Abstract
Metallic silver nickel oxide honeycomb nanoarrays were synthesized via a surfactant-assisted hydrothermal route. The crystal structure of the Ag/NiO nanoarrays was confirmed by X-ray diffraction. X-ray photoelectron spectroscopy confirmed the valance state of the nickel, oxygen, and metallic silver. The morphological studies and energy dispersive X-ray spectroscopy revealed the honeycomb structured nanoarrays and the elemental distribution of the prepared sample, respectively. The three-electrode measurements showed that the Ag/NiO nanoarray is a suitable electrode material for supercapacitor applications, which delivers the maximum specific capacity of 824 C g−1 at a specific current of 2.5 A g−1. An Ag/NiO positive electrode-based asymmetric device was fabricated and tested. The asymmetric device yielded a high specific cell capacity of 204 C g−1 at a specific current of 2.5 A g−1 as well as a maximum energy density of 63.75 W h kg−1 at a power density of 2812.5 W kg−1. These results are comparable to those of (NiMH) metal hydride batteries.
Highlights
The electrical conductivity of the electrode active material plays a vital role in electrochemical reactions, which boost the power performance of supercapacitors
This paper reports the single route synthesis of metallic silver nickel oxide honeycomb nanoarrays architecture and its electrochemical performance of the supercapacitor electrode
The binding energy of the metallic silver indicated the presence of silver in the prepared NiO honeycomb nanoarrays, which was analyzed by X-ray photoelectron spectroscopy (XPS)
Summary
The electrical conductivity of the electrode active material plays a vital role in electrochemical reactions, which boost the power performance of supercapacitors. The electrical conductivity has been improved by the addition of graphene, CNT, acetylene black, and silver in NiO nanostructures electrodes[12,13,14,15,16,17,18,19,20,21]. Xu et al.[25] used nanofoaming to boost the electrochemical performance of the Ni@Ni(OH)[2] nanowires for ultrahigh volumetric supercapacitor electrodes They fabricated an asymmetric device (here they used Ni@Ni(OH)[2] nanowires as the positive electrode and graphene-carbon nanotubes as the negative electrode) and estimated a volumetric capacitance of 50 F g−1 at 2 A cm−3. This paper reports the single route synthesis of metallic silver nickel oxide honeycomb nanoarrays architecture and its electrochemical performance of the supercapacitor electrode. A hybrid supercapacitor device was fabricated using metallic silver with NiO honeycomb nanoarrays as the positive electrode and activated carbon as the negative electrode. The electrochemical performance of the hybrid supercapacitor device was tested
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