Self-assembly of carbon nanotubes on a hollow carbon polyhedron to enhance the potassium storage cycling stability of metal organic framework-derived metallic selenide anodes
| Autor: | Juncheng Hu, Hai Jian Yang, Lin Wang, Zhengxi Huang, Tengfei Zhou, Yifan Sun, Kun Yang, Qingqing Jiang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
chemistry.chemical_element Nanoparticle 02 engineering and technology Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Redox 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Anode law.invention Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry chemistry Chemical engineering law Selenide Metal-organic framework Self-assembly 0210 nano-technology Carbon |
| Zdroj: | Journal of Colloid and Interface Science. 601:60-69 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2021.05.064 |
| Popis: | Potassium-ion batteries (PIBs) is increasingly studied because of their suitable redox potential and high natural abundance. However, potential anode materials with long-term cycling stability are still in high demand because of the large radius of K+. Herein, an MOF-derived hierarchical carbon structure and the self-assembly of CNTs on hollow carbon polyhedrons are used as carbon matrices to disperse and stabilize metal selenides(Co-Se@CNNCP). When the hybrid is utilized in PIBs, it displays a specific capacity of 410 mA h g−1 at 0.1 A g−1 after 80 cycles and 253 mA h g−1 at 0.5 A g−1 after 200 cycles with a capacity retention of 100%, while the metal selenides dispersed on hollow carbon polyhedrons without CNTs (Zn-Co-Se@NCP) lose 86% of their capacity after 200 cycles. The superior cycling stability of the hybrid is mainly attributed to the large amounts of CNTs suppressing the agglomeration of the metal selenide nanoparticles on the surface, and the hollow carbon polyhedrons cause a high structural integrity during the repreated K+ insertion and extraction process. This work offers a feasible route to design a hierarchical carbon matrix for use as the anode materials of PIBs with long-term cycling stability. |
| Databáze: | OpenAIRE |
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