Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 41, Issue 22, Pages 9443-9453Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2016.04.050
Keywords
Hybrid supercapacitor; Layered double hydroxide; Nickel foam; Graphene; Energy density
Categories
Funding
- National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2014R1A1A2055740]
- Research AMP
- Development Office at University of Macau [SRG2015-00057-FST]
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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.
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