Ni-CeO 2 spherical nanostructures for magnetic and electrochemical supercapacitor applications

The synthesis of nanoparticles has great control over the structural and functional characteristics of materials. In this study, CeO and Ni-CeO spherical nanoparticles were prepared using a microwave-assisted method. The prepared nanoparticles were characterized via thermogravimetry, X-ray diffracti...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2017-02, Vol.19 (6), p.4396-4404
Main Authors: Murugan, Ramachandran, Ravi, Ganesan, Vijayaprasath, Gandhi, Rajendran, Somasundharam, Thaiyan, Mahalingam, Nallappan, Maheswari, Gopalan, Muralidharan, Hayakawa, Yasuhiro
Format: Article
Language:English
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Summary:The synthesis of nanoparticles has great control over the structural and functional characteristics of materials. In this study, CeO and Ni-CeO spherical nanoparticles were prepared using a microwave-assisted method. The prepared nanoparticles were characterized via thermogravimetry, X-ray diffraction (XRD), Raman, FTIR, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometry (VSM) and cyclic voltammetry (CV). The pure CeO sample exhibited a flake-like morphology, whereas Ni-doped CeO showed spherical morphology with uniform shapes. Spherical morphologies for the Ni-doped samples were further confirmed via TEM micrographs. Thermogravimetric analyses revealed that decomposition varies with Ni-doping in CeO . XRD revealed that the peak shifts towards lower angles for the Ni-doped samples. Furthermore, a diamagnetic to ferromagnetic transition was observed in Ni-doped CeO . The ferromagnetic property was attributed to the introduction of oxygen vacancies in the CeO lattice upon doping with Ni, which were confirmed by Raman and XPS. The pseudo-capacitive properties of pure and Ni-doped CeO samples were evaluated via cyclic voltammetry and galvanostatic charge-discharge studies, wherein 1 M KOH was used as the electrolyte. The specific capacitances were 235, 351, 382, 577 and 417 F g corresponding to the pure 1%, 3%, 5% and 7% of Ni doped samples at the current density of 2 A g , respectively. The 5% Ni-doped sample showed an excellent cyclic stability and maintained 94% of its maximum specific capacitance after 1000 cycles.
ISSN:1463-9076
1463-9084
DOI:10.1039/c6cp08281e