Abstract
Ternary layered double hydroxide (LDH) materials have shown promising application in hybrid supercapacitors. However, the low electrical conductivity of LDHs is still a restriction to their performance. Herein, carbon nanotubes/cobalt–nickel–iron LDH (CNTs/CoNiFe-LDH) hybrid material was prepared by a one-step hydrothermal approach for the first time. The presence of CNTs improved the conductivity and surface area of the electrode, leading to an enhanced electrochemical performance. The CNTs/CoNiFe-LDH hybrid electrode exhibited high specific capacity 170.6 mAh g−1 at a current density of 1 A g−1, with a capacity retention of 75% at 10 A g−1. CNTs/CoNiFe-LDH//AC asymmetric supercapacitor (ASC) was also assembled, which had high specific capacitance (96.1 F g−1 at the current density of 1 A g−1), good cycling stability (85.0% after 3000 cycles at 15 A g−1) and high energy density (29.9 W h kg−1 at the power density of 750.5 W kg−1). Therefore, the CNTs/CoNiFe-LDH material could be used for hybrid supercapacitor electrodes.
Highlights
In recent years, the development of high-performance energy storage devices has gained significant attention [1,2,3,4,5,6]
CoNiFe-Layered double hydroxide (LDH) nanosheets were grown in situ on Carbon nanotubes (CNTs) surface to form CNTs/CoNiFe-LDH composite under hydrothermal condition
A novel hybrid electrode material based on ternary CoNiFe-LDH and CNTs was firstly prepared through a one-step hydrothermal approach for hybrid supercapacitor applications
Summary
The development of high-performance energy storage devices has gained significant attention [1,2,3,4,5,6]. Hybrid supercapacitors are considered as novel energy storage devices due to their fast charge–discharge rate capability, long-term cycle stability, high energy density and power density [7]. CNT/Co3 S4 @NiCo LDH composites for hybrid supercapacitors [8]. Hybrid supercapacitors combine a supercapacitor-type electrode (such as carbon materials) with a battery-type electrode (such as transition metal oxides/hydroxides) into a single device [9,10,11,12,13]. Layered double hydroxide (LDH) materials, with high reversible charge/discharge abilities, structure-tunability, high specific capacity and environmental friendliness, have been extensively used as battery-type electrodes [14,15]. Nickel- or cobalt-based LDH materials have been investigated as outstanding electrodes for hybrid supercapacitors, such as CoAl-LDH [16], NiAl-LDH [17], CoNi-LDH [18,19], NiFe-LDH [20] and so on
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