrodes with high electrical conductivity, good deformability and durability are critical for flexible electronics, especially in field of wearable energy storage devices. Here, three dimensional (3D) Ti 3 C 2 T x MXene/reduced graphene oxide (rGO)/carbon (MGC-500) hybrid electrode fabricated by the simple template method is presented. Commercial melamine foam (MF) worked as template not only enables the Ti 3 C 2 T x /rGO nanosheets to form a porous architecture, but also introduces the heteroatom nitrogen into the Ti 3 C 2 T x /rGO nanosheets during the annealing process. The as-prepared MGC-500 electrode shows a gravimetric capacitance of 276F g−1 at a current density of 0.5 A g−1. When the MGC-500 hybrid electrodes are assembled into an all solid-state supercapacitor, it shows a stable electrochemical performance at different compressive strains. Notably, we find that the MGC-500 foam electrode coated with PVA-H 2 SO 4 gel electrolyte can be compressed into flexible film at 80% of compression. And the supercapacitor devices assembled by the film also exhibit stable capacitance under different modes of deformations such as bending and twist. The developed template approach offers a simple strategy to fabricate free-standing Ti 3 C 2 T x MXene electrode for energy storage devices that can withstand varied deformations, and also can be extended to other members of the large MXene family. [ABSTRACT FROM AUTHOR]