期刊
ADVANCED MATERIALS
卷 31, 期 43, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201902432
关键词
3D assembly; gelation; monoliths; MXene; supercapacitors
类别
资金
- National Natural Science Foundation of China [U1601206, 51972228]
- National Science Fund for Distinguished Young Scholars, China [51525204]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01N111]
- Guangdong Natural Science Funds for Distinguished Young Scholars [2017B030306006]
- Guangdong Special Support Program [2017TQ04C664]
- Shenzhen Basic Research Project [JCYJ20170412171359175, JCYJ20180508152037520]
- Shenzhen Graphene Manufacturing Innovation Center [201901161513]
Gelation is an effective way to realize the self-assembly of nanomaterials into different macrostructures, and in a typical use, the gelation of graphene oxide (GO) produces various graphene-based carbon materials with different applications. However, the gelation of MXenes, another important type of 2D materials that have different surface chemistry from GO, is difficult to achieve. Here, the first gelation of MXenes in an aqueous dispersion that is initiated by divalent metal ions is reported, where the strong interaction between these ions and -OH groups on the MXene surface plays a key role. Typically, Fe2+ ions are introduced in the MXene dispersion which destroys the electrostatic repulsion force between the MXene nanosheets in the dispersion and acts as linkers to bond the nanosheets together, forming a 3D MXene network. The obtained hydrogel effectively avoids the restacking of the MXene nanosheets and greatly improves their surface utilization, resulting in a high rate performance when used as a supercapacitor electrode (approximate to 226 F g(-1) at 1 V s(-1)). It is believed that the gelation of MXenes indicates a new way to build various tunable MXene-based structures and develop different applications.
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