Green Fabrication of Ultrathin Co3O4 Nanosheets from Metal-Organic Framework for Robust High-Rate Supercapacitors.
Green Fabrication of Ultrathin Co3O4 Nanosheets from Metal-Organic Framework for Robust High-Rate Supercapacitors.
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DOI：
10.1021/acsami.7b10309
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发表时间：
2017-11
影响因子：
9.5
通讯作者：
Zhenyu Xiao;Lili Fan;Ben Xu;Shanqing Zhang;Wenpei Kang;Zixi Kang;Huan Lin;Xiuping Liu;Shenmin Zhan
中科院分区：
文献类型：
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作者：
Zhenyu Xiao;Lili Fan;Ben Xu;Shanqing Zhang;Wenpei Kang;Zixi Kang;Huan Lin;Xiuping Liu;Shenmin Zhan
二维氧化钴 (Co3O4) 是具有高性能的坚固电化学电容器的有希望的候选者。在此，我们使用2,3,5,6-四甲基-1,4-二间苯二甲酸酯作为可回收配体构建UPC-9的Co基金属有机骨架，随后通过水解和煅烧过程获得厚度为3.5 nm的超薄分级Co3O4六方纳米片。所制备的非对称超级电容器在1 A·g-1的电流密度下实现了1121 F·g-1的比电容，在25 A·g-1的电流密度下实现了873 F·g-1的显着且优异的比电容，这可归因于超薄Co3O4纳米片的超薄二维形貌和丰富的大孔和介孔结构。这种合成策略对环境无害且经济可行，因为昂贵的有机配体分子被回收利用，降低了合成过程的材料成本和环境成本。
Two-dimensional cobalt oxide (Co3O4) is a promising candidate for robust electrochemical capacitors with high performance. Herein, we use 2,3,5,6-tetramethyl-1,4-diisophthalate as a recyclable ligand to construct a Co-based metal-organic framework of UPC-9, and subsequently, we obtain ultrathin hierarchical Co3O4 hexagonal nanosheets with a thickness of 3.5 nm through a hydrolysis and calcination process. A remarkable and excellent specific capacitance of 1121 F·g-1 at a current density of 1 A·g-1 and 873 F·g-1 at a current density of 25 A·g-1 were achieved for the as-prepared asymmetric supercapacitor, which can be attributed to the ultrathin 2D morphology and the rich macroporous and mesoporous structures of the ultrathin Co3O4 nanosheets. This synthesis strategy is environmentally benign and economically viable due to the fact that the costly organic ligand molecules are recycled, reducing the materials cost as well as the environmental cost for the synthesis process.