Boosting the Electrical Double-Layer Capacitance of Graphene by Self-Doped Defects through Ball-Milling

IF 18.5 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Yue Dong, Su Zhang, Xian Du, Song Hong, Shengna Zhao, Yaxin Chen, Xiaohong Chen, Huaihe Song
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引用次数: 199

Abstract

Improving the capacitance of carbon materials for supercapacitors without sacrificing their rate performance, especially volumetric capacitance at high mass loadings, is a big challenge because of the limited assessable surface area and sluggish electrochemical kinetics of the pseudocapacitive reactions. Here, it is demonstrated that “self-doping” defects in carbon materials can contribute to additional capacitance with an electrical double-layer behavior, thus promoting a significant increase in the specific capacitance. As an exemplification, a novel defect-enriched graphene block with a low specific surface area of 29.7 m2 g−1 and high packing density of 0.917 g cm−3 performs high gravimetric, volumetric, and areal capacitances of 235 F g−1, 215 F cm−3, and 3.95 F cm−2 (mass loading of 22 mg cm−2) at 1 A g−1, respectively, as well as outstanding rate performance. The resulting specific areal capacitance reaches an ultrahigh value of 7.91 F m−2 including a “self-doping” defect contribution of 4.81 F m−2, which is dramatically higher than the theoretical capacitance of graphene (0.21 F m−2) and most of the reported carbon-based materials. Therefore, the defect engineering route broadens the avenue to further improve the capacitive performance of carbon materials, especially for compact energy storage under limited surface areas.

Abstract Image

自掺杂缺陷球磨增强石墨烯双层电容量
提高超级电容器用碳材料的电容而不牺牲其速率性能,特别是在高质量负载下的体积电容,是一个很大的挑战,因为假电容反应的可评估表面积有限,电化学动力学缓慢。本研究证明,碳材料中的“自掺杂”缺陷可以产生具有电双层行为的额外电容,从而促进比电容的显着增加。例如,一种新型缺陷富集石墨烯块具有29.7 m2 g−1的低比表面积和0.917 g cm−3的高堆积密度,在1 a g−1下分别具有235 F g−1、215 F cm−3和3.95 F cm−2(质量负载为22 mg cm−2)的高重量、体积和面积电容,以及出色的速率性能。所得到的比面积电容达到7.91 F m−2的超高值,其中“自掺杂”缺陷贡献为4.81 F m−2,这大大高于石墨烯(0.21 F m−2)和大多数报道的碳基材料的理论电容。因此,缺陷工程路线拓宽了进一步提高碳材料电容性能的途径,特别是在有限表面积下的紧凑型储能。
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来源期刊
Advanced Functional Materials
Advanced Functional Materials 工程技术-材料科学:综合
CiteScore
29.50
自引率
4.20%
发文量
2086
审稿时长
2.1 months
期刊介绍: Firmly established as a top-tier materials science journal, Advanced Functional Materials reports breakthrough research in all aspects of materials science, including nanotechnology, chemistry, physics, and biology every week. Advanced Functional Materials is known for its rapid and fair peer review, quality content, and high impact, making it the first choice of the international materials science community.
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