Journal
ELECTROCHIMICA ACTA
Volume 302, Issue -, Pages 1-9Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.01.187
Keywords
Ni-Fe LDHs; Nickel foam; Graphene; Electrodeposition; Flexible supercapacitors
Categories
Funding
- Centre National de la Recherche Scientifique (CNRS)
- University of Lille - Sciences and Technologies
- Hauts-de-France region
- Chinese government
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High-performance electrode materials consisting of intertwined caterpillar-like NiFe layered double hydroxide bridges coated on reduced graphene oxide modified Ni foam (NiFe LDHs/rGO/NF) were prepared via a facile two-step electrodeposition method. First, rGO was electrochemically coated onto NF at a constant potential of -1.2 V vs. SCE for 600 s. Then NiFe LDHs of different Ni to Fe ratios were electrodeposited onto the formed rGO/NF electrodes at -1.2 V vs. SCE for 10 s. Under optimized conditions, NiFe LDHs/rGO/NF composites displayed a high specific capacitance of 1462.5 F g(-1) at a current density of 5 A g(-1) and retained about 64.7% of the original capacitance after 2000 cycles. Furthermore, a flexible asymmetric supercapacitor was prepared using NiFe LDHs/rGO/NF as the cathode and mesoporous carbon (MC) coated on NF as the anode. The supercapacitor exhibited an energy density of 17.71 Wh kg(-1) at a power density of 348.49 W kg(-1). All of these findings suggest that the new electrodes developed in this work hold a potential application prospect in flexible energy storage devices. (C) 2019 Elsevier Ltd. All rights reserved.
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