水介质中非热等离子体功能化膨胀石墨用于改进碳基超级电容器

IF 6.9 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
K.D. Mannrich , C.R. Vanoni , A.M. Ferraria , A.M.B. Rego , S. Pessanha , S. Sério , C.L. Jost , N.A. Debacher
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引用次数: 0

摘要

超级电容器是新一代储能技术,具有高性能和不同的作用机制。双电层电容器(EDLC)是一种超级电容器,它可以在具有一定功能化程度的碳材料中制备。疏水碳基材料(如石墨、石墨烯和纳米管)功能化的不同方法之一是非热等离子体技术。功能化是基于等离子体产生的物质与碳表面的相互作用发生的。在水介质中,除了等离子体工作气体的电离物质外,还形成羟基自由基。这些物质可以同时插入到碳晶格中,以相对较低的能耗增加亲水性。在本研究中,将膨胀石墨(EG)暴露于水介质(EGW)和0.1 M硝酸介质(EGN)中的非热等离子体(NTP)中。通过形貌和结构分析对样品进行了表征,随后进行了超级电容器电极应用的电化学表征。Raman分析表明,EGN具有较高的ID/IG和最低的I2D/IG,表明EGN的sp3碳增加,厚度增加。XPS结果表明,EGW的氧含量高于EG,但仍保持了较高的石墨化程度,并且通过循环伏安法可以确定EGW具有更高的比电容,即增加15%。结果表明,等离子体处理在水介质中具有较好的功能化效果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Expanded graphite functionalized by non-thermal plasma in aqueous medium applied to improve carbon-based supercapacitors

Expanded graphite functionalized by non-thermal plasma in aqueous medium applied to improve carbon-based supercapacitors

Expanded graphite functionalized by non-thermal plasma in aqueous medium applied to improve carbon-based supercapacitors
Supercapacitors are the next generation of energy storage, bringing high performance and different mechanisms of action. One of the types of supercapacitors are the electric double layer capacitor (EDLC), which can be obtained in carbon materials with some degree of functionalization. One of the different methods of functionalization of hydrophobic carbon-based materials, such as graphite, graphene and nanotubes, is the non-thermal plasma technique. The functionalization occurs based on the interaction of the species produced by plasma with the carbon surface. In aqueous media, hydroxyl radicals are formed in addition to the ionized species from the plasma working gas. These species can be simultaneously inserted in the carbon lattice increasing hydrophilicity with relatively low energy consumption. In this study, expanded graphite (EG) was exposed to non-thermal plasma (NTP) in aqueous media (EGW) and in a 0.1 M nitric acidic media (EGN). Morphological and structural analyses were performed to characterize the samples and subsequently, electrochemical characterization for supercapacitor electrode application was carried out. The Raman analysis showed that EGW have the higher ID/IG and the lowest I2D/IG showing that there is an increase of sp3 carbon and an increasing thickness as for EGN. The XPS revealed that EGW has more oxygen content than EG, still maintaining a high degree of graphitization, and with the cyclic voltammetry it was possible to determinate that EGW has the higher specific capacitance, namely an increase of 15%. This result shows that the plasma treatment in aqueous medium is the more efficient for functionalization.
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来源期刊
Applied Surface Science
Applied Surface Science 工程技术-材料科学:膜
CiteScore
12.50
自引率
7.50%
发文量
3393
审稿时长
67 days
期刊介绍: Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.
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