3D hollow porous carbon microspheres derived from Mn-MOFs and their electrochemical behavior for sodium storage
3D hollow porous carbon microspheres derived from Mn-MOFs and their electrochemical behavior for sodium storage
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DOI：
10.1039/c7ta08352a
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发表时间：
2017-11
影响因子：
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通讯作者：
Guoqiang Zou;Hongshuai Hou;Xiaoyu Cao;P. Ge;Ganggang Zhao;D. Yin;Xiaobo Ji
中科院分区：
文献类型：
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作者：
Guoqiang Zou;Hongshuai Hou;Xiaoyu Cao;P. Ge;Ganggang Zhao;D. Yin;Xiaobo Ji
人们已经投入了大量的精力来开发具有三维中空多孔球形结构的新材料，以增加其在储能方面的应用。本文首先对三维中空微球Mn-MOFs （3DMn-MOFs）进行炭化和后酸处理，制备了三维中空多孔碳微球（3DHPCMs），其高表面积为788.2 m2 g−1，直径约为2 μm。重要的是，这是第一次通过调节聚乙烯吡咯烷酮（PVP）的量实现从一维纳米棒到三维mn - mof空心球体的转化。此外，还首次研究了三维中空多孔碳微球的储钠行为。当用作钠离子电池（sib）的阳极时，3DHPCMs具有优异的电化学存储性能，在电流密度为100 mA g - 1时具有313.8 mA h g - 1的高比容量。令人印象深刻的是，在5a g−1下获得了112.5 mA h g−1的高放电比容量。优异的电化学性能可归因于三维中空多孔微球结构，它可以增强机械稳定性，缓冲体积膨胀，加速Na+和电子的输运。这项工作为三维空心球形结构材料的发展提供了一条新的途径。
Extensive efforts have been put into developing new materials with a 3D hollow porous spherical structure for increasing their applications in energy storage. In this work, 3D hollow porous carbon microspheres (3DHPCMs) are firstly prepared by the carbonization and post acid-treatment of 3D hollow microspherical Mn-MOFs (3DMn-MOFs), showing a high surface area of 788.2 m2 g−1 and a diameter of about 2 μm. Importantly, this is the first time that the conversion from 1D nanorods to 3D hollow spheres of Mn-MOFs through regulating the amount of poly(vinylpyrrolidone) (PVP) has been realized. Besides, the sodium storage behavior of 3D hollow porous carbon microspheres is also firstly studied. When utilized as anodes for sodium ion batteries (SIBs), the 3DHPCMs deliver excellent electrochemical storage performances with a high specific capacity of 313.8 mA h g−1 at a current density of 100 mA g−1. Impressively, a high discharge specific capacity of 112.5 mA h g−1 is obtained at 5 A g−1. The outstanding electrochemical performances can be attributed to the 3D hollow porous microsphere structure, which can enhance the mechanical stability, buffer the volume expansion, and accelerate the transport of Na+ and electrons. This work provides a new route for the development of materials with a 3D hollow spherical structure.