Shape tailored nano-ceria as high performance supercapacitor electrode material

IF 3 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materialia Pub Date : 2024-09-16 DOI:10.1016/j.mtla.2024.102237

Trishanku Kashyap , Gitarthi Gogoi , Hirendra Das , Arishma Buragohain , Debajyoti Mahanta , Manash R. Das , Pranjal Saikia

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Abstract

Electrochemical energy storage devices herald a brighter future, offering efficient and sustainable solutions to meet the escalating global energy demands. The current work investigates the development and characterization of different ceria nanostructures (nanorod, nanocube, and nanopolyhedra) as effective electrode materials for supercapacitor applications. The electrode materials are systematically characterized using various spectroscopic and non-spectroscopic techniques. Galvanostatic charge-discharge, electrochemical impedance spectroscopy, and cyclic voltammetry techniques are used to evaluate the electrochemical performance of the electrode materials. The optimum material for the said application is cerium nanorod which has the maximum specific capacitance of 437.27 F/g in acid electrolytes. The current-voltage (I-V) characteristics of the ceria nanostructures exhibit hysteresis behavior; ceria nanorod showing coexistence of memristive and memcapacitive nature. The loop area of the hysteresis curve, derived from the ratio of OFF resistance to ON resistance (R_OFF/R_ON) at 4 V, yields approximate values of 1.08, 1.33, and 1.57 for ceria nanocubes, ceria nanopolyhedra, and ceria nanorods, respectively. Impedance vs. frequency analysis of the samples was also carried out to study their electrical and transport properties. The results obtained from electrochemical analyses are complimented by electrical studies.

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形状定制纳米铈作为高性能超级电容器电极材料

电化学储能装置预示着一个更加光明的未来，为满足不断增长的全球能源需求提供了高效、可持续的解决方案。目前的工作研究了不同铈纳米结构（纳米棒、纳米立方体和纳米多面体）作为超级电容器应用的有效电极材料的开发和表征。利用各种光谱和非光谱技术对电极材料进行了系统表征。伽马静态充放电、电化学阻抗光谱和循环伏安技术用于评估电极材料的电化学性能。铈纳米棒是上述应用的最佳材料，它在酸性电解质中的最大比电容为 437.27 F/g。纳米铈结构的电流-电压（I-V）特性表现出滞后行为；纳米铈棒显示出记忆性和记忆电容性的共存。在 4 V 电压下，根据关断电阻与导通电阻之比（ROFF/RON）得出的磁滞曲线环面积，纳米陶瓷立方体、纳米陶瓷多面体和纳米陶瓷棒的近似值分别为 1.08、1.33 和 1.57。此外，还对样品进行了阻抗与频率分析，以研究其电气和传输特性。电学研究补充了电化学分析的结果。

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来源期刊

Materialia MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

6.40

自引率

2.90%

发文量

345

审稿时长

36 days

期刊介绍： Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials. Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).