Electrostatic-Assembled MXene@NiAl-LDHs Electrodes with 3D Interconnected Networks Architectures for High-Performance Pseudocapacitor Storage

Multifarious layered electrode materials are attracting increased attention in the field of energy storage because of their high specific surface and interlayer modifiability. However, the natural tendency to be re-superimposed and the inherent disadvantages of a single layered electrode significantly affect electronic transport and ion migration. Considering the poor electrochemical performance and low structural stability, a novel MXene@PDDA/NiAl-LDHs hybrids as supercapacitor electrode via an electrostatic-assembled approach is elaborately designed. The alternate MXene and PDDA/NiAl-LDHs layers with 3D interconnected networks architectures could ensure intimate contact to efficiently take advantage of high electron conductivity of MXene and high pseudocapacitance activity of PDDA/NiAl-LDHs, thus effectively accelerating the ionic/electronic transport rates and improving the electrochemical storage of hybrid electrodes. As a consequence, as an electrode for supercapacitor, the MXene@PDDA/NiAl-LDHs exhibits a high specific capacitance of 1825.8 F g −1 at a current density of 1.0 A g −1 , a remarkable synergetic effect, leading to a high rate capability after 100 cycles at different current densities and long cycling stability with only 0.9% degradation after 5000 cycles at 5.0 A g −1 . This work provides a strategy for 2D layered materials to design electrodes with excellent electrochemical performance in the field of energy storage.