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Room-Temperature Assembled MXene-Based Aerogels for High Mass-Loading Sodium-Ion Storage.
- Source :
- Nano-Micro Letters; 2022, Vol. 14 Issue 1, p1-14, 14p
- Publication Year :
- 2022
-
Abstract
- Highlights: Room temperature graphene oxide-assisted assembly of 3D Ti<subscript>3</subscript>C<subscript>2</subscript>T<subscript>x</subscript> MXene aerogels have been realized by introducing interfacial mediators (amino-propyltriethoxysilane, Mn<superscript>2+</superscript>, Fe<superscript>2+</superscript>, Zn<superscript>2+</superscript>, and Co<superscript>2+</superscript>). The methodology not only suppresses the oxidation degradation of Ti<subscript>3</subscript>C<subscript>2</subscript>T<subscript>x</subscript>, but also generates porous aerogels with a high Ti<subscript>3</subscript>C<subscript>2</subscript>T<subscript>x</subscript> content (87 wt%) and robustness. As freestanding electrode of the as-prepared Ti<subscript>3</subscript>C<subscript>2</subscript>T<subscript>x</subscript>-based aerogel with a practical-level mass loading of 12.3 mg cm<superscript>-2</superscript> still delivers an areal capacity of 1.26 mAh cm<superscript>-2</superscript> at a current density of 0.1 A g<superscript>-1</superscript>. 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, Mn<superscript>2+</superscript>, Fe<superscript>2+</superscript>, Zn<superscript>2+</superscript>, and Co<superscript>2+</superscript>) as interfacial mediators to engineer the interlayer interactions are reported to realize the graphene oxide (GO)-assisted assembly of Ti<subscript>3</subscript>C<subscript>2</subscript>T<subscript>x</subscript> MXene aerogel at room temperature. This elaborate aerogel construction not only suppresses the oxidation degradation of Ti<subscript>3</subscript>C<subscript>2</subscript>T<subscript>x</subscript> but also generates porous aerogels with a high Ti<subscript>3</subscript>C<subscript>2</subscript>T<subscript>x</subscript> content (87 wt%) and robustness, thereby guaranteeing the functional accessibility of Ti<subscript>3</subscript>C<subscript>2</subscript>T<subscript>x</subscript> nanosheets and operational reliability as integrated functional materials. In combination with a further sulfur modification, the Ti<subscript>3</subscript>C<subscript>2</subscript>T<subscript>x</subscript> 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<superscript>−2</superscript>, a pronounced areal capacity of 1.26 mAh cm<superscript>−2</superscript> at a current density of 0.1 A g<superscript>−1</superscript> 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- AEROGELS
SODIUM ions
GRAPHENE oxide
NANOSTRUCTURED materials
STORAGE
Subjects
Details
- Language :
- English
- ISSN :
- 23116706
- Volume :
- 14
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nano-Micro Letters
- Publication Type :
- Academic Journal
- Accession number :
- 154707059
- Full Text :
- https://doi.org/10.1007/s40820-021-00781-6