期刊
ADVANCED FUNCTIONAL MATERIALS
卷 29, 期 33, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201903960
关键词
3D assembly; monoliths; MXene hydrogels; rate performance
类别
资金
- National Science Fund for Distinguished Young Scholars of China [51525204]
- National Natural Science Foundation of China [51702229]
- Fundamental Research Funds for the Central Universities [YJ201886]
Assembly of 2D MXene sheets into a 3D macroscopic architecture is highly desirable to overcome the severe restacking problem of 2D MXene sheets and develop MXene-based functional materials. However, unlike graphene, 3D MXene macroassembly directly from the individual 2D sheets is hard to achieve for the intrinsic property of MXene. Here a new gelation method is reported to prepare a 3D structured hydrogel from 2D MXene sheets that is assisted by graphene oxide and a suitable reductant. As a supercapacitor electrode, the hydrogel delivers a superb capacitance up to 370 F g(-1) at 5 A g(-1), and more promisingly, demonstrates an exceptionally high rate performance with the capacitance of 165 F g(-1) even at 1000 A g(-1). Moreover, using controllable drying processes, MXene hydrogels are transformed into different monoliths with structures ranging from a loosely organized porous aerogel to a dense solid. As a result, a 3D porous MXene aerogel shows excellent adsorption capacity to simultaneously remove various classes of organic liquids and heavy metal ions while the dense solid has excellent mechanical performance with a high Young's modulus and hardness.
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