3D Hierarchical Ti 3 C 2 T X @PANI-Reduced Graphene Oxide Heterostructure Hydrogel Anode and Defective Reduced Graphene Oxide Hydrogel Cathode for High-Performance Zinc Ion Capacitors

作者：Peng Liao, Zenghui Qiu, Xin Zhang, Wenjie Yan, Haijun Xu, Colton Jones, Shaowei Chen · 发表于：ACS Applied Materials & Interfaces · 年份：2023 · DOI：10.1021/acsami.3c11035 · 被引用次数：17 · 研究领域：MXene and MAX Phase Materials、Advancements in Battery Materials、Advanced Memory and Neural Computing

The practical application of supercapacitors (SCs) has been known to be restricted by low energy density, and zinc ion capacitors (ZICs) with a capacitive cathode and a battery-type anode have emerged as a unique technology that can effectively mitigate the issue. To this end, the design of electrodes with low electrochemical impedance, high specific capacitance, and outstanding reaction stability represents a critical first step. Herein, we report the synthesis of hierarchical Ti 3 C 2 T X @PANI heterostructures by uniform deposition of conductive polyaniline (PANI) polymer nanofibers on the exposed surface of the Ti 3 C 2 T X nanosheets, which are then assembled into a three-dimensional (3D) cross-linking framework by a graphene oxide (GO)-assisted self-convergence hydrothermal strategy. This resulting 3D Ti 3 C 2 T X @PANI-reduced graphene oxide (Ti 3 C 2 T X @PANI-RGO) heterostructure hydrogel shows a large surface area (488.75 F g –1 at 0.5 A g –1 ), outstanding electrical conductivity, and fast reaction kinetics, making it a promising electrode material. Separately, defective RGO (DRGO) hydrogels are prepared by a patterning process, and they exhibit a broad and uniform distribution of mesopores, which is conducive to ion transport with an excellent specific capacitance (223.52 F g –1 at 0.5 A g –1 ). A ZIC is subsequently constructed by utilizing Ti 3 C 2 T X @PANI-RGO as the anode and DRGO as the cathode, which displays an extensive operating voltage (0–3.0 V), promin...