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在使用3D纳米多孔碳和氧化钴电极的非对称超级电容器中，这些电极是从单金属有机框架合成的

Asymmetric Supercapacitors Using 3D Nanoporous Carbon and Cobalt Oxide Electrodes Synthesized from a Single Metal–Organic Framework

作者：Rahul R. Salunkhe;Jing Tang;Yuichiro Kamachi;Teruyuki Nakato;Jung Ho Kim;Yusuke Yamauchi;

关键词：nanoporous materials,coordination polymers,metal−organic frameworks,cobalt oxide,carbon,supercapacitors

DOI：https://doi.org/10.1021/acsnano.5b01790

发表时间：2015年

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摘要

从单种金属有机框架（MOF）（沸石咪唑框架，ZIF-67）中，通过优化退火条件，选择性地制备了纳米多孔碳和纳米多孔氧化钴（Co3O4）材料。所得的ZIF衍生碳具有高度石墨化的壁和高比表面积（350m2·g–1），而ZIF衍生的纳米多孔Co3O4具有较高的比表面积（148m2·g–1），碳含量较低（1.7%）。当纳米多孔碳和纳米多孔Co3O4作为超级电容器应用的电极材料进行测试时，它们表现出较高的电容值（分别为272和504 F·g–1，扫描速率为5mV·s–1）。为了进一步证明我们的ZIF衍生纳米多孔材料的优势，还使用纳米多孔碳和纳米多孔Co3O4电极制备了对称（SSCs）和不对称超级电容器（ASCs）。改进的电容性能成功地实现在ASC（Co3O4//碳）中，比基于纳米多孔碳和纳米多孔Co3O4材料的SSC（即，碳//碳和Co3O4//Co3O4）更好。经过优化的质量装载的ASC可以在0.0-1.6V的宽电位窗口内工作，这导致高比能量为36W·h·kg–1。更有趣的是，这个ASC还表现出优秀的速率能力（在15W·h·kg–1的比能量下，具有最高特定功率为8000W·kg–1），并具有长期稳定性，可达2000周期。


Abstract

Nanoporous carbon and nanoporous cobalt oxide (Co3O4) materials have been selectively prepared from a single metal–organic framework (MOF) (zeolitic imidazolate framework, ZIF-67) by optimizing the annealing conditions. The resulting ZIF-derived carbon possesses highly graphitic walls and a high specific surface area of 350 m2·g–1, while the resulting ZIF-derived nanoporous Co3O4 possesses a high specific surface area of 148 m2·g–1 with much less carbon content (1.7 at%). When nanoporous carbon and nanoporous Co3O4 were tested as electrode materials for supercapacitor application, they showed high capacitance values (272 and 504 F·g–1, respectively, at a scan rate of 5 mV·s–1). To further demonstrate the advantages of our ZIF-derived nanoporous materials, symmetric (SSCs) and asymmetric supercapacitors (ASCs) were also fabricated using nanoporous carbon and nanoporous Co3O4 electrodes. Improved capacitance performance was successfully realized for the ASC (Co3O4//carbon), better than those of the SSCs based on nanoporous carbon and nanoporous Co3O4 materials (i.e., carbon//carbon and Co3O4//Co3O4). The developed ASC with an optimal mass loading can be operated within a wide potential window of 0.0–1.6 V, which leads to a high specific energy of 36 W·h·kg–1. More interestingly, this ASC also exhibits excellent rate capability (with the highest specific power of 8000 W·kg–1 at a specific energy of 15 W·h·kg–1) combined with long-term stability up to 2000 cycles.


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