Laser Patterned In-Plane Asymmetric MXene//LIG@MnO Microsupercapacitor for Self-Powered Pressure Detection Systems

Wearable and portable microelectronic devices are attracting growing attention in the scientific and technological fields. The preparation of high-performance micro energy storage devices in self-sustaining flexible electronic systems still needs further studies. In this work, we have developed a preparation method for asymmetric microsupercapacitors (AMSCs). The MnO cathodes are fabricated by laser irradiation, which converts manganese acetate into manganese oxide on the hydrophilic laser-induced graphene interdigitated electrodes. By controlling the number of drop-coating cycles of the manganese acetate solution, precise control over MnO loading is achieved. We investigated the impacts of laser power and scanning direction on the phase and performance of the MnO cathodes, establishing the optimal laser processing parameters. The MXene//MnOAMSC after capacity matching demonstrates excellent rate performance (maintaining 82% even at 10 times the current density of 0.1 mA cm^-2), outstanding mechanical flexibility, and long-term cycling stability (90% capacitance retention after 10,000 cycles). Furthermore, by serially connecting a solar cell, an AMSC, and pressure-sensitive elements, a self-powered pressure detection system is constructed. This integrated system exhibits a clear current response to finger bending, elbow bending, and finger touch.