Preparation and characterization of NiFe2O4 thin films for supercapacitor applications

IF 1.4 4区材料科学 Q3 CRYSTALLOGRAPHY

Phase Transitions Pub Date : 2022-09-20 DOI:10.1080/01411594.2022.2122825

V. A. Jundale, D. A. Patil, A. A. Yadav

引用次数: 2

Abstract

ABSTRACT Mesoporous NiFe2O4 thin films have been prepared by chemical spray pyrolysis. The films are characterized by XRD, FESEM, EDAX, UV-Visible spectroscopy, DC electrical resistivity and electrochemical measurements. XRD result shows the cubic crystal structure with Fd-3 m (227) space group. Crystallite size is found in the range of 14–21 nm. FESEM showed crack free, well defined, uniform, mesoporous spherical grain-like surface morphology. EDAX study confirmed nearly stoichiometric deposition. The optical absorption studies confirmed direct allowed type transition with bandgap in the range of 2.09–2.29 eV. The films showed room temperature electrical resistivity of 2.34 × 104 Ωcm. The NiFe2O4 thin film spray deposited at 450°C exhibited a specific capacitance of 591 Fg−1 at a scan rate of 5 mV·s−1 from CV and specific capacitance of 632 Fg−1 at a current density of 0.5 Ag−1 from GCD. These findings recommend a constructive route towards the preparation of NiFe2O4 electrodes for high-performance electrochemical supercapacitors.

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超级电容器用NiFe2O4薄膜的制备与表征

采用化学喷雾热解法制备了介孔NiFe2O4薄膜。通过XRD、FESEM、EDAX、紫外可见光谱、直流电阻率和电化学测试对薄膜进行了表征。XRD结果显示Fd-3具有立方晶体结构 m（227）空间群。晶粒尺寸在14-21之间 nm。FESEM显示出无裂纹、清晰、均匀的中孔球形晶粒状表面形态。EDAX研究证实了近乎化学计量的沉积。光学吸收研究证实了带隙在2.09-2.29范围内的直接允许型跃迁电子伏特。薄膜的室温电阻率为2.34 × 104Ω在450°C下喷涂沉积的NiFe2O4薄膜显示出591的比电容 Fg−1，扫描速率为5 CV的mV·s−1和632的比电容电流密度为0.5时的Fg−1 来自GCD的Ag−1。这些发现为制备用于高性能电化学超级电容器的NiFe2O4电极提供了一条建设性的途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Phase Transitions 物理-晶体学

CiteScore

3.00

自引率

6.20%

发文量

审稿时长

1.4 months

期刊介绍： Phase Transitions is the only journal devoted exclusively to this important subject. It provides a focus for papers on most aspects of phase transitions in condensed matter. Although emphasis is placed primarily on experimental work, theoretical papers are welcome if they have some bearing on experimental results. The areas of interest include: -structural phase transitions (ferroelectric, ferroelastic, multiferroic, order-disorder, Jahn-Teller, etc.) under a range of external parameters (temperature, pressure, strain, electric/magnetic fields, etc.) -geophysical phase transitions -metal-insulator phase transitions -superconducting and superfluid transitions -magnetic phase transitions -critical phenomena and physical properties at phase transitions -liquid crystals -technological applications of phase transitions -quantum phase transitions Phase Transitions publishes both research papers and invited articles devoted to special topics. Major review papers are particularly welcome. A further emphasis of the journal is the publication of a selected number of small workshops, which are at the forefront of their field.