DEVELOPMENT OF NICKEL AND COPPER-DOPED COBALT  OXIDE (CO3O4 ) NANOPARTICLES FOR SUPERCAPACITOR  APPLICATION

Asfaw, Alemu

dc.contributor.author	Asfaw, Alemu
dc.date.accessioned	2022-12-20T12:30:44Z
dc.date.available	2022-12-20T12:30:44Z
dc.date.issued	2022-08
dc.identifier.uri	http://ir.bdu.edu.et/handle/123456789/14711
dc.description.abstract	Doping is an alternative strategy for the alteration of as-prepared nanomaterial’s to enhance their optical, structural, and electrical and electrochemical properties of electrode materials. In this study, Co3O4 , Ni and Cu -doped Co3O4 Nps at different dopant level (0.01-0.05 M) were successfully synthesized via cost effective and facile Co-precipitation method. The synthesized samples structural, functional, optical, morphological, thermal, and its surface area properties were examined by XRD, FTIR, UV-vis, SEM, TGA/DTA, and BET. The XRD analysis results show that prepared nanoparticles consists of Co3O4 crystalline with preferential orientation of (311) plane for all doping, confirmed cubic spinel structure of Co3O4 . It was also noted from XRD results, the crystallite size of pure Co3O4 , Ni and Cu doped Co3O4 were in the range of 35.74-34.70 nm. The FTIR-spectroscopy was used to determine the presence of functional groups in prepared sample (M-O) bonds, M =Ni, Cu, or Co)). From optical property analysis, the direct allowed band gap energies are calculated from Taucs plot. The optical band gaps were found to be 3.8 eV for pure Co3O4 2.85 eV for 5 % Ni doped Co3O4 , and 3.66 eV for 5 % Cu doped- Co3O4 Nps respectively are observed from UV-vis. The SEM image revealed the formation of agglomerated rock-type structures in the Co3O4 , Ni and Cu doped-Co3O4 Nps at high magnification. TGA/DTA analysis showed that Ni, and Cu-doping in Co3O4 leads to improved thermal decomposition properties. BET analysis showed the doping of Ni and Cu improved the surface area properties and further ionic diffusion rates of prepared samples. Cyclic voltammetry (CV) technique was used for electrochemical analysis of Ni and Cu doped Co3O4 nanoparticles. The higher specific capacitance of 449 F/g and 426 F/g at scan rate of 20 mV/s in 1 M KOH solution for 0.05 M Ni and 0.05 M cu doped Co3O4 was observed. Key words: Co3O4 Nanoparticles, doping, Co-precipitation method, Supercapacitors.	en_US
dc.language.iso	en	en_US
dc.subject	ENERGY CENTER	en_US
dc.title	DEVELOPMENT OF NICKEL AND COPPER-DOPED COBALT OXIDE (CO3O4 ) NANOPARTICLES FOR SUPERCAPACITOR APPLICATION	en_US
dc.type	Thesis	en_US