Carbon matrix nanostructured composites as a new type of supercapacitor electrode materials

IF 0.8 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Letters on Materials Pub Date : 2023-03-01 DOI:10.22226/2410-3535-2023-1-20-27
Yuri Zakharov, G. Simenyuk, Tatiana Sergina, N. Ivanova, T. Larichev, I. Zykov, Yulia N. Dudnikova
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Abstract

Carbon matrix nanocomposites C / Au and C / Mn x O y are obtained by a reduction of HAuCl 4 and KMnO 4 precursor solutions with single-walled carbon nanotubes or highly porous carbon materials obtained by high-temperature alkaline activation of various metamorphism degree coals. The morphology of the nanocomposite materials is studied by the electron microscopy. It is found that the filler introduction slightly reduces the specific surface of matrices and, due to the blocking of meso-and micropore volumes, filler nanoparticles do not precipitate in the pores of a predominantly microporous matrix and partially decorate them in mixed-type matrices (meso-and micropores). Nanocomposites have been studied as supercapacitor electrode materials. It is established that decorating the matrix surface with both types fillers (Au, which increases the electrical double layer capacitance, and Mn x O y , which is electrochemically active in a given potential window due to the occurrence of Red-O x electrode processes) results in an increase in the supercapacitor electrodes capacitance. The most significant effect is observed for composites based on the SWCNT and highly porous Boghead in the region of high potential scan rates by a factor of 3.4 – 4.5, and in the region of low rates (2.5 – 2.8), depending on the filler. The results obtained allow one to consider the composites C / Au and C / Mn x O y as promising materials for the development of SC electrodes.
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碳基纳米复合材料是一种新型的超级电容器电极材料
碳基纳米复合材料C/Au和C/MnxOy是由HAuCl4和KMnO4前驱体溶液与单壁碳纳米管或通过高温碱性活化不同变质程度的煤而获得的高度多孔碳材料还原而获得的。用电子显微镜研究了纳米复合材料的形貌。研究发现,填料的引入略微降低了基质的比表面积,并且由于中孔和微孔体积的堵塞,填料纳米颗粒不会沉淀在以微孔为主的基质的孔中,并将其部分修饰在混合型基质(中孔和微孔)中。纳米复合材料已被研究作为超级电容器电极材料。已经确定,用两种类型的填料(Au,它增加了双电层电容,MnxOy,它由于Red-Ox电极过程的发生而在给定的电势窗口中具有电化学活性)装饰基体表面会导致超级电容器电极电容的增加。基于SWCNT和高度多孔Boghead的复合材料在高电位扫描速率(3.4–4.5倍)区域和低速率(2.5–2.8)区域观察到最显著的影响,具体取决于填料。所获得的结果允许人们认为C/Au和C/MnxOy复合材料是开发SC电极的有前途的材料。
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来源期刊
Letters on Materials
Letters on Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
1.60
自引率
14.30%
发文量
48
期刊介绍: The aim of "Letters on materials" is to provide a fast publication of short research and review articles on various topics in materials science and related areas of material physics and mechanics. The editorial board sees it''s own task in rapid informing of the readers on the state-of-the-art challenges and achievements in materials science. The editorial board does its best to select high quality papers reporting new scientific results that are of interest for researchers in materials science, physics, and mechanics. "Letters on materials" invites Russian and foreign researches to publish papers in both the Russian and English languages. The scope of the journal covers the following research areas: structure analysis of materials, mechanical and physical properties of materials, production and processing of materials, experimental methods of investigation of materials, theory and computational methods in solid state physics. "Letters on materials" is designed for researchers, engineers, lecturers, and students working in the areas of materials science, mechanical engineering, metal forming, physics, and material mechanics.
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