A comparative study on the electrochemical properties of nanoporous nickel oxide nanowires and nanosheets prepared by a hydrothermal method

Abstract

Metal oxide nanostructures have been extensively used in electrochemical devices due to their advantages, including high active surface area and chemical stability. However, the electrochemical properties of metal oxides are strongly dependent on their structural characteristics. We performed a comparative study on the electrochemical performance of nanoporous nickel oxide (NiO) nanosheets and nanowires. The advanced nanoporous NiO nanomaterials were synthesized by a facile hydrothermal method followed by thermal calcination. The synthesized nanomaterials, as characterized by scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, X-ray diffraction, and nitrogen adsorption/desorption isotherms, demonstrated the nanoporosity and high crystallinity of the NiO nanosheets and nanowires. Cyclic voltammetry measurement was performed using a three-electrode system to evaluate the electrochemical properties of the synthesized materials. Results showed that the nanoporous NiO nanosheets possessed a higher current density than that of the nanowires by approximately ten times. Moreover, the nanoporous NiO nanosheets showed exceptionally high stability of almost 100%, after three cycles in strong alkaline environments, thereby suggesting possible application in electrochemical devices.

Mono- and bimetallic metal catalysts based on Ni and Ru supported on alumina-coated monoliths for CO2 methanation

“…The gaps between lattice fringes were approximately 0.15 and 0.24 nm, which correspond to the interspace of the (220) and (111) planes, respectively. 28,29 Other images (Fig. 3b) show lattice fringe distances of 0.17 and 0.20 nm corresponding to the (200) and (111) lattice planes, respectively, of fcc Ni.…”

Analysis of Charge Storage Behavior in Redox‐electrolyte Based Battery‐like‐systems: A Case Study on Zr‐doped Ceria

“…From the above equation, the diffusion layer thickness ( ) is calculated for various scan rates. The value of ‘D’ can be determined from the Randles‐Sevcik equation, as found in the literature …”

GLUCOSE SENSOR USING CYCLIC VOLTAMMETRIC METHOD BASED ON NiO/ITO ELECTRODE

“…NiO is one of the materials that has overcome these problems and is highly sensitive, inexpensive, and easy to fabricate. There is much research focusing on NiO materials because of various fabrication methods such as the sputtering method, hydrothermal [18], [19], etc. However, in order to form an electrode, it is necessary to have NiO fixed on the conductive substrate to ensure good adhesion and stability.…”