材料科学
MXenes公司
假电容
超级电容器
电致变色
普鲁士蓝
堆积
化学工程
纳米技术
多金属氧酸盐
电极
电化学
化学
有机化学
物理化学
工程类
催化作用
生物化学
作者
Dewei Chu,Xiaoshu Qu,Shuying ZHANG,Zhi Liu,Jilong Wang,Lin Zhou,Bihong Fu,Hua Jin,Yanyan Yang
标识
DOI:10.1016/j.mtchem.2023.101561
摘要
MXenes (2D transition metal carbides, nitrides, and carbonitrides) are attractive pseudocapacitive electrode materials for electrochemical energy conversion and storage applications. The layered structure of MXenes provides intercalation pseudocapacitance properties and numerous reaction sites; however, nanosheet agglomeration and stacking reduce the reaction site availability and limit the electrochemical reaction dynamics of the interlayer ions. In this study, a unique electrochromic-energy storage hybrid film (NW/P2W17Ni/Ti3C2Tx), based on a Ni mono-substituted Dawson-type polyoxometalate (P2W17Ni) and a 2D transition metal carbide (Ti3C2Tx), was produced by the combination of a hydrothermal process and layer-by-layer self-assembly method. With positively charged polyelectrolyte polyetherimide (PEI) as a linker, negatively charged Ti3C2Tx layered sheets and P2W17Ni polyanions were deposited on a TiO2 nanowire (NW) array to form a 3D porous structure which prevented the stacking of nanoparticles and sheets, provided more ion transmission paths, and enhanced the ion transfer kinetics. The NW/P2W17Ni/Ti3C2Tx hybrid film demonstrated elevenfold higher areal capacitance (16.1 mF cm−2, 0.6 mA cm−2) than a pure Ti3C2Tx film (1.4 mF cm−2, 0.6 mA cm−2), and the retention rate reached 100% after 1000 cycles. The asymmetric electrochromic supercapacitor (ECSC) assembled with the NW/P2W17Ni/Ti3C2Tx film as the cathode exhibited a high capacity with significant dual-band regulation in the visible and near-infrared regions. The ECSC illuminated a light-emitting diode and achieved high-speed color switching between olive green and dark azure blue during the charging and discharging processes, demonstrating the energy storage status. These results could lead to considerable advances in the development of MXene-based ECSCs.
科研通智能强力驱动
Strongly Powered by AbleSci AI