Issue 5, 2020

One-step facile synthesis of nickel–chromium layered double hydroxide nanoflakes for high-performance supercapacitors

Abstract

Rational design and synthesis of efficient electrodes with pronounced energy storage properties are crucial for supercapacitors. Herein, we report thin NiCr-layered double hydroxide nanoflakes (NiCr-LDNs) for a high-performance supercapacitor. These fabricated NiCr-LDNs, with various Ni2+/Cr3+ ratios, are one-step controllably synthesized through ultrasonication coupled with mechanical agitation, without hydrothermal treatment or extra exfoliation using organic solvents. Through comparison of different Ni2+/Cr3+ ratios, the Ni2Cr1-LDNs with a 4.7 nm thickness exhibited a superb capacitance performance of 1525 F g−1 at 2 A g−1, which is competitive with most previously reported layered double hydroxide (LDH)-based electrodes. These thin nanoflake structures have the potential to reduce the energy barrier and enhance the capture ability of electrolyte ions. Besides, an asymmetric supercapacitor (ASC) assembled using Ni2Cr1-LDNs achieved a remarkable energy density of 55.22 W h kg−1 at a power density of 400 W kg−1 and maintained high specific capacitance (over 81%), even after 5000 cycles. This work offers an efficient and facile route to fabricating LDH nanoflakes for boosting energy storage capabilities.

Graphical abstract: One-step facile synthesis of nickel–chromium layered double hydroxide nanoflakes for high-performance supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
03 mars 2020
Accepted
01 avr. 2020
First published
24 avr. 2020
This article is Open Access
Creative Commons BY license

Nanoscale Adv., 2020,2, 2099-2105

One-step facile synthesis of nickel–chromium layered double hydroxide nanoflakes for high-performance supercapacitors

Z. Chen, H. Deng, M. Zhang, Z. Yang, D. Hu, Y. Wang and K. Yan, Nanoscale Adv., 2020, 2, 2099 DOI: 10.1039/D0NA00178C

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