One-step facile synthesis of nickel–chromium layered double hydroxide nanoflakes for high-performance supercapacitors. Issue 5 (24th April 2020)

• Record Type: Journal Article
• Authors: Chen, Zuo; Deng, Hao; Zhang, Man; Yang, Zhiyu; Hu, Di; Wang, Yuchen; Yan, Kai
• Is Part Of: Nanoscale advances. Volume 2:Issue 5(2020)
• Page Start: 2099
• Page End: 2105
• Publication Date: 2020-04-24
• Subjects: 620.5
• DOI: 10.1039/d0na00178c
• Languages: English
• ISSNs: 2516-0230

Abstract

Abstract : Rational design and synthesis of efficient electrodes with pronounced energy storage properties are crucial for 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 Ni 2+ /Cr 3+ 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 Ni 2+ /Cr 3+ ratios, the Ni2 Cr1 -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 Ni2 Cr1 -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.