Microwave-Assisted Synthesis of Few-Layer Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> Loaded with Ni<sub>0.5</sub>Co<sub>0.5</sub>Se<sub>2</sub> Nanospheres for High-Performance Supercapacitors

oleh: Linghong Wu, Juan Shen, Bo Jin

Format: Article
Diterbitkan: MDPI AG 2024-05-01

Deskripsi

Transition metal selenides have high theoretical capacities, making them attractive candidates for energy storage applications. Here, using the microwave-absorbing properties of the materials, we designed a simple and efficient microwave-assisted synthesis method to produce a composite made of nanospheres Ni<sub>0.5</sub>Co<sub>0.5</sub>Se<sub>2</sub> (NCSe) and highly conductive, stable Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene. The Ni<sub>0.5</sub>Co<sub>0.5</sub>Se<sub>2</sub>/Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> composites are characterized via scanning electron microscopy, X-ray diffraction, cyclic voltammetry, and electrochemical impedance spectroscopy. The findings indicate that 3D Ni<sub>0.5</sub>Co<sub>0.5</sub>Se<sub>2</sub> bimetallic selenide nanospheres were uniformly loaded within the few-layer Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene wrapper in a short period. The optimal NCSe/Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>−2 electrode can demonstrate a specific capacitance of 752.4 F g<sup>–1</sup> at 1 A g<sup>–1</sup>. Furthermore, the asymmetric supercapacitor combined with activated carbon maintains a capacitance retention of 110% even after 5000 cycles. The method of directly growing active substances on few-layer Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene will provide inspiration for the manufacture of high-pseudocapacitance supercapacitors.