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Both composition and nanostructure play vital roles in the electrochemical properties of the transition-metal compounds. Rational elemental doping and nanostructure design could accelerate the Faradaic redox reaction kinetics and increase the electroactive sites. Herein, we have successfully synthesized core−shell structure nanoarrays where (Ni,Co)Se 2 nanowires directly grow on activated carbon cloth as the conductive core to support an Mo-doped NiCoP nanosheet shell. This hierarchical nanoarray electrode exhibits a high areal capacity of 1.99 C/cm 2 at 2 mA/cm 2 (a gravimetric specific capacity of 797 C/g) and notable rate capability (1.54 C/cm 2 at 50 mA/cm 2 ). The asymmetric supercapacitor device assembled using (Ni,Co)Se 2 @Mo-NiCoP as the cathode and activated carbon as the anode exhibits a high energy density of 33.7 Wh/kg at a power density of 800 W/kg.

Herein, we have managed to conceive and fabricate a core-shell structured triangle-like array, where selenylation-treated MOF array in-situ grown on a conducting substrate as high conductive framework to support high...

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Transition metal phosphides (TMPs) are promising battery-type electrodes for hybrid supercapacitors (HSCs) due to their high electrical conductivity and electrochemical activity. Constructing TMPs with fast kinetics and stable structure is requisite to realize high-performance HSCs but remains a challenge. Herein, we incorporate Mo (or W) into NiCoP to form Ni-Co-Mo-P (or Ni-Co-W-P) heterostructures with a unique three-dimensional (3D) open morphology and modified electronic structure. Electrochemical analyses and density functional theory (DFT) calculations reveal that the incorporation of Mo/W enables NiCoP with optimized nanostructure, high conductivity, abundant reaction active sites and enhanced reaction kinetics. As a result, the designed Ni-Co-Mo-P heterostructure delivers a high areal capacity of 4.08 C cm −2 (703 C g −1 ) at 2 mA cm −2 and 3.25 C cm −2 at 30 mA cm −2 with a good cycling stability, superior to those of NiCoP and Ni-Co-W-P counterparts. The practical feasibility of the Ni-Co-Mo-P heterostructure is further demonstrated by an energy conversion and storage system consisting of commercial solar cell and Ni-Co-Mo-P// activated carbon (AC) device, which could obtain a high energy density of 53.3 W h kg −1 at a power density of 800 W kg −1 . All-solid-state Ni-Co-Mo-P//AC device further illustrates the superior flexibility and makes a strong candidate for wearable energy storage electronics.

The Ni–Co–P@LDH nanocomposites with outstanding mass specific capacitance were electrodeposited on one finger of a conductive interdigital Au/PET substrate with FeOOH nanosheets on the other to fabricate an AMSC device.