Abstract
Amorphous Ni-Mn bimetallic hydroxide film on the three-dimensional nickle foam (NF)-supported conductive Ni3S2 nanosheets (denoted as Ni-Mn-OH@Ni3S2/NF) is successfully synthesized by an ultrafast process (5 s). The fascinating structural characteristic endows Ni-Mn-OH@Ni3S2/NF electrodes better electrochemical performance. The specific capacitance of 2233.3 F g−1 at a current density of 15 A g−1 can achieve high current density charge and discharge at 20/30 A g−1 that the corresponding capacitance is 1529.16 and 1350 F g−1, respectively. As well as good cycling performance after 1000 cycles can maintain 72% at 15 A g−1. The excellent performance can be attributed to unique surface modification nanostructures and the synergistic effect of the bimetallic hydroxide film. The impressive results provide new opportunity to produce advanced electrode materials by simple and green route and this material is expected to apply in high energy density storage systems.
Highlights
In recent years, with the increasing energy consumption and environmental degradation problems, great strive have been made to develop alternative energy sources and high-power energy storage systems[1,2]
We present a facile method of growing Ni-Mn bimetallic hydroxide (Ni-Mn-OH) films on Ni3S2 nanosheet arrays which supported by nickel foam (NF), achieving excellent electrochemical performance and cycling stability for supercapacitors
Futher structural details of Ni-Mn-OH@Ni3S2/NF were displayed in high resolution transmission electron microscopy (HRTEM)
Summary
With the increasing energy consumption and environmental degradation problems, great strive have been made to develop alternative energy sources and high-power energy storage systems[1,2]. Nickel[11,12,13,14], manganese-based[15,16,17] hydroxides/oxides and their compounds[18,19,20,21] have been recognized as promising electrode materials because of their low toxicity, low cost, great structures and morphology flexibility[22,23,24,25,26,27,28] They usually exhibit poor cycling stability and cannot tolerate charge/ discharge at high current density due to their inferior conductivity which limits the electron transport. These electrochemical performances of Ni-Mn-OH@ Ni3S2/NF are very outstanding in the reported supercapacitor systems and these properties suggested a logical experimental method for improving the supercapacitors performance
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