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Hierarchical Cobalt‐Nickel Double Hydroxide Arrays Assembled on Naturally Sedimented Ti3C2Tx for High‐Performance Flexible Supercapacitors

Hierarchical Cobalt‐Nickel Double Hydroxide Arrays Assembled on Naturally Sedimented Ti3C2Tx for... Flexible electrodes with excellent energy storage and conversion properties that can be produced by a simple process are highly desirable for supercapacitors. Herein, Cobalt‐Nickel double hydroxide (CoNi‐DH) micro‐nanosheet arrays are prepared uniformly on naturally sedimented Ti3C2Tx films by an etching‐deposition‐growth process to form a CoNi‐DH@Ti3C2Tx heterostructure. The naturally sedimented Ti3C2Tx film serves as the substrate to minimize aggregation of the CoNi‐DH nanoarrays to enhance the electrical conductivity. Furthermore, the hierarchical structure comprised of the CoNi‐DH interconnected nanoarrays promotes electrolyte access. By taking advantage of the excellent electrical conduction and high theoretical specific capacitance, the flexible CoNi‐DH@Ti3C2Tx electrode in the supercapacitor delivers a superior specific capacitance of 919.5 F g−1 at 1 A g−1, and remarkable capacitance retention of 89.6% after 5000 cycles at 20 A g−1. Density‐functional theory calculations are performed to investigate the charge density difference and partial density of states of CoNi‐DH@Ti3C2Tx and the theoretical assessment suggests that the chemical bonds between Ti3C2Tx and CoNi‐DH are critical to the charge transport, electrical conductivity, and structural stability. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Sustainable Systems Wiley

Hierarchical Cobalt‐Nickel Double Hydroxide Arrays Assembled on Naturally Sedimented Ti3C2Tx for High‐Performance Flexible Supercapacitors

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References (58)

Publisher
Wiley
Copyright
© 2022 Wiley‐VCH GmbH
eISSN
2366-7486
DOI
10.1002/adsu.202100371
Publisher site
See Article on Publisher Site

Abstract

Flexible electrodes with excellent energy storage and conversion properties that can be produced by a simple process are highly desirable for supercapacitors. Herein, Cobalt‐Nickel double hydroxide (CoNi‐DH) micro‐nanosheet arrays are prepared uniformly on naturally sedimented Ti3C2Tx films by an etching‐deposition‐growth process to form a CoNi‐DH@Ti3C2Tx heterostructure. The naturally sedimented Ti3C2Tx film serves as the substrate to minimize aggregation of the CoNi‐DH nanoarrays to enhance the electrical conductivity. Furthermore, the hierarchical structure comprised of the CoNi‐DH interconnected nanoarrays promotes electrolyte access. By taking advantage of the excellent electrical conduction and high theoretical specific capacitance, the flexible CoNi‐DH@Ti3C2Tx electrode in the supercapacitor delivers a superior specific capacitance of 919.5 F g−1 at 1 A g−1, and remarkable capacitance retention of 89.6% after 5000 cycles at 20 A g−1. Density‐functional theory calculations are performed to investigate the charge density difference and partial density of states of CoNi‐DH@Ti3C2Tx and the theoretical assessment suggests that the chemical bonds between Ti3C2Tx and CoNi‐DH are critical to the charge transport, electrical conductivity, and structural stability.

Journal

Advanced Sustainable SystemsWiley

Published: Mar 1, 2022

Keywords: flexible electrodes; hierarchical structures; high‐rate capability; naturally sedimented; supercapacitors; Ti 3 C 2 T x

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