排序方式: 共有17条查询结果,搜索用时 15 毫秒
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Offor P. O. Nwanya Assumpta C. Omah A. D. Daniel-Mkpume C. C. Maaza Malik Okorie B. A. Ezema Fabian I. 《Journal of Solid State Electrochemistry》2017,21(9):2687-2697
Journal of Solid State Electrochemistry - Zinc sulphide thin films were deposited by chemical spray pyrolysis technique. The films were deposited at substrate temperatures of 300, 350 and... 相似文献
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Assumpta C Nwanya Daniel Obi Rose U. Osuji R. Bucher Malik Maaza Fabian I. Ezema 《Journal of Solid State Electrochemistry》2017,21(9):2567-2576
We used a simple chemical synthesis route to deposit nanorod-like cobalt oxide thin films on different substrates such as stainless steel (ss), indium tin oxide (ITO), and microscopic glass slides. The morphology of the films show that the films were uniformly spread having a nanorod-like structure with the length of the nanorods shortened on ss substrates. The electrochemical properties of the films deposited at different time intervals were studied using cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS). The film deposited after 20 cycles on ss gave the highest specific capacity of 67.6 mAh g?1 and volumetric capacity of 123 mAh cm?3 at a scan rate 5 mV s?1 in comparison to 62.0 mAh g?1 and 113 mAh cm?3 obtained, respectively, for its counterpart on ITO. The film electrode deposited after 20 cycles on ITO gave the best rate capability and excellent cyclability with no depreciation after 2000 charge–discharge cycles. 相似文献
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Tyona M. D. Jambure S. B. Osuji R. U. Maaza M. Lokhande C. D. Ezema Fabian I. 《Journal of Solid State Electrochemistry》2020,24(2):313-320
Journal of Solid State Electrochemistry - Photovoltaic (PV) performance of chemically synthesized indium-doped zinc oxide (IZO) nanorod electrodes has been investigated by photocurrent... 相似文献
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Raphael M. Obodo Nanasaheb M. Shinde Ugochi K. Chime Sabastine Ezugwu Assumpta C. Nwanya Ishaq Ahmad Malik Maaza Paul M. Ejikeme Fabian I. Ezema 《Current Opinion in Electrochemistry》2020
The high demand for long-lasting and portable energy storage devices with enhanced energy and power densities has attracted researcher's interest globally. The three-dimensional (3D) nickel foam is a promising electrode material for storing energy in various devices because they possess large surface area, are very conductive and enjoy a continuous permeable 3D system. This article provides a review and detailed information on the uses of 3D nickel foam-based electrodes with metal oxides/hydroxides of different morphologies for high-performance pseudocapacitors. We assess the limitations and future prospects of 3D nickel foam-based electrodes with metal oxides/hydroxides for industrial application towards enhancing pseudocapacitors' energy storage capability. 相似文献
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S. U. Offiah S. N. Agbo P. Sutta M. Maaza P. E. Ugwuoke R. U. Osuji F. I. Ezema 《Journal of Solid State Electrochemistry》2017,21(9):2621-2628
Aluminum-doped ZnO thin films with pebble-like structures have been successfully deposited on glass substrates by successive ionic layer adsorption reaction method. The effect of percentage composition of the aluminum dopant on the flower-like clusters of the ZnO nanostructures on the structure, morphology, and optical properties was investigated. The ZnO thin films which were crystallized in hexagonal wurtzite structures with crystallite sizes of 44, 51, 56, and 43 nm for the intrinsic and 1, 3, and 5% Al-doped ZnO thin films, respectively. Preferred orientation of crystallites is in all cases in [001] direction perpendicular to the sample surface The Raman spectroscopy revealed decrease in the intensity of the ZnO characteristic peak due to the substitution of the Zn2+ atoms by the Al3+ and attributed to potential fluctuations of the alloy disorder. The introduction of the Al3+ dopant significantly increased the optical band gap. 相似文献
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B. E. Ezema L. E. S. Akpanisi C. G. Ezema A. E. Onoabedje 《Journal of heterocyclic chemistry》2015,52(5):1411-1414
Ethyl 7‐(2‐ethoxy‐2‐oxoethyl)‐3‐phenyl‐[1–3]triazolo[5,1‐c][1,2,4]triazine‐6‐carboxylate (the parent compound) was synthesized by reaction of 4‐phenyl–1H‐1,2,3‐triazole‐5‐diazonium chloride with diethyl‐2‐oxopropane‐1,3‐dicarboxylate at cooling for 2 h. During the reaction of the parent compound with p‐toluenesulphonyl azide in triethylamine, the Dimroth rearrangement occurred to give the tricyclic compound. 相似文献
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Samson O. Aisida Ishaq Ahmad Ting-kai Zhao Malik Maaza Fabian I. Ezema 《Journal of Macromolecular Science: Physics》2020,59(5):295-308
AbstractSpinel ferrite based nanoparticle material has been at the forefront of contemporary nanotechnology for use in various industrial and biomedical applications. The preparation and characterization of zinc ferrite nanoparticles (ZFNPs) doped with polyvinyl alcohol (PVA) are reported in this work. The formulated ZFNP/PVAs were characterized using powder X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible spectroscopy, photoluminescence (PL) and a vibrating sample magnetometer (VSM). The XRD established the cubic spinel crystal structure of the as-prepared and calcined sample with an increase in the crystallite size after the calcination. The SEM analysis showed a spherical morphology within the range of 10-40?nm after calcination. The bandgap energy was enhanced after calcination. The PL analysis revealed a prominent peak in the UV band, which showed the characteristics of the formulated nanostructure. Transformation to a superparamagnetic nature was observed after calcination. It is noteworthy that after calcination of the formulated ZFNP/PVAs, the structural, optical, bandgap energy, morphology, photoluminescence and the magnetic properties were influenced and enhanced for various applications, chiefly for hyperthermia, magnetic resonance imaging, drug delivery and allied disciplines. 相似文献
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Solomon U. Offiah Mary O. Nwodo Assumpta C. Nwanya Sabestine C. Ezugwu Solomon N. Agbo Paulinus U. Ugwuoke Rose U. Osuji Maaza Malik Fabian I. Ezema 《Optik》2014
Room temperature deposition of PVP capped nanostructured NiO/Ni(OH)2 thin film, the morphological and optical characterizations by solution growth technique are reported. The nanostructured thin films which were deposited on optical glass substrates were annealed at different temperatures and then subjected to structural, morphological and optical characterizations. X-ray diffraction measurements of the films revealed that higher temperatures during the thermal treatment enhanced the crystallinity of the thin films. The SEM surface micrographs show non-interconnected uniformly deposited fibre-like structures with approximate lengths between 400 and 1200 nm. The optical band gap energy roughly decreased from about 2.7 eV to about 2.2 eV with thermal treatment. The absorbance of the thin films annealed at 300 and 400 °C was as high as 90% in the visible region of the electromagnetic spectrum. These materials could be useful in solar thermal conversion processes. 相似文献