High-performance flexible supercapacitors based on nitrogen-doped carbon nanotubes derived from ZIFs at low temperature

IF 4.6 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2026-05-01 Epub Date: 2026-02-03 DOI:10.1016/j.jelechem.2026.119912

Jiaxin Yang, Tian Lv, Keyi Dong, Weiyang Tang, Quanhu Sun, Zefeng Yan, Yan Tan, Yu Wang, Tao Chen

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引用次数: 0

Abstract

Nitrogen-doped carbon nanotubes (NCNTs) have attracted considerable interest as promising electrode materials for supercapacitors (SCs) due to their exceptional electrical conductivity, robust mechanical properties, and readily tunable surface chemistry, but often suffer from their limited specific surface area and a scarcity of electrochemically active sites. In this work, we present a novel approach to synthesize NCNTs via pyrolysis of zeolitic imidazolate frameworks (ZIFs) at a low temperature of 500 °C for high-performance flexible SCs. The synthesized NCNTs exhibit a hierarchical porous architecture with high nitrogen content (12.22%), which contributes to enhanced pseudocapacitive performance. Using the NCNTs as the electrode and a polyvinyl alcohol /LiCl gel as electrolyte, the developed SC exhibits a high specific capacitance of 411 mF cm⁻² at a current density of 0.5 mA cm⁻² and excellent cyclic stability up to 90% of its original capacitance after 25,000 charge/discharge cycles. Furthermore, the SCs can well maintain their performance under various bending angles and repeated bending cycles, suggesting excellent flexibility.

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基于氮掺杂碳纳米管的低温柔性超级电容器

氮掺杂碳纳米管（NCNTs）由于其优异的导电性、强大的机械性能和易于调节的表面化学特性，作为超级电容器（SCs）的极具前景的电极材料，引起了人们的极大兴趣，但通常受到其有限的比表面积和电化学活性位点的缺乏的影响。在这项工作中，我们提出了一种在500°C低温下通过沸石咪唑酸框架（ZIFs）热解合成NCNTs的新方法。合成的NCNTs具有高氮含量（12.22%）的分层多孔结构，这有助于增强假电容性能。使用NCNTs作为电极，聚乙烯醇/LiCl凝胶作为电解质，开发的SC在0.5 mA cm - 2电流密度下具有411 mF cm - 2的高比电容，并且在25,000次充放电循环后具有优异的循环稳定性，可达到原始电容的90%。此外，在各种弯曲角度和重复弯曲循环下，碳纤维都能很好地保持其性能，具有良好的柔韧性。

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

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

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.