A La ₂ O ₃ /MXene composite electrode for supercapacitors with improved capacitance and cycling performance

Abstract

Developing efficient electrode materials is a key towards high power electrochemical energy storage devices. Two-dimensional (2D) MXene shows excellent conductivity and electrochemical performance among other materials. However, the restacking of MXene layers may degrade their specific capacity and cycling performance. Considering this challenge, here we have designed a composite made of 2D MXene nanosheets and lanthanum oxide (La 2 O 3 ) nanoparticles to overcome the limitations. The bifunctionality of La 2 O 3 nanoparticles prevents the restacking of MXene layers and enhances the electrochemical properties of the electrode due to its good Faradic characteristics. The specific capacitance of the La 2 O 3 /MXene composite electrode is 366 F/g at 1 A/g, which is 4.5 and 3 times higher than those of the individual La 2 O 3 and MXene. The composite electrode displays a capacitance retention of 96% after 1,000 cycles, which is due to synergistic effects between the two components and indicates the potential of La 2 O 3 /MXene composite for supercapacitors.

Ti3C2-MXene/NiO Nanocomposites-Decorated CsPbI3 Perovskite Active Materials under UV-Light Irradiation for the Enhancement of Crystal-Violet Dye Photodegradation

“…This behavior can be attributed to the presence of NiO sheets on the surface of Ti 3 C 2 -MXene, which contribute to this increased resistance. The Ti 3 C 2 -MXene/NiO/CsPbI 3 composites stood out in the Nyquist plot by displaying the smallest diameter among the samples [43]. This observation confirmed the lowest resistance and highest conductivity compared to the Ti 3 C 2 -MXene nanosheets and Ti 3 C 2 -MXene/NiO samples [44,45].…”

A Simplified Method for the Preparation of Highly Conductive and Flexible Silk Nanofibrils/MXene Membrane

“…As a recent emerged two-dimensional (2D) transition-metal carbides and/or nitrides [42], MXene has been widely used in functional materials based on its unique structure [43] and excellent electrical properties [44]. Since Y. Gogotsi et al first reported the application of MXene in EMI shielding in 2016 [45], MXene has been widely noted for its low density and ease of processing compared to metal materials [46,47].…”