期刊
JOURNAL OF ENERGY CHEMISTRY
卷 46, 期 -, 页码 105-113出版社
ELSEVIER
DOI: 10.1016/j.jechem.2019.10.023
关键词
MXene; Hetero-assembly; Supercapacitor; Volumetric performance; Heterostructure
资金
- National Natural Science Foundation of China [21571040]
- Young Top-Notch Talent of National Ten Thousand Talent Program, Heilongjiang Touyan Innovation Team Program
- Fundamental Research Funds for the Central Universities
It is highly desirable to design and synthesize two-dimensional nanostructured electrode materials with high electrical conductivity, large electrolyte-accessible surface area and more exposed active sites for energy storage applications. Herein, MXene/CoAl-LDH heterostructure has been prepared through electrostatic ordered hetero-assembly of monolayer MXene and edge-rich CoAl-LDH nanosheets in a faceto-face manner on molecular-scale for supercapacitor applications. Benefiting from the unique structure, strong interfacial interaction and synergistic effects between MXene and CoAl-LDH nanosheets, the electrical conductivity and exposed electrolyte-accessible active sites are significantly enhanced. The as-prepared MXene/CoAl-LDH-80% (ML-80) film exhibits high volumetric capacity of 2472 C cm(-3) in 3 M KOH electrolyte with high rate capability of 70.6% at 20 A g(-1). Notably, to the best of our knowledge, the high volumetric capacity is the highest among other previously reported values for supercapacitors in aqueous electrolytes. Furthermore, our asymmetric supercapacitor device fabricated with ML-80 and MXene/graphene composite as cathode and anode, respectively, exhibits impressive volumetric energy density of 85.4 Wh L-1 with impressive cycling stability of 94.4% retention ratio after 30,00 0 continuous charge/discharge cycles. (C) 2019 Science Pressand Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
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