褶皱状少层Ti3C2 MXene的制备及超级电容性能研究OA

To address the critical issue of hindered ion transport and degraded supercapacitor performance caused by interlayer self-stacking of Ti3C2 MXene electrode materials,this study employed an aqueous solution of high-proportion few-layer Ti3C2 MXene(96％consisting of 1-3 layers)as the precursor.Different organic solvents,ethanol(ET),acetonitrile(AN),and dimethyl sulfoxide(DMSO),were combined with a rotary evaporation process to regulate the structure and morphology of the material.The influences of the organic solvent type on the interlayer spacing,micromorphology,and electrochemical behavior of the material were systematically investigated.The structure and morphology of the material were characterized using X-ray diffraction,scanning electron microscopy,and Fourier transform infrared spectroscopy.The energy storage performance of the corrugated Ti3C2 MXene in symmetric supercapacitors and flexible micro-supercapacitors was evaluated using cyclic voltammetry,galvanostatic charge-discharge,electrochemical impedance spectroscopy,and relaxation time distribution analysis.X-ray diffraction results demonstrate that organic solvent treatment significantly enlarges the interlayer spacing of MXene,with the extent of expansion following the order DMSO>ET>AN.Scanning electron microscopy images reveal that all modified materials exhibit a corrugated morphology,which effectively suppresses interlayer stacking.Electrochemical tests indicate that the ET-modified sample delivers the highest specific capacitance at low current densities,making it suitable for high-capacity energy storage applications.The AN-modified sample exhibits the lowest charge transfer resistance and ion diffusion resistance,resulting in optimal high-rate charge-discharge performance.In micro-supercapacitors,the ET-modified electrode presents significantly higher areal specific capacitance and better capacity retention rate than the unmodified sample.This study achieves precise structural regulation of Ti3C2 MXene via an organic solvent modification strategy without the use of exogenous intercalators,providing experimental evidence and a viable route for the design and fabrication of high-performance MXene-based energy storage devices.