An MXene/Poly(vinyl alcohol)/Reduced Graphene Oxide Nanocomposite Aerogel as an Ultra-stable Electrode for Capacitive Storage

作者：Yu Lu, Jie Bai, Binbin Sun, Nannan Li, Cong Wang, Zhenhuai Yang, Qiang Wang · 发表于：ACS Applied Nano Materials · 年份：2025 · DOI：10.1021/acsanm.5c01634 · 被引用次数：6 · 研究领域：MXene and MAX Phase Materials、Supercapacitor Materials and Fabrication、Advanced Sensor and Energy Harvesting Materials

Currently, high-performance energy storage devices have requirements for electrode materials such as high power density, good stability, and high storage efficiency in various applications. The restacking of two-dimensional MXene nanosheets significantly impacts the performances of energy storage devices. Although three-dimensional (3D) electrode structures exhibit enhanced energy storage capacities, they possess poor stabilities and low storage efficiencies. These issues are addressed in the current study using a directional freeze-drying method and a one-step hydrothermal process to fabricate a nanoscale porous interconnected MXene/PVA (poly(vinyl alcohol))/rGO (reduced graphene oxide) composite aerogel electrode for supercapacitor applications. The rGO provides a stable conductive skeleton, while the hydrophilic PVA acts as a binder to strengthen the interactions between MXene and rGO, and contributes to the capacitance after carbonization. The resulting 3D composite aerogel increased the interlayer spacing of the Ti 3 C 2 T x MXene, enabling efficient electrolyte penetration and ion transport. Due to the synergistic effect of the MXene pseudocapacitance and the rGO double-layer capacitance, the prepared aerogel exhibited a maximum specific capacitance of 489.7 F g –1 at a scan rate of 2 mV s –1 . Furthermore, it demonstrated an excellent energy density of 30.2 W h kg –1 at a power density of 2040 W kg –1 . After 10,000 charge/discharge cycles at a current density of 10 A ...