An Asymmetric Supercapacitor Based on a Non-Calcined 3D Pillared Cobalt(II) Metal-Organic Framework with Long Cyclic Stability
An Asymmetric Supercapacitor Based on a Non-Calcined 3D Pillared Cobalt(II) Metal-Organic Framework with Long Cyclic Stability
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DOI：
10.1021/acs.inorgchem.9b02658
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发表时间：
2019-12-02
影响因子：
4.6
通讯作者：
Wang, Jun
中科院分区：
文献类型：
--
作者：
Sanati, Soheila;Abazari, Reza;Wang, Jun
在本工作中，合成了一种新的三维金属有机骨架(MOF){[Co-3(MU(4)-TPA)(3)(MU-DAPZ)(DMF)(2)]中心点2DMF}(N)(Co(II)-TMU-63；H(2)TPA=对苯二甲酸，DAPZ=吡嗪-2，5-二胺，DMF=二甲基甲酰胺)，并对其进行了全面表征，并将其用作超级电容器的电极材料。因此，这种材料的合成代表了能源领域一种经济和成本效益高的方法。Co(II)-TMU-63的晶体结构是由两种有机构筑块(Mu(4)-TPA(2-)和Mu-DAPZ配体)组装而成的，它们将钴节点排列成具有未见报道的4，4，4，6T14拓扑的复杂的层柱网络。这种MOF中开放中心的存在对于研究电化学活性和其他类型的应用是有希望的。事实上，Co(II)-TMU-63作为一种新型的电极材料，与原始的MOF相比，表现出很好的循环稳定性、大容量和高能量密度，因此是一种性能优异的超级电容器(6Ag(-1)下的384 Fg(-1))。此外，在12Ag(-1)的电流密度下，6000次循环后的循环性能稳定(容量为90%)。Co(II)-TMU-63//活性碳(AC)不对称超级电容器在1.7V(0-1.7V)的宽电位窗口内工作，表现出4.42kW kg(-1)功率密度(Pd)和24.13Wh(-1)能量密度(ED)的高性能。这些结果表明，原始MOF在改进不同的高性能电化学储能装置方面具有巨大的潜力，而不需要热解或焙烧阶段。因此，这种材料对未来能源领域的发展非常有希望。
In this work, a new 3D metal-organic framework (MOF) {[Co-3(mu(4)-tpa)(3)(mu-dapz)(DMF)(2)]center dot 2DMF}(n) (Co(II)-TMU-63; H(2)tpa = terephthalic acid, dapz = pyrazine-2,5-diamine, DMF = dimethylformamide) containing low-cost and readily available ligands was generated, fully characterized, and used as an electrode material in supercapacitors without the need for a calcination process. Thus, the synthesis of this material represents an economical and cost-effective method in the energy field. The crystal structure of Co(II)-TMU-63 is assembled from two types of organic building blocks (mu(4)-tpa(2-) and mu-dapz ligands), which arrange the cobalt nodes into a complex layer-pillared net with an unreported 4,4,4,6T14 topology. The presence of open sites in this MOF is promising for studying electrochemical activity and other types of applications. In fact, Co(II)-TMU-63 as a novel electrode material when comparing with pristine MOFs shows great cycling stability, large capacity, and high energy density and so acts as an excellent supercapacitor (384 F g(-1) at 6 A g(-1)). In addition, there was a stable cycling performance (90% capacitance) following 6000 cycles at 12 A g(-1) current density. Also, the Co(II)-TMU-63//activated carbon (AC) asymmetric supercapacitor acted in a broad potential window of 1.7 V (0-1.7 V), exhibiting a high performance with 4.42 kW kg(-1) power density (PD) and 24.13 Wh kg(-1) energy density (ED). These results show that the pristine MOFs have great potential toward improving different high-performance electrochemical energy storage devices, without requiring the pyrolysis or calcination stages. Hence, such materials are very promising for future advancement of the energy field.