Super-tough MXene-functionalized graphene sheets

Tianzhu Zhou, Chao Wu, Yanlei Wang, Antoni P. Tomsia, Mingzhu Li, Eduardo Saiz, Shaoli Fang, Ray H. Baughman, Lei Jiang and Qunfeng Cheng ()
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Tianzhu Zhou: Beihang University
Chao Wu: Beihang University
Yanlei Wang: Chinese Academy of Sciences
Antoni P. Tomsia: Beijing Advanced Innovation Center for Biomedical Engineering
Mingzhu Li: Institute of Chemistry Chinese Academy of Sciences
Eduardo Saiz: Department of Materials, Imperial College London
Shaoli Fang: University of Texas at Dallas
Ray H. Baughman: University of Texas at Dallas
Lei Jiang: Beihang University
Qunfeng Cheng: Beihang University

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract Flexible reduced graphene oxide (rGO) sheets are being considered for applications in portable electrical devices and flexible energy storage systems. However, the poor mechanical properties and electrical conductivities of rGO sheets are limiting factors for the development of such devices. Here we use MXene (M) nanosheets to functionalize graphene oxide platelets through Ti-O-C covalent bonding to obtain MrGO sheets. A MrGO sheet was crosslinked by a conjugated molecule (1-aminopyrene-disuccinimidyl suberate, AD). The incorporation of MXene nanosheets and AD molecules reduces the voids within the graphene sheet and improves the alignment of graphene platelets, resulting in much higher compactness and high toughness. In situ Raman spectroscopy and molecular dynamics simulations reveal the synergistic interfacial interaction mechanisms of Ti-O-C covalent bonding, sliding of MXene nanosheets, and π-π bridging. Furthermore, a supercapacitor based on our super-tough MXene-functionalized graphene sheets provides a combination of energy and power densities that are high for flexible supercapacitors.

Date: 2020
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DOI: 10.1038/s41467-020-15991-6

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