Metal Organic Framework Derived Porous Hollow Co3O4/N-C Polyhedron Composite with Excellent Energy Storage Capability
Metal Organic Framework Derived Porous Hollow Co3O4/N-C Polyhedron Composite with Excellent Energy Storage Capability
复制标题
具有优异储能能力的金属有机框架衍生多孔空心Co3O4/N-C多面体复合材料
DOI：
10.1021/acsami.6b15000
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发表时间：
2017-03-29
影响因子：
9.5
通讯作者：
Sun, Daofeng
中科院分区：
文献类型：
--
作者：
Kang, Wenpei;Zhang, Yu;Sun, Daofeng
金属有机骨架（MOFs）衍生的过渡金属氧化物在能量转换和储存方面表现出增强的性能。本文以钴基金属氧化物微结构为牺牲模板，制备了具有N掺杂碳包覆的多孔空心Co 3 O 4（Co 3 O 4/N-C）多面体。Co 3 O 4/N-C复合材料由纳米微粒和N掺杂碳包覆而成，缩短了Li+/Na+离子的扩散距离，提高了电导率。多孔和中空结构也有利于作为锂/钠电池阳极材料耐受恒电流放电/充电循环中的体积变化。因此，它可以表现出令人印象深刻的循环和评级性能。在1000 mA g（-1）下，作为锂离子电池负极，2000次循环后比容量稳定在620 mAh g（-1）左右，而作为钠离子电池负极，150次循环后比容量稳定在229 mAh g（-1）左右。我们的工作显示了在锂离子电池中相当的循环性能，但作为钠离子电池阳极的高倍率循环稳定性甚至更好。在此，我们提供了一种简便的方法，以新的MOFs为牺牲模板构建高电化学性能的氧化物/N-C复合电极。
Metal organic frameworks (MOFs) derived transition metal oxides exhibit enhanced performance in energy conversion and storage. In this work, porous hollow Co3O4 with N-doped carbon coating (Co3O4/N-C) polyhedrons have been prepared using cobalt based MOFs as a sacrificial template. Assembled from tiny nano particles and N-doped carbon coating, Co3O4/N-C composite shortens the diffusion length of Li+/Na+ ions and possesses an enhanced conductivity. And the porous and hollow structure is also beneficial for tolerating volume changes in the galvanostatic discharge/charge cycles as lithium/sodium battery anode materials. As a result, it can exhibit impressive cycling and rating performance. At 1000 mA g(-1) the specific capacities maintaine stable values of similar to 620 mAh g(-1) within 2000 cycles as anodes in lithium ion battery, while the specific capacity keeps at 229 mAh g(-1) within 150 cycles as sodium ion battery anode. Our work shows comparable cycling performance in lithium ion battery but even better high-rate cycling stability as sodium ion battery anode. Herein, we provide a facile method to construct high electrochemical performance oxide/N-C composite electrode using new MOFs as sacrificial template.