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Fast Gelation of Ti 3 C 2 T x MXene Initiated by Metal Ions
Author(s) -
Deng Yaqian,
Shang Tongxin,
Wu Zhitan,
Tao Ying,
Luo Chong,
Liang Jiachen,
Han Daliang,
Lyu Ruiyang,
Qi Changsheng,
Lv Wei,
Kang Feiyu,
Yang QuanHong
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201902432
Subject(s) - mxenes , materials science , graphene , dispersion (optics) , supercapacitor , aqueous solution , oxide , nanomaterials , ion , metal ions in aqueous solution , nanotechnology , metal , chemical engineering , graphitic carbon nitride , inorganic chemistry , electrode , electrochemistry , chemistry , catalysis , photocatalysis , organic chemistry , physics , engineering , optics , metallurgy
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, Fe 2+ 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 (≈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.