期刊
RARE METALS
卷 41, 期 6, 页码 2084-2093出版社
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-021-01935-6
关键词
MXene; Holey graphene; Supercapacitor; Ion channel
资金
- National Key R&D Program of China [2017YFA0304203]
- National Natural Science Foundation of China [21805174, 51902190]
- Key Research and Development Program of Shanxi Province for International Cooperation [201803D421082]
- Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi [2019L0013, 2019L0018]
- Shanxi Scholarship Council of China [2021-004]
- Program of Introducing Talents of Discipline to Universities [D18001]
- Changjiang Scholars and Innovative Research Team at the University of Ministry of Education of China [IRT_17R70]
- Fund for Shanxi 1331 Project
This study successfully engineered MXene/HG electrodes with unimpeded ion transport channels by adjusting the size of MXene flakes and introducing holey graphene nanosheets, leading to improved performance of supercapacitors.
MXene has given great promises to supercapacitor electrode material due to its high conductivity and redox properties. However, the self-agglomeration of the MXene lamella will reduce its contact area with the electrolyte and generate a tortuous transportation pathway of the electrolyte ions, thereby reducing its capacitive performance and rate capability. In this work, we engineered the electrolyte ion channels by adjusting the MXene lamella size and inserting holey graphene (HG) nanosheets into the interlayer of the MXene flakes. The developed MXene/HG electrode can not only avoid the self-restacking of MXene but also provide unimpeded ion transport channels. As a result, the supercapacitive and rate performances of the small MXene lamella-based MXene/HG (S-MXene/HG) supercapacitor are prominently ameliorated. By adjusting the content of HG, the S-MXene/HG(0.05) electrode exhibits excellent gravimetric capacitance of 446 F center dot g(-1) and a rate capability of 77.5%. The S-MXene/HG(0.05)-based symmetric supercapacitor provides an impressive energy density of 14.84 Wh center dot kg(-1) with excellent cyclic stability of 96% capacitance retention after 10,000 cycles. This demonstration of the engineering of the ion channels shows great potential in two-dimensional material-based supercapacitor electrodes.
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