期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 20, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202101087
关键词
graphene; MXene; self-assembly; specific capacitance; supercapacitors
类别
资金
- National Natural Science Foundation of China [22005076, 21571040]
- Young Top-Notch Talent of National Ten Thousand Talent Program
- Fundamental Research Funds for the Central Universities
- Heilongjiang Touyan Innovation Team Program
A fast and efficient self-assembly route was demonstrated to prepare a 3D porous oxidation-resistant MXene/graphene composite, which effectively prevents the oxidation and self-restacking of MXene, ensuring outstanding electrical conductivity, specific capacitance, and cycling stability. This work paves a new avenue to solve the long-standing challenges of MXene.
2D MXene materials have attracted intensive attention in energy storage application. However, MXene usually undergoes serious face-to-face restacking and inferior stability, significantly preventing its further commercial application. Herein, to suppress the oxidation and self-restacking of MXene, an efficient and fast self-assembly route to prepare a 3D porous oxidation-resistant MXene/graphene (PMG) composite with the assistance of an in situ sacrificial metallic zinc template is demonstrated. The self-assembled 3D porous architecture can effectively prevent the oxidation of MXene layers with no evident variation in electrical conductivity in air at room temperature after two months, guaranteeing outstanding electrical conductivity and abundant electrochemical active sites accessible to electrolyte ions. Consequently, the PMG-5 electrode possesses a striking specific capacitance of 393 F g(-1), superb rate performance (32.7% at 10 V s(-1)), and outstanding cycling stability. Furthermore, the as-assembled asymmetric supercapacitor possesses a pronounced energy density of 50.8 Wh kg(-1) and remarkable cycling stability with a 4.3% deterioration of specific capacitance after 10 000 cycles. This work paves a new avenue to solve the two long-standing significant challenges of MXene in the future.
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