Synthesis of Ag/NiO Honeycomb Structured Nanoarrays as the Electrode Material for High Performance Asymmetric Supercapacitor Devices

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.

Water Photo-Electrooxidation Using Mats of TiO2 Nanorods, Surface Sensitized by a Metal–Organic Framework of Nickel and 1,2-Benzene Dicarboxylic Acid

“…The two peaks indexed to NiO also represented of the Ni-MOF spectra at 552 cm −1 . [52] The broad absorbance peak for TDNRs is situated at 1066 cm −1 and is indexed to Ti-O bonding. [53] The FTIR data confirmed the components of Ni-MOF/TDNRs, and illustrated the same description as that observed under FETEM.…”

Three-Dimensional Architectures in Electrochemical Capacitor Applications – Insights, Opinions, and Perspectives

“…However, RuO 2 has lost the attention of the industry because of the high production price (Augustyn et al, 2014). Other TMOs commonly used in energy storage devices are NiO (in hybrid systems) and MnO 2 (for pseudocapacitive storage) (Zhao et al, 2017;Sadayappan and Kwang-Sun, 2019). Their advantages include their low production cost and environmental friendliness.…”

“…This method is usually accompanied by high-temperature treatment or a strongly acidic environment (Lei et al, 2011). The use of these templates is mainly limited to carbonization of organic precursors to produce porous carbon networks (e.g., ordered mesoporous carbon) or for the preparation of materials that are stable against strong alkalis (Lee et al, 2000;Ryoo et al, 2001;Lee et al, 2004). Silica particles, used as templates, are firstly dispersed in the reaction solution.…”

Advances in in-situ characterizations of electrode materials for better supercapacitors

“…Several strategies, including optimization of electrolytes and construction of asymmetric capacitors or Li-ion capacitors, have been investigated to further improve the performance [28][29][30]. In the pursuit, a fundamental understanding of the electrochemical interface at the nanoscale and the behavior of ions in pores is critical.…”