Covalent Graphene-MOF Hybrids for High-Performance Asymmetric Supercapacitors
| Autor: | Haneesh Saini, Nunzio Motta, Vitalie Stavila, Martin Petr, Aristides Bakandritsos, Michal Otyepka, Štěpán Kment, Deepak P. Dubal, Roland A. Fischer, Chandrabhas Narayana, Michael Horn, Błażej Scheibe, Kolleboyina Jayaramulu, Václav Ranc, Radek Zbořil, Andreas Schneemann |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
covalent assemblies 02 engineering and technology 010402 general chemistry 7. Clean energy 01 natural sciences Capacitance Effective nuclear charge MXenes law.invention asymmetric supercapacitors law General Materials Science metal-organic frameworks Supercapacitor Graphene Mechanical Engineering metal-organic framework 2D materials 021001 nanoscience & nanotechnology ddc 0104 chemical sciences Chemical engineering Mechanics of Materials Covalent bond Electrode Metal-organic framework 0210 nano-technology |
| Zdroj: | Advanced Materials |
| ISSN: | 1521-4095 |
| Popis: | In this work, the covalent attachment of an amine functionalized metal‐organic framework (UiO‐66‐NH2= Zr6O4(OH)4(bdc‐NH2)6; bdc‐NH2= 2‐amino‐1,4‐benzenedicarboxylate) (UiO‐Universitetet i Oslo) to the basal‐plane of carboxylate functionalized graphene (graphene acid = GA) via amide bonds is reported. The resultant GA@UiO‐66‐NH2hybrid displayed a large specific surface area, hierarchical pores and an interconnected conductive network. The electrochemical characterizations demonstrated that the hybrid GA@UiO‐66‐NH2acts as an effective charge storing material with a capacitance of up to 651 F g−1, significantly higher than traditional graphene‐based materials. The results suggest that the amide linkage plays a key role in the formation of a π‐conjugated structure, which facilitates charge transfer and consequently offers good capacitance and cycling stability. Furthermore, to realize the practical feasibility, an asymmetric supercapacitor using a GA@UiO‐66‐NH2positive electrode with Ti3C2TXMXene as the opposing electrode has been constructed. The cell is able to deliver a power density of up to 16kW kg−1and an energy density of up to 73Wh kg−1, which are comparable to several commercial devices such as Pb‐acid and Ni/MH batteries. Under an intermediate level of loading, the device retained 88% of its initial capacitance after 10 000 cycles. |
| Databáze: | OpenAIRE |
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