Asymmetric Supercapacitors Using 3D Nanoporous Carbon and Cobalt Oxide Electrodes Synthesized from a Single Metal-Organic Framework
Asymmetric Supercapacitors Using 3D Nanoporous Carbon and Cobalt Oxide Electrodes Synthesized from a Single Metal-Organic Framework
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DOI：
10.1021/acsnano.5b01790
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发表时间：
2015-06-01
期刊：
影响因子：
17.1
通讯作者：
Yamauchi, Yusuke
中科院分区：
文献类型：
--
作者：
Salunkhe, Rahul R.;Tang, Jing;Yamauchi, Yusuke
通过优化退火条件，从单一金属有机骨架（MOF）（沸石咪唑骨架，ZIF-67）选择性地制备了纳米多孔碳和纳米多孔钴氧化物（Co 3 O 4）材料。所得的ZIF衍生的碳具有高度石墨化的壁和350 m2·g（-1）的高比表面积，而所得的ZIF衍生的纳米多孔Co 3 O 4具有148 m2·g（-1）的高比表面积和少得多的碳含量（1.7at%）。当纳米多孔碳和纳米多孔Co 3 O 4作为超级电容器应用的电极材料进行测试时，它们显示出高电容值（在5 mV.s（-1）的扫描速率下分别为272和504 F.g（-1））。为了进一步证明我们的ZIF衍生的纳米多孔材料的优点，还使用纳米多孔碳和纳米多孔Co 3 O 4电极制造了对称（SSC）和非对称超级电容器（ASC）。AS（（Co 3 O 4/碳）成功地实现了改进的电容性能，优于基于纳米多孔碳和纳米多孔Co 3 O 4材料的SSC的电容性能（即，碳//碳和Co 3 O 4//Co 3 O 4）。所开发的AS（具有最佳质量负载）可以在0.0-1.6 V的宽电势窗口内操作，这导致36 W的高比能量。H. kg（-1）。更有趣的是，这款ASC还具有出色的倍率性能（最高比功率为8000 W。kg-1，比能量为15 W.h.kg（-1）），并具有长达2000次循环的长期稳定性。
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 m(2) g(-1), while the resulting ZIF-derived nanoporous Co3O4 possesses a high specific surface area of 148 m(2).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 AS( (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 AS( 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.