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Zhao, Zhilin; Wu, Xinming; Luo, Chunyan; Wang, Yan; Chen, Weixing
Journal of colloid and interface science, March 2022, 2022-03-00, 20220301, Letnik: 609Journal Article
The interlayer assembled electrode modified with surface functionalized Ti3C2Cl2 MXene nanodots exhibit excellent pseudocapacitor storage performance (2010.8F g−1 at 1.0 A g−1, 94.1% capacity retention after 10,000 cycles). Display omitted Although electrodes based on two dimensional hybrids with interstratification-assemble have been widely studied for supercapacitors, the performance enhancement still remains challenge mainly due to the random dispersion of surface passivated two dimensional nanosheets. Herein, a new covalent surface functionalization of MXene-based Ti3C2Cl2 nanodots-interspersed MXene@NiAl-layered double hydroxides (QD-Ti3C2Cl2@NiAl-LDHs) hybrid electrode with superior pseudocapacitor storage performance has been elaborately designed by electrostatic-assembled. As a result, the QD-Ti3C2Cl2@NiAl-LDHs electrode exhibits a super specific capacitance of 2010.8F g−1 at 1.0 A g−1 and high energy density of 100.5 Wh kg−1 at a power density of 299.8 W kg−1. In addition, 94.1% capacitance retention is achieved after cycling for 10,000 cycles at 1.0 A g−1, outperforming previously reported of two dimensional hybrids electrode for supercapacitor. Furthermore, density functional theory (DFT) calculations show that the superior pseudocapacitor storage performance of the QD-Ti3C2Cl2@NiAl-LDHs may be attributed to the creation of numerous electrochemical active sites and the enhancement of electrical conductivity by the QD-Ti3C2Cl2 MXene. This work provides new strategy for developing excellent pseudocapacitor supercapacitor based on two dimensional hybrid electrode.
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