Role of graphene on hierarchical flower-like NiAl layered double hydroxide-nickel foam-graphene as binder-free electrode for high-rate hybrid supercapacitor

Zhang, Luojiang, Hui, K. N., Hui, K.S. ORCID: https://orcid.org/0000-0001-7089-7587, Chen, Xin, Chen, Rui and Lee, Haiwon (2016) Role of graphene on hierarchical flower-like NiAl layered double hydroxide-nickel foam-graphene as binder-free electrode for high-rate hybrid supercapacitor. International Journal of Hydrogen Energy, 41 (22). pp. 9443-9453. ISSN 0360-3199

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Abstract

In this work, a facile two-step hydrothermal method was reported to grow hierarchical flower-like NiAl layered double hydroxide (LDH) directly on 3D nickel foam (NF) which was further coated with 2D graphene nanosheets (GNS) layers as binder-free supercapacitor electrode. The positive and negative effects of GNS on the electrochemical performance of LDH-NF electrode were investigated in detail. The prepared LDH-NF/GNS electrode maintained an enhanced specific capacity of 165.6 C g-1 after 4000 cycles at a high current density of 40 A g-1. Furthermore, a hybrid supercapacitor, with LDH-NF/GNS and GNS-NF as the positive and negative electrodes, achieved an energy density (31.5 Wh kg-1 at a power density of 400 W kg-1) and super long-term cycle stability (a specific capacity of 67.2 C g-1 at 5 A g-1 after 5000 cycles with 80% retention). This study not only opens up the possibility of engineering LDH-NF/GNS into a promising electrode, but also highlights the positive and negative roles of GNS on LDH-NF as binder-free electrodes for further development of high-performance supercapacitors.

Item Type:	Article
Uncontrolled Keywords:	energy density,graphene,hybrid supercapacitor,layered double hydroxide,nickel foam
Faculty \ School:	Faculty of Science > School of Mathematics (former - to 2024)
UEA Research Groups:	Faculty of Science > Research Groups > Energy Materials Laboratory
Related URLs:	http://www.scopus.com/inward/record.url?...
Depositing User:	Pure Connector
Date Deposited:	10 Nov 2016 10:00
Last Modified:	23 Oct 2024 23:45
URI:	https://ueaeprints.uea.ac.uk/id/eprint/61300
DOI:	10.1016/j.ijhydene.2016.04.050

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