Synthesis of Co3O4/Carbon Heteroaerogels with Ultrahigh Capacitance via Polyethyleneimine Intercalation of Co2BIM4 Nanosheets
Synthesis of Co3O4/Carbon Heteroaerogels with Ultrahigh Capacitance via Polyethyleneimine Intercalation of Co2BIM4 Nanosheets
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通过聚乙烯亚胺插层 Co2BIM4 纳米片合成具有超高电容的 Co3O4/碳杂气凝胶
DOI：
10.1002/chem.202004935
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Huang Aisheng
中科院分区：
文献类型：
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作者：
Liu Chuanyao;Yue Wenzhe;Li Yanhong;Huang Aisheng
基于金属有机骨架(MOF)的超级电容器因其规则排列的孔洞和可调的孔径，近年来引起了人们的极大关注。然而，MOF衍生的超级电容器的性能也很低，因为它们的导电性很差，很难接触到活性中心。在本工作中，我们开发了一种Co-MOF(即Co2BIM4，BIM=苯并咪唑)纳米片状Co3O4/氮掺杂碳(Co2BIM4-Co3O4/NC)异质气凝胶，作为一种新型的超级电容器电极。通过将聚乙烯亚胺(PEI)直接插层到Co2BIM4纳米片层间，然后对所得Co2BIM4/PEI复合材料进行碳化处理，得到了3D Co2BIM4-Co3O4/NC气凝胶。Co2BIM4-Co3O4/NC电极具有3D导电骨架，具有重叠的异质界面和扩展的中间层，导致快速稳定的电荷转移/扩散和增强的伪电容性能。因此，Co2BIM4-Co3O4/NC电极在1 A g−1、1747 F g−1、10 A g−1下的超高容量分别达到2568 F g−1和1747 F g−1，并且在10 A g−1下经过10000 循环后容量保持率达到92.7 %，在超级电容器和其他储能器件中具有很好的应用前景。
The development of metal–organic frameworks (MOFs)‐based supercapacitors have attracted intense concentration in recent years due to their regularly arranged porous and tunable pore sizes. However, the performance of the MOFs‐derived supercapacitors is also low because of their poor electrical conductivity and rarely accessible active sites. In the present work, we developed a Co‐MOF (namely Co2BIM4, BIM=benzimidazole) nanosheets derived Co3O4/nitrogen‐doped carbon (Co2BIM4‐Co3O4/NC) heteroaerogel as a novel supercapacitor electrode. The 3D Co2BIM4‐Co3O4/NC heteroaerogels were obtained by directly intercalating polyethyleneimine (PEI) into the interlayers of Co2BIM4nanosheets and following by carbonizing the resulting Co2BIM4/PEI composite. The Co2BIM4‐Co3O4/NC electrode possessed 3D conductive framework with an overlapped hetero‐interface and expanded interlayers, leading to fast and stable charge transfer/diffusion and an enhanced pseudocapacitance performance. Therefore, the Co2BIM4‐Co3O4/NC electrode showed ultrahigh capacitance of 2568 F g−1at 1 A g−1, 1747 F g−1at 10 A g−1, and excellent long cycling time with a capacitance preservation of 92.7 % following 10000 cycles at 10 A g−1, which is very promising for applications in supercapacitors and other energy storage devices.