Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 48, Issue 84, Pages 32739-32755Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2023.05.068
Keywords
Hydrothermal method; Nanorods; Supercapacitors; Specific capacitance; Charging-discharging; Energy density
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In this study, Mo-Cu dual-doped NiO nanorods were prepared using the hydrothermal method. Characterization techniques including X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy were employed to study the nanorods. Electrochemical analysis revealed their pseudocapacitive nature and high specific capacitance under certain conditions.
In this report, the hydrothermal method was adopted to prepare Mo-Cu dual-doped NiO nanorods. A single phase, with the face-centered cubic geometry was confirmed by an xray diffraction study in all the nanostructures. A drop in crystallite size with increasing Cu concentrations has a significant impact on the electrochemical performance. Scanning Electron Microscopy (SEM) revealed one-dimensional nanostructure, and the color map- ping ascertained the presence of all the incorporated dopants. The confirmation of grown nanorods was ascertained by high-resolution transmission electron microscopy (HRTEM). The electrochemical analysis revealed the pseudocapacitive nature based on the faradaic redox mechanism. A maximum specific capacitance of 1136 F/g was obtained at a 2 mV/s scan rate for Ni1.9Mo0.08Cu0.02O nanorods. The galvanostatic charge-discharge (GCD) analysis carried out at various current densities (1-8 Ag-1), established that the Ni0.9- Mo0.02Cu0.08O electrode displays a maximum specific capacitance of 502 F/g at 1 A/g. The Electrochemical Impedance Spectroscopy (EIS) established the perfect capacitive nature in the low-frequency region, with non-uniform distribution of ions. In conclusion, the high specific capacitance (502 F/g) of Ni0.9Mo0.02Cu0.08O electrode at 1 A/g, with energy density (21.10 Wh/kg) and power density (3.44 kW/kg) make it a fascinating candidate for the en- ergy storage devices. (c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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