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Layered Double Hydroxide Hollowcages with Adjustable Layer Spacing for High Performance Hybrid Supercapacitor
Small ( IF 13.0 ) Pub Date : 2021-10-27 , DOI: 10.1002/smll.202104423 Jiamin Ma 1 , Jiale Xia 2 , Zhong Liang 1 , Xiaoyun Chen 1 , Yaping Du 1 , Chun-Hua Yan 3, 4
Small ( IF 13.0 ) Pub Date : 2021-10-27 , DOI: 10.1002/smll.202104423 Jiamin Ma 1 , Jiale Xia 2 , Zhong Liang 1 , Xiaoyun Chen 1 , Yaping Du 1 , Chun-Hua Yan 3, 4
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Layered double hydroxides (LDHs) have been considered as promising electrodes for supercapacitors due to their adjustable composition, designable function and superior high theoretic capacity. However, their experimental specific capacity is significantly lower than the theoretical value due to their small interlayer spacing. Therefore, obtaining large interlayer spacing through the intercalation of large-sized anions is an important means to improve capacity performance. Herein, a metal organic framework derived cobalt-nickel layered double hydroxide hollowcage intercalated with different concentrations of 1,4-benzenedicarboxylic acid (H2BDC) through in-situ cationic etching and organic ligand intercalation method is designed and fabricated. The superior specific capacity and excellent rate performance are benefit from the large specific surface area of the hollow structure and increasing interlayer spacing of LDH after H2BDC intercalation. The sample with the largest layer spacing displays a maximum specific capacity of 229 mA h g−1 at 1 A g−1. In addition, the hybrid supercapacitor assembled from the sample with the largest layer spacing and active carbon electrode has a maximum specific capacity of 158 mA h g−1 at 1 A g−1; the energy density is as high as 126.4 W h kg−1 at 800 W kg−1 and good cycle stability.
中文翻译：
用于高性能混合超级电容器的具有可调层间距的分层双氢氧化物空心笼
层状双氢氧化物（LDHs）由于其成分可调、功能可设计和优异的高理论容量而被认为是超级电容器的有前途的电极。然而，由于它们的层间距小，它们的实验比容量明显低于理论值。因此，通过大尺寸阴离子的插层获得大的层间距是提高容量性能的重要手段。在此，金属有机骨架衍生的钴镍层状双氢氧化物空心笼插入不同浓度的 1,4-苯二甲酸（H 2BDC) 通过原位阳离子蚀刻和有机配体嵌入方法设计和制造。优异的比容量和优异的倍率性能得益于中空结构的大比表面积和H 2 BDC 插层后LDH 的层间距增大。具有最大层间距的样品在1 A g -1 时显示出229 mA hg -1的最大比容量。此外，该混合超级电容器从具有最大层间距和活性碳电极样品组装具有158毫安Hg的最大比容量-1 1 A G -1 ; 能量密度高达126.4 W时千克-1在800瓦特千克-1 和良好的循环稳定性。
更新日期：2021-12-09
中文翻译：
用于高性能混合超级电容器的具有可调层间距的分层双氢氧化物空心笼
层状双氢氧化物（LDHs）由于其成分可调、功能可设计和优异的高理论容量而被认为是超级电容器的有前途的电极。然而，由于它们的层间距小，它们的实验比容量明显低于理论值。因此，通过大尺寸阴离子的插层获得大的层间距是提高容量性能的重要手段。在此，金属有机骨架衍生的钴镍层状双氢氧化物空心笼插入不同浓度的 1,4-苯二甲酸（H 2BDC) 通过原位阳离子蚀刻和有机配体嵌入方法设计和制造。优异的比容量和优异的倍率性能得益于中空结构的大比表面积和H 2 BDC 插层后LDH 的层间距增大。具有最大层间距的样品在1 A g -1 时显示出229 mA hg -1的最大比容量。此外，该混合超级电容器从具有最大层间距和活性碳电极样品组装具有158毫安Hg的最大比容量-1 1 A G -1 ; 能量密度高达126.4 W时千克-1在800瓦特千克-1 和良好的循环稳定性。
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