K. Kiran Kumar, T. Suresh Kumar, B. Ravinder Reddy, Ch. Shilpa Chakra, K. Praveena, S. Katlakunta
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The UV-vis spectra reveal a red shift with Cr<sup>3+</sup> doping, reducing the bandgap energy (<i>E</i><sub><i>g</i></sub>) from 3.66 eV (<i>x</i> = 0.02) to 3.39 eV (<i>x</i> = 0.10). The electrochemical performance of the present samples was investigated using cyclic voltammetry (CV) and galvanostatic charge/discharge (GDC). The sample <i>x</i> = 0.10 exhibits high specific capacity of 143.671 F/g at a scan rate 5 mV/s. Therefore, the present samples may be useful for energy storage devices.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div><div><p>The tauc plots for <i>x</i> = 0.0–0.10 samples. 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The as synthesized powders were sintered at 1250 °C/4 h. All samples exhibit a cubic crystal structure and belong to Fd-3m space group. The lattice constant (<i>a</i>) increased from 8.085 Å (<i>x</i> = 0.0) to 8.128 Å (<i>x</i> = 0.04) and decreased for higher concentrations. The Fourier transform infrared spectra (FTIR) show tetrahedral and octahedral absorption bands in the region, 400 - 480 cm<sup>−1</sup> and 480 – 682 cm<sup>−1</sup>, respectively. The X-ray photoelectron spectroscopy confirmed the valence states of Zn, Al, Cr, and O. The UV-vis spectra reveal a red shift with Cr<sup>3+</sup> doping, reducing the bandgap energy (<i>E</i><sub><i>g</i></sub>) from 3.66 eV (<i>x</i> = 0.02) to 3.39 eV (<i>x</i> = 0.10). The electrochemical performance of the present samples was investigated using cyclic voltammetry (CV) and galvanostatic charge/discharge (GDC). The sample <i>x</i> = 0.10 exhibits high specific capacity of 143.671 F/g at a scan rate 5 mV/s. 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引用次数: 0
摘要
采用微波-水热法合成了 ZnAl2-xCrxO4 (x = 0.0-0.1) 陶瓷。所有样品均呈现立方晶体结构，属于 Fd-3m 空间群。晶格常数 (a) 从 8.085 Å (x = 0.0) 增加到 8.128 Å (x = 0.04)，浓度越高，晶格常数越小。傅立叶变换红外光谱（FTIR）显示，四面体和八面体吸收带分别位于 400 - 480 cm-1 和 480 - 682 cm-1 区域。X 射线光电子能谱证实了 Zn、Al、Cr 和 O 的价态。紫外-可见光谱显示，随着 Cr3+ 的掺入，带隙能 (Eg) 发生了红移，从 3.66 eV (x = 0.02) 降低到 3.39 eV (x = 0.10)。我们使用循环伏安法（CV）和电静态充放电法（GDC）研究了这些样品的电化学性能。在扫描速率为 5 mV/s 时，样品 x = 0.10 的比容量高达 143.671 F/g。因此，本样品可用于储能设备。
Structural, morphological, spectroscopic, and electrochemical properties of Cr doped ZnAl2O4
The ZnAl2-xCrxO4 (x = 0.0–0.1) ceramics were synthesized using microwave-hydrothermal method. The as synthesized powders were sintered at 1250 °C/4 h. All samples exhibit a cubic crystal structure and belong to Fd-3m space group. The lattice constant (a) increased from 8.085 Å (x = 0.0) to 8.128 Å (x = 0.04) and decreased for higher concentrations. The Fourier transform infrared spectra (FTIR) show tetrahedral and octahedral absorption bands in the region, 400 - 480 cm−1 and 480 – 682 cm−1, respectively. The X-ray photoelectron spectroscopy confirmed the valence states of Zn, Al, Cr, and O. The UV-vis spectra reveal a red shift with Cr3+ doping, reducing the bandgap energy (Eg) from 3.66 eV (x = 0.02) to 3.39 eV (x = 0.10). The electrochemical performance of the present samples was investigated using cyclic voltammetry (CV) and galvanostatic charge/discharge (GDC). The sample x = 0.10 exhibits high specific capacity of 143.671 F/g at a scan rate 5 mV/s. Therefore, the present samples may be useful for energy storage devices.
Graphical Abstract
The tauc plots for x = 0.0–0.10 samples. The UV-vis spectra reveal a red shift with Cr3+ doping, reducing the bandgap energy (Eg) from 3.66 eV (x = 0.02) to 3.39 eV (x = 0.10).
期刊介绍：
The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.
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