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

Title
Role of graphene on hierarchical flower like NiAl layered double hydroxide nickel foam graphene as binder free electrode for high rate hybrid supercapacitor
Author
Hui, Kwan-San
Keywords
Hybrid supercapacitor; Layered double hydroxide; Nickel foam; Graphene; Energy density
Issue Date
2016-05
Publisher
ELSEVIER SCIENCE BV
Citation
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.41, n.22, Page. 9443-9453
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. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0360319916303494http://hdl.handle.net/20.500.11754/68022
ISSN
0360-3199; 1879-3487
DOI
10.1016/j.ijhydene.2016.04.050
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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