Fabrication of Dual‐Functional MXene@NiCo <sub>2</sub> S <sub>4</sub> Composites with Enhanced Nonlinear Optical and Electrochemical Properties
Jinhe Wei, Fei Hu, Chenglong Lv, Limin Bian, Xinyu Quan, Qiuyun Ouyang
Abstract
Abstract The design and synthesis of multifunctional nanomaterials have attracted considerable attention for expanding the range of practical applications. Herein, a metal–organic framework (MOFs)‐derived NiCo 2 S 4 attached to MXene is rationally designed and constructed for an optical limiter and supercapacitor. The MOF‐derived NiCo 2 S 4 enhances the tendency of hydroxyl groups on the MXene surface to attract metal ions, resulting in the formation of sulfur vacancies. Moreover, MXene offers a high specific surface area to facilitate the rapid complexation of charge carriers. The resultant MXene@NiCo 2 S 4 (MX@NCS) exhibits markedly enhanced nonlinear optical (NLO) and electrochemical properties through synergistic interactions between the components. The NLO properties can be further optimized by adjusting the amount of MX@NCS powder dispersed in methyl methacrylate (MX@NCS) 2–6 /PMMA) by using the Z‐scan technique. Specifically, the (MX@NCS) 4 /PMMA exhibits the strongest reverse saturable absorption (RSA) and self‐defocusing effects at 100 µJ with β = 3.87 × 10 2 cm·GW −1 and γ = −5.94 × 10 −4 cm 2 ·GW −1 . Concurrently, the constructed supercapacitor shows a superior energy density of 51.21 Wh·kg −1 at a power density of 863.65 W·kg −1 . Notably, the present study indicates a novel strategy to explore the application of materials in the development of efficient optical limiter and supercapacitor technologies.