Covalently Aligned MoS2-CNTs Hetero-Architecture for High-Performance Electrochemical Capacitors.

Advanced 2D nanosheets architectures that fundamentally promote ions dynamic transportation and storage capacity, are significantly pivotal for high-performance electrochemical capacitors (ECs). However, the restacking microstructure, weak interlayer conduction and blocked electroactive utilization usually lead to a low energy density. Herein, we develop an ordered hetero-architecture of MoS 2 -CNTs, in which CNTs are vertically grafted within MoS 2 framework by C-Mo covalent bond. Benefiting from this in situ vertical-bridge, high-speed interlaminar conductivity, unimpeded ions-diffusion channels and sufficient pseudocapacitive reactivity, the MoS 2 -CNTs presents ultra-large capacitance (5485 F g -1 ) and good structural stability in KOH electrolyte. Moreover, the all-unified solid-state flexible ECs via direct-write printing construction deliver high energy density (226 mWh g -1 ), good capacitance (723 F g -1 ) and stable high/low temperature operating ability. Specifically, the flexible ECs can efficiently power display and wearable health monitoring device, which opens up a prominent way to design new multi-structural electrodes for next-generation energy-storage technology and wearable applications.

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