Micro‐supercapacitors (MSCs) with excellent flexibility and high electrochemical performance are essential for portable and miniaturized electronics. In this paper, a laser etching technology with advantages of simple process, low cost, and high machining accuracy is used to directly etch the free‐standing MXene‐molybdenum disulfide (MoS2) film for MSC. As adding MoS2 in MXene effectively improves the electrochemical performance, such as a higher specific capacitance (about 60% higher than pure MXene). Eventually, the maximum specific capacitance of this MSC (based on the total volume of positive and negative electrodes) is 173.6 F cm−3 (1 mV s−1), and the maximum energy density and maximum power density are 15.5 mWh cm−3 and 0.97 W cm−3, respectively. In addition, the MSC also shows the excellent cycle stability and flexibility, e.g., after 6000 charge–discharge cycles and bending up to 150°, the capacitances of the MSC still retain about 98% and 89% of its initial capacitance, respectively. The laser‐etched MSC based on MXene‐MoS2 offers a new idea for future high‐performance micro energy storage devices.
In this paper, the surface properties of polyacrylonitrile-based carbon fibers is improved by electron-beam (EB) irradiation in maleic anhydride/acetone solution at 100, 150, 200 and 150 KGy. Experimental study of this paper is carried out to identify surface topography, surface chemical composition and functional groups, adsorption ability and interface properties of CF/ epoxy composites. The results reveal that the roughness of carbon fiber surface is increased obviously after modification by EB irradiation grafting technology. The ratio value of O/C and the relative content of oxygen functional groups on fiber surface are improved effectively, comparing with the unmodified carbon fiber. Besides, adsorption of carbon fiber on epoxy and the mechanical performance of CF/epoxy composites are clearly enhanced after irradiation grafting modification.
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