Journal
ELECTROCHIMICA ACTA
Volume 376, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.138040
Keywords
NiCo-LDH; Ti3C2Tx; Electrostatic self-assembly; Supercapacitors
Categories
Funding
- National Natural Science Foundation of China [21706019]
- Natural Science Foundation of Shanxi Province [201801D121284, 201901D211217]
- Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi
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The novel NiCo-LDH/Ti3C2Tx exhibits excellent electrochemical performance, high specific capacity, and cycling stability, attributed to its unique three-dimensional porous structure and high electrical conductivity.
Nickel cobalt layer double hydroxides (NiCo-LDH) have high theoretical capacity for energy storage, but suffer from low electrical conductivity and sluggish charge transfer kinetics. Herein, three-dimensional (3D) porous flower-like NiCo-LDH/Ti3C2Tx is facilely fabricated via the electrostatic self-assembly of metal-organic frameworks and Ti3C2Tx followed by the ion-exchange reaction. The as-prepared NiCoLDH/Ti3C2Tx-5 delivers a high specific capacity of 635.7 degrees C g(-1) at 1 A g(-1), and still remains 382.3 degrees C g(-1) at 20 A g(-1). Furthermore, the corresponding asymmetric supercapacitor coupled with activated carbons achieves high energy density of 44.6 W h kg(-1) under the power density of 852.5 W kg(-1), and indicates remarkable cycling performance (85.71% of capacitance retention after 10,0 0 0 cycles). The outstanding electrochemical performance is assigned to 3D porous structure and high electrical conductivity, which not only increases the contract area between electrodes and electrolyte, but also enhances the ion diffusion and charge transfer kinetics. (C) 2021 Elsevier Ltd. All rights reserved.
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