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Type: Journal article
Title: Covalent graphene-MOF hybrids for high-performance asymmetric supercapacitors
Author: Jayaramulu, K.
Horn, M.
Schneemann, A.
Saini, H.
Bakandritsos, A.
Ranc, V.
Petr, M.
Stavila, V.
Narayana, C.
Scheibe, B.
Kment, Š.
Otyepka, M.
Motta, N.
Dubal, D.
Zbořil, R.
Fischer, R.A.
Citation: Advanced Materials, 2020; 33(4):2004560-2004560
Publisher: Wiley
Issue Date: 2020
ISSN: 0935-9648
Statement of
Kolleboyina Jayaramulu, Michael Horn, Andreas Schneemann, Haneesh Saini, Aristides Bakandritsos, Vaclav Ranc, Martin Petr, Vitalie Stavila, Chandrabhas Narayana, Błażej Scheibe, Štěpán Kment, Michal Otyepka, Nunzio Motta, Deepak Dubal, Radek Zbořil, and Roland A. Fischer
Abstract: 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.
Keywords: D materials; asymmetric supercapacitors; covalent assemblies; metal- organic frameworks; MXenes
Description: First published: 04 December 2020
Rights: © The Authors. Advanced Materials published by Wiley-VCH GmbH. © 2020 The Authors. Advanced Materials published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which per- mits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adap- tations are made.
DOI: 10.1002/adma.202004560
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