Trigonal selenium nanocrystallites decorated cellulose-polyaniline composite as a potential supercapacitor electrode material

IF 8.1 2区 工程技术 Q1 CHEMISTRY, PHYSICAL
Kuttappan Anupama , Merin Tomy , T.S. Xavier , K. A. Ann Mary
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Abstract

Despite the pseudocapacitive nature of polyaniline electrode materials, low power density and poor cyclic stability make them undesirable for efficient supercapacitor applications. Herein, trigonal selenium nanocrystallites decorated cellulose/polyaniline composites are prepared through freeze-drying-assisted room temperature polymerization. All Se/cellulose/PANI composites have similar interconnected fibrillar morphology, which facilitates effective conduction of electrons. Se improves the thermal stability of Se-cellulose-PANI by crystallizing in a trigonal form with crystallites that range in size from 4 to 6 nm. While the presence of Se nanocrystallites offers many ion-accessible active areas and short diffusion paths, cellulose provides outstanding cyclic stability to the material. Among the composites studied, the Se-cellulose-PANI composite demonstrates a noticeable areal capacitance and specific capacitance of 4.55 F/cm2 and 238.33 F/g at a sweep rate of 2 mV/s. Furthermore, it exhibits remarkable cyclic stability as it retains 100 % of initial capacitance even after 5000 cycles of charge-discharge. Additionally, the symmetric supercapacitors assembled with Se-cellulose-PANI composites have a high energy density of 0.087 mWh/cm2 and a power density of 10 mW/cm2. Even after 50,000 cycles, the supercapacitor has an excellent capacitance retention value of 99 %. The outcome supports the indefectible potential of the Se-cellulose-PANI composite and favours the development of efficient solid-state energy storage devices.

Abstract Image

三角形硒纳米晶修饰纤维素-聚苯胺复合材料作为一种潜在的超级电容器电极材料
尽管聚苯胺电极材料具有假电容性,但低功率密度和较差的循环稳定性使其不适合高效的超级电容器应用。本文通过冷冻干燥辅助室温聚合制备了三角形硒纳米晶修饰纤维素/聚苯胺复合材料。所有Se/纤维素/聚苯胺复合材料都具有相似的相互连接的纤维形态,这有利于电子的有效传导。Se通过与尺寸为4 ~ 6nm的晶体形成三角形结晶,提高了Se-cellulose- pani的热稳定性。虽然硒纳米晶的存在提供了许多离子可接近的活性区域和短的扩散路径,但纤维素为材料提供了出色的循环稳定性。在所研究的复合材料中,Se-cellulose-PANI复合材料在2 mV/s的扫描速率下具有显著的面积电容和比电容,分别为4.55 F/cm2和238.33 F/g。此外,它表现出显著的循环稳定性,因为即使在5000次充放电循环后,它也能保持100%的初始电容。此外,用Se-cellulose-PANI复合材料组装的对称超级电容器具有0.087 mWh/cm2的高能量密度和10 mW/cm2的功率密度。即使在5万次循环后,超级电容器仍具有99%的优异电容保持值。该结果支持了Se-cellulose-PANI复合材料的不可救药的潜力,并有利于开发高效的固态储能装置。
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来源期刊
Journal of Power Sources
Journal of Power Sources 工程技术-电化学
CiteScore
16.40
自引率
6.50%
发文量
1249
审稿时长
36 days
期刊介绍: The Journal of Power Sources is a publication catering to researchers and technologists interested in various aspects of the science, technology, and applications of electrochemical power sources. It covers original research and reviews on primary and secondary batteries, fuel cells, supercapacitors, and photo-electrochemical cells. Topics considered include the research, development and applications of nanomaterials and novel componentry for these devices. Examples of applications of these electrochemical power sources include: • Portable electronics • Electric and Hybrid Electric Vehicles • Uninterruptible Power Supply (UPS) systems • Storage of renewable energy • Satellites and deep space probes • Boats and ships, drones and aircrafts • Wearable energy storage systems
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