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.

尽管基于二维杂化和层间组装的电极已被广泛研究用于超级电容器，但由于表面钝化二维纳米片的随机分散，性能增强仍然存在挑战。在此，基于 MXene 的 Ti ₃ C ₂ Cl ₂纳米点散布的 MXene@NiAl 层状双氢氧化物（QD-Ti ₃ C ₂ Cl ₂ @NiAl-LDHs）混合电极的新型共价表面功能化具有优异的赝电容器存储性能。由静电组装精心设计。因此，QD-Ti ₃ C ₂ Cl ₂@NiAl-LDHs 电极在 1.0 A g ^{-1 时}表现出 2010.8F g ^-1的超比电容和 100.5 Wh kg ^{-1 的}高能量密度，在 299.8 W kg ^-1的功率密度下。此外，在以 1.0 A g ^-1循环 10,000 次循环后实现了 94.1% 的电容保持率，优于先前报道的用于超级电容器的二维混合电极。此外，密度泛函理论 (DFT) 计算表明，QD-Ti ₃ C ₂ Cl ₂ @NiAl-LDHs优异的赝电容器存储性能可能归因于大量电化学活性位点的产生和 QD 对导电性的增强-Ti₃ C ₂ Cl ₂ MXene。这项工作为开发基于二维混合电极的优异赝电容器超级电容器提供了新的策略。