College of Chemical and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin 132022, China.
Molecules. 2023 Mar 14;28(6):2634. doi: 10.3390/molecules28062634.
The key challenge in the practical application of electrochromic energy storage devices (EESDs) is the fabrication of high-performance electrode materials. Herein, we deposited K[La(HO)(α-PWO)] (PWLa) onto TiO nanowires (NW) to construct an NW-PWLa nanocomposite using a layer-by-layer self-assembly method. In contrast to the pure PWLa films, the nanocomposite exhibits enhanced electrochromic and electrochemical performance owing to the 3D sea-cucumber-like microstructure. An EESD using the NW-PWLa film as the cathode exhibited outstanding electrochromic and energy storage properties, with high optical modulation (48.6% at 605 nm), high switching speeds (t = 15 s, t = 4 s), and high area capacitance (5.72 mF cm at 0.15 mA cm). The device can reversibly switch between transparent and dark blue during the charge/discharge process, indicating that electrochromic contrast can be used as a quantitative indicator of the energy storage status.
电致变色储能器件（EESD）实际应用的关键挑战在于高性能电极材料的制备。在此，我们采用层层自组装法将 K[La(HO)(α-PWO)]（PWLa）沉积到 TiO 纳米线（NW）上，构建了 NW-PWLa 纳米复合材料。与纯 PWLa 薄膜相比，由于具有 3D 海胆状微观结构，纳米复合材料表现出增强的电致变色和电化学性能。作为阴极的 NW-PWLa 薄膜的 EESD 表现出出色的电致变色和储能性能，具有高光学调制（605nm 时为 48.6%）、快速开关速度（t = 15s，t = 4s）和高面积电容（0.15mA cm 时为 5.72mF cm）。该器件在充放电过程中可以在透明和深蓝色之间可逆切换，表明电致变色对比度可用作储能状态的定量指标。
