Journal
NANO-MICRO LETTERS
Volume 14, Issue 1, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-021-00781-6
Keywords
MXenes; Aerogel; Room-temperature assembly; Interfacial engineering; Sodium-ion storage
Funding
- National Natural Science Foundation of China [52071137, 51977071, 51802040, 21802020]
- Science and Technology Innovation Program of Hunan Province [2021RC3066, 2021RC3067]
- Natural Science Foundation of Hunan Province [2020JJ3004, 2020JJ4192]
- Fundamental Research Funds for the Central Universities
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This study reports on the low-temperature assembly of MXene nanosheets into robust three-dimensional aerogels. By using suitable cross-linking agents, graphene oxide-assisted assembly of Ti3C2Tx MXene aerogel with high Ti3C2Tx content and robustness was achieved. Further modification allowed for the use of this aerogel as a freestanding anode for sodium-ion storage, demonstrating promising electrochemical performances.
Low-temperature assembly of MXene nanosheets into three-dimensional (3D) robust aerogels addresses the crucial stability concern of the nano-building blocks during the fabrication process, which is of key importance for transforming the fascinating properties at the nanoscale into the macroscopic scale for practical applications. Herein, suitable cross-linking agents (amino-propyltriethoxysilane, Mn2+, Fe2+, Zn2+, and Co2+) as interfacial mediators to engineer the interlayer interactions are reported to realize the graphene oxide (GO)-assisted assembly of Ti3C2Tx MXene aerogel at room temperature. This elaborate aerogel construction not only suppresses the oxidation degradation of Ti3C2Tx but also generates porous aerogels with a high Ti3C2Tx content (87 wt%) and robustness, thereby guaranteeing the functional accessibility of Ti3C2Tx nanosheets and operational reliability as integrated functional materials. In combination with a further sulfur modification, the Ti3C2Tx aerogel electrode shows promising electrochemical performances as the freestanding anode for sodium-ion storage. Even at an ultrahigh loading mass of 12.3 mg cm(-2), a pronounced areal capacity of 1.26 mAh cm(-2) at a current density of 0.1 A g(-1) has been achieved, which is of practical significance. This work conceptually suggests a new way to exert the utmost surface functionalities of MXenes in 3D monolithic form and can be an inspiring scaffold to promote the application of MXenes in different areas.
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