Electrochemical study of Nickel Oxide (NiO) nanoparticles from cactus plant extract
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MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.118
Electrochemical study of Nickel Oxide (NiO) nanoparticles from cactus plant extract Henok Gebretinsaea,b,c , Giday Welegergsb,c,d, N.Matinise a
b,c
, M. Maazab, c, Z. Y. Nurua,b,c
Adigrat University, Department of Physics, P.O.Box 50, Adigrat, Ethiopia
b
UNESCO - UNISA, Africa chair in nanoscience and Nanotechnology, College of Graduate Studies, Muckleneuk ridge, POBox 392, Pretoria-South Africa c
Nanosciences African Network, Materials Research Department, iThemba LABS
d
Debre Berhan University, Department of Chemistry, P.O.Box 544, Ethiopia P.O.Box 722, National Research Foundation, South Africa Corresponding author: Z.Y. Nuru Email: [email protected]
ABSTRACT P-type NiO powders with an average crystallite size of 16 nm as shown by x-ray diffraction analysis were produced via biosynthesis using cactus plant extract. SEM showed that the NiO powders consisted of particles with sizes in the 20-35 nm range. A cyclic voltammetric study of the NiO nanopowders showed a quasi-reversible redox processes with the NiO powder showing potential for pseudo capacitance. Through these findings the use of natural Cactus extracts is hereby shown to be a cost-effective and environmentally friendly alternative for preparing Nickel oxide nanosized powders that can be of use in a variety of energy storage applications.
INTRODUCTION Nanostructured materials have attracted great interest in both fundamental as well as applied research areas due to their outstanding physical and chemical properties and also promising applications in Nano devices.[1-9]
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Transition metal oxide nanoparticles have attracted interest due to their novelty in many properties. They significantly differ in many ways from their bulk properties such as size, surface effect and electrical properties. NiO, an important transitional metal oxide is a p-type semiconductor with a wide band gap in the range of 3.6 eV to 4.0 eV. NiO nanoparticles have an electronic properties that triggered applications such as electrochromic test devices, smart windows, electrochemical super capacitors, electrode in rechargeable lithium ion batteries and also in dye sensitized photocathodes.[10, 11] Electrochemical supercapacitors with their high power density, fast charge and discharge mechanism, environment friendliness, nontoxic nature and long life cycle are supreme energy storage deceives used to meet the urgent need in electrical and electronic devices [12, 13]. Therefore, nanostructured electrode materials such as wires, rods, spheres, etc have found to be promising alternatives with their significant properties. Such as improved life cycle is due to better accommodation of lithium insertion/removal strain, higher charge/discharge rates due to larger electrode
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