Influence of Fe and Ni Doped CuO Nanomaterials for High Performance Supercapacitors

Rajaguru, P.; nikandan, Venkatachalam Ma; Ezhilmathi, P.; Shankar, V. Uma; Sivaprakasam, P.; Krishnasamy, K.

doi:10.14233/ajchem.2020.22845

Cited by 3 publications

(1 citation statement)

References 46 publications

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“…Besides the potential features of pure CuO, many researchers have attempted to change its physical properties such as optical, electrical, and structural characteristics by doping substances to create new compounds. The doping influence of various transition metals such as Ni, 12,13) Zn, 14,15) Fe, 16) and Co 17) has been extensively reported. Among the various transition metals, Ni ions have similar ionic radii to Cu ions 13) and the wide bandgap energy of NiO ranges from 3.6 to 4.0 eV with low electrical resistivity and high thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Structural, Morphological, Optical Properties and Impedance Analysis of Solution-Processable Ni-Doped CuO Thin Films on ITO/Glass Substrates

Mai¹,

Loi

Minh

et al. 2023

Mater. Trans.

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Cupric-oxide-based thin films with various amounts of 0, 1, 2, 3, and 4 wt.% Ni doping were, in turn, deposited on ITO/glass substrates via a solution process. The 0.25 M concentrated solutions of copper (II) acetate monohydrate and nickel acetate tetrahydrate were used as starting materials mixed in ethanol solvent, in order to form the precursors. We obtained that the crystalline structure was not affected by the increase in Ni doping concentration as evidenced by X-ray diffraction patterns. The surface morphology observed by scanning electron microscope pointed out the presence of linked-structure nanoparticles. The influence of Ni doping on the optical bandgap width was evaluated by using ultravioletvisible spectrometry. We found that the optical bandgap should be direct, and it decreased from 2.69 to 2.38 eV for the range doped. Interestingly, we determined the relaxation time of the Ni-doped CuO/ITO/glass structure from measuring the electrochemical impedance spectroscopy, and it was 0.36 s for the undoped film, then gradually decreased to be 0.31, 0.11, 0.1, and 0.04 s with increasing the Ni doping concentration. This achievement result will serve as a foundation for the future photonic researches.

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Section: Introductionmentioning

confidence: 99%

Structural, Morphological, Optical Properties and Impedance Analysis of Solution-Processable Ni-Doped CuO Thin Films on ITO/Glass Substrates

Mai¹,

Loi

Minh

et al. 2023

Mater. Trans.

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Ru-doped nano grain hydrophilic copper hydroxide electrodes for supercapacitor application

Ghadage,

Kambale,

Fugare

et al. 2023

J Mater Sci: Mater Electron

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Enhanced linearity of CaCu3Ti4O12 by changing energy band structure induced by Fe3+ doping for high temperature thermistor application

Zhang

et al. 2022

Applied Physics Letters

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Polycrystalline oxide materials exhibit semiconductor properties due to grain boundary (GB) and grain characteristics, which enrich the variety of applications. However, how to regulate the energy band structure of grains and the potential barriers at GBs through defect engineering is crucial to achieve a high performance electronic device. Herein, it is found that Fe3+ ions can change the grain energy band structure of CaCu3Ti4O12 (CCTO) materials, which enhances the linearization of the resistance–temperature curve (ln ρ–1000/ T) in the high temperature region. First principles calculation indicates that Fe3+ doping narrows the forbidden band and induces new impurity energy levels in the forbidden band, which matches the conclusion that the resistivity–temperature dependence of grains shifts toward the low-temperature region as derived from impedance spectroscopy. This shift results in no monotonic variation in grain resistivity within the application temperature region, thus enhancing the linearity of the ln ρ–1000/ T curve of CCTO materials in the high temperature region. In addition, Fe3+ ions can modulate the activation energy of CCTO materials in a wide range by changing the activation energy of GBs, which broadens the temperature range of CCTO. The significance of this work lies not only in achieving linearization of CCTO materials for high temperature thermistor application, but more importantly, the method presented here provides an avenue for the study of polycrystalline semiconductor materials.

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Influence of Fe and Ni Doped CuO Nanomaterials for High Performance Supercapacitors

Cited by 3 publications

References 46 publications

Structural, Morphological, Optical Properties and Impedance Analysis of Solution-Processable Ni-Doped CuO Thin Films on ITO/Glass Substrates

Structural, Morphological, Optical Properties and Impedance Analysis of Solution-Processable Ni-Doped CuO Thin Films on ITO/Glass Substrates

Ru-doped nano grain hydrophilic copper hydroxide electrodes for supercapacitor application

Enhanced linearity of CaCu3Ti4O12 by changing energy band structure induced by Fe3+ doping for high temperature thermistor application

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