期刊
NANO-MICRO LETTERS
卷 12, 期 1, 页码 -出版社
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-020-00473-7
关键词
Sodium-ion capacitors; MXene; Fast kinetics; Triazine polymerization; Nitrogen doping
资金
- National Key Research and Development Program [2018YFB1107500]
- National Natural Science Foundation of China [51503024]
- Fundamental Research Funds for the Central Universities [DUT17RC(3)003, DUT18RC(4)033]
- National Natural Science Foundation of the Joint Fund Key Projects [U1663226]
2D MXenes are attractive for energy storage applications because of their high electronic conductivity. However, it is still highly challenging for improving the sluggish sodium (Na)-ion transport kinetics within the MXenes interlayers. Herein, a novel nitrogen-doped Ti(3)C(2)T(x)MXene was synthesized by introducing the in situ polymeric sodium dicyanamide (Na-dca) to tune the complex terminations and then utilized as intercalation-type pseudocapacitive anode of Na-ion capacitors (NICs). The Na-dca can intercalate into the interlayers of Ti(3)C(2)T(x)nanosheets and simultaneously form sodium tricyanomelaminate (Na3TCM) by the catalyst-free trimerization. The as-prepared Ti3C2Tx/Na3TCM exhibits a high N-doping of 5.6 at.% in the form of strong Ti-N bonding and stabilized triazine ring structure. Consequently, coupling Ti3C2Tx/Na3TCM anode with different mass of activated carbon cathodes, the asymmetric MXene//carbon NICs are assembled. It is able to deliver high energy density (97.6 Wh kg(-1)), high power output (16.5 kW kg(-1)), and excellent cycling stability (approximate to 82.6% capacitance retention after 8000 cycles).
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