Super-tough MXene-functionalized graphene sheets

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...

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Bibliographic Details
Published in:Nature communications 2020-04, Vol.11 (1), p.2077-2077, Article 2077
Main Authors: Zhou, Tianzhu, Wu, Chao, Wang, Yanlei, Tomsia, Antoni P., Li, Mingzhu, Saiz, Eduardo, Fang, Shaoli, Baughman, Ray H., Jiang, Lei, Cheng, Qunfeng
Format: Article
Language:English
Subjects:
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639/301/357/918/1053
639/4077/4079/4105
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639/925/357/1018
Crosslinking
Energy storage
Graphene
Humanities and Social Sciences
Limiting factors
Mechanical properties
Molecular dynamics
multidisciplinary
MXenes
Nanostructure
Platelets
Platelets (materials)
Portable equipment
Raman spectroscopy
Science
Science (multidisciplinary)
Sheets
Storage systems
Supercapacitors
Toughness
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Summary: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. Poor mechanical properties of reduced graphene oxide sheets hinder development of flexible energy storage systems. MXene functionalised graphene oxide with Ti-O-C bonding and additional crosslinking is here reported to dramatically increase toughness for flexible supercapacitors.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-020-15991-6