High-performance Ti3C2Tx achieved by polyaniline intercalation and gelatinization as a high-energy cathode for zinc-ion capacitor

作者：Peng Liao, Ziyu Geng, Xin Zhang, Wenjie Yan, Zenghui Qiu, Haijun Xu · 发表于：Nano Research · 年份：2024 · DOI：10.1007/s12274-024-6531-7 · 被引用次数：20 · 研究领域：Supercapacitor Materials and Fabrication、MXene and MAX Phase Materials、Advancements in Battery Materials

The actual manufacture of supercapacitors (SCs) is restricted by the inadequate energy density, and the energy density of devices can be properly promoted by assembling zinc-ion capacitors (ZICs) which used capacitive cathode and battery-type anode. Two-dimensional (2D) MXene has brought great focuses in the electrode research on the foundation of large redox-active surface, but the specific capacitance is still affected by the tight stacking of interlaminations. Ti 3 C 2 T x @polyaniline (PANI) heterostructures are prepared by uniformly depositing the conductive polymer PANI nanorods as the intercalation agent into the external of Ti 3 C 2 T x nanosheets to inhibit stacking. Subsequently, by using graphene oxide (GO)-assisted low-temperature hydrothermal self-assembly manufacture, 2D heterostructures are assembled into the three-dimensional (3D) porous crosslinked Ti 3 C 2 T x @PANI-reduced graphene oxide (RGO) hydrogels. Attributed to the synergistic work of PANI nanorods, Ti 3 C 2 T X nanosheets, and 3D crosslinking frameworks of RGO to match capacitive and battery effects, 3D porous hierarchical Ti 3 C 2 T x @PANI-RGO heterostructure hydrogels have rich ion transport channels, a large number of active sites, and excellent reaction kinetics. ZIC is assembled by using Ti 3 C 2 T x @PANI-RGO heterostructure hydrogels as cathodes and zinc foil as anodes. In this work, Ti 3 C 2 T x @PANI-RGO//Zn ZIC exhibits a wide working window (2.0 V), marked specific capacitance (589.89 F·...