Pre-Polymerization and Pre-Etching Dominated by Carbon Dots to Fabricate the Sub-Nanometer Microporous Carbon for Supercapacitors.

IF 16.9 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Xi-Rong Zhang,Bao-Juan Wang,Hao-Wen Sun,Yong-Gang Wang,Huan-Ming Xiong
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引用次数: 0

Abstract

The self-templating method is a facile and low-cost strategy to synthesize porous carbon materials, but the obtained products usually have low yields, limited specific surface areas (SSAs), and broad pore size distributions. It is a great challenge for the self-templating method to prepare the sub-nanometer (0.5-1.0 nm) microporous carbon that is preferred for high-performance supercapacitors. In this study, carbon dots (CDs) are employed as the sole precursor to prepare porous carbon without using any activating agents. The obtained carbon materials have large SSA (2733.6 m2 g-1), high micropore area ratio (92.5%), high packing density (0.82 g cm-3), high yield (12%), and concentrated sub-nanometer pore structure. The formation mechanism of such porous carbon and the unique functions of CDs as self-templates are interpreted by various characterizations. When used as electrodes for supercapacitors, this carbon material exhibits specific capacitance up to 639 F g-1 and is compatible with electrolytes of wide pH values and enlarged voltage windows (1.3-1.7 V). The symmetric devices assembled by such material exhibit low self-discharge behaviors, excellent energy densities (15.9-44.1 Wh kg-1), and good cycling performance even under the commercial-level mass loading (10 mg cm-2) on electrodes.
以碳点为主的预聚合和预蚀刻制备超级电容器用亚纳米微孔碳。
自模板法是一种简单、低成本的多孔碳材料合成方法,但所得产品产率低、比表面积有限、孔径分布宽。制备高性能超级电容器首选的亚纳米(0.5-1.0 nm)微孔碳是自模板法面临的巨大挑战。在本研究中,采用碳点(CDs)作为唯一前驱体制备多孔碳,而不使用任何活化剂。所得碳材料具有SSA大(2733.6 m2 g-1)、微孔面积比高(92.5%)、堆积密度高(0.82 g cm-3)、产率高(12%)、亚纳米孔结构集中等特点。通过各种表征来解释这种多孔碳的形成机制和CDs作为自模板的独特功能。当用作超级电容器的电极时,这种碳材料具有高达639 F -1的特定电容,并且与宽pH值和扩大电压窗口(1.3-1.7 V)的电解质兼容。由这种材料组装的对称器件具有低自放电行为,优异的能量密度(15.9-44.1 Wh kg-1),即使在商业水平的质量负载(10 mg cm-2)下也具有良好的循环性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
26.60
自引率
6.60%
发文量
3549
审稿时长
1.5 months
期刊介绍: Angewandte Chemie, a journal of the German Chemical Society (GDCh), maintains a leading position among scholarly journals in general chemistry with an impressive Impact Factor of 16.6 (2022 Journal Citation Reports, Clarivate, 2023). Published weekly in a reader-friendly format, it features new articles almost every day. Established in 1887, Angewandte Chemie is a prominent chemistry journal, offering a dynamic blend of Review-type articles, Highlights, Communications, and Research Articles on a weekly basis, making it unique in the field.
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