Covalent Graphene-MOF Hybrids for High-Performance Asymmetric SupercapacitorsShow others and affiliations
2021 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 33, no 4, article id 2004560Article in journal (Refereed) Published
Abstract [en]
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-NH2 hybrid displayed a large specific surface area, hierarchical pores and an interconnected conductive network. The electrochemical characterizations demonstrated that the hybrid GA@UiO-66-NH2 acts 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-NH2 positive electrode with Ti3C2TX MXene as the opposing electrode has been constructed. The cell is able to deliver a power density of up to 16 kW kg−1 and an energy density of up to 73 Wh 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. © 2020 The Authors. Advanced Materials published by Wiley-VCH GmbH
Place, publisher, year, edition, pages
Wiley-VCH Verlag , 2021. Vol. 33, no 4, article id 2004560
Keywords [en]
2D materials, asymmetric supercapacitors, covalent assemblies, metal-organic frameworks, MXenes, Amides, Capacitance, Carboxylation, Charge transfer, Electrodes, Hybrid materials, Organic polymers, Organometallics, Supercapacitor, Asymmetric supercapacitor, Conductive networks, Conjugated structures, Covalent attachment, Electrochemical characterizations, Functionalized graphene, Large specific surface areas, Positive electrodes, Graphene
Identifiers
URN: urn:nbn:se:miun:diva-43444DOI: 10.1002/adma.202004560ISI: 000596065400001Scopus ID: 2-s2.0-85097208378OAI: oai:DiVA.org:miun-43444DiVA, id: diva2:1604033
Note
2021-10-182021-10-182021-10-18Bibliographically approved