Synergistically enhanced electrochemical performance using N-rich multilayered carbon nanofibers

IF 4.5 3区 化学 Q1 Chemical Engineering
Dongil Kim , Hee-Jo Lee , Bo-Hye Kim
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Abstract

N-rich multilayered carbon nanofibers with hollow channels (PPMPN) are fabricated to fully utilize the mesopores, micropores, and nitrogen-functional groups of carbon nanofibers (CNFs) for superior electrochemical properties. Among all composites, the PPMPN(10) exhibits high specific surface area (570 m2g−1) with mesopore volume fraction (42%) and rich surface functionalities (∼7.25at% nitrogen and ∼ 16.1at% oxygen), helping to improve electrochemical performance. The performance of the symmetric supercapacitor of the PPMPN was significantly improved in terms of its specific capacitance of 189 Fg−1 at 1 mAcm−2, good retention of 80% (when the current density is increased from 1 to 20 mAcm−2), energy density of 23.5 Whkg−1 at a power density of 400 Wkg−1, and cycling stability of 94% for 10,000 cycles. The top layer plays a role in charge storage/transport by increasing electrical conductivity due to N-functional groups. The intermediate layer with tubular 1D nanostructures enhances the diffusion of electrolyte ions even at higher current densities. The bottom layer composed of numerous micropores serves as a charge storage layer. Therefore, in the multilayer CNF, the micropores/mesopores and N-functional properties of each layer do not interfere with each other, and the advantages of the factors of each layer are maximized in the electrochemical properties.

Abstract Image

富氮多层碳纳米纤维协同增强电化学性能
摘要为了充分利用纳米碳纤维的介孔、微孔和氮官能团的特性,制备了具有中空通道的富氮多层纳米碳纤维(PPMPN)。在所有复合材料中,PPMPN(10)具有较高的比表面积(570 m2g−1),介孔体积分数(42%)和丰富的表面功能(约7.25at%氮和约16.1at%氧),有助于提高电化学性能。在1 mAcm−2时,对称超级电容器的比电容为189 Fg−1,当电流密度从1增加到20 mAcm−2时,保持率为80%,功率密度为400 Wkg−1时,能量密度为23.5 Whkg−1,循环稳定性为94%。顶层通过n官能团增加电导率来发挥电荷存储/传输的作用。具有管状一维纳米结构的中间层即使在较高的电流密度下也能增强电解质离子的扩散。由众多微孔组成的底层作为电荷存储层。因此,在多层CNF中,每层的微孔/介孔和n -功能性能不相互干扰,各层因素的优势在电化学性能上得到最大化。
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来源期刊
Journal of Electroanalytical Chemistry
Journal of Electroanalytical Chemistry Chemical Engineering-General Chemical Engineering
CiteScore
7.50
自引率
6.70%
发文量
912
审稿时长
>12 weeks
期刊介绍: The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.
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