具有集成柔性、多色和长寿命的新型普鲁士白@MnO2 基无机电致变色储能器件,ACS Applied Materials & Interfaces

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具有集成柔性、多色和长寿命的新型普鲁士白@MnO2 基无机电致变色储能器件
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-10-21 , DOI: 10.1021/acsami.2c12484
Yilin Ding ₁ , Mengying Wang ₁ , Zheyue Mei ₁ , Xungang Diao ₁

Affiliation

近年来，柔性电致变色器件因其在智能多功能电致变色储能器件和可穿戴智能电子产品方面的巨大潜力而备受关注。_{在此，我们通过结合普鲁士白@MnO 2}复合电极（PWM）和溅射制备的WO ₃电极，展示了一种无机柔性锂基电致变色储能器件（EESD）。普鲁士白与MnO _{2的协同作用}对 EESD 的储能和电致变色性能都有积极的作用。其能级可以通过透射光谱和色度差来量化，通过特殊波长的光调制可以实时监测其充放电过程。具体来说，EESD 可以承受 10,000 次循环伏安循环而在宽电压窗口（-2 至 2.5 V）下没有明显退化，并在 510 nm 处以 35% 的光调制实现高着色效率（77.6 cm ^{2 /C）。}在储能性能方面，EESD 表现出出色的体积能量/功率密度（1.25 W cm ^–3 /13.2 mWh cm ^–3) 和卓越的稳定性，在超过 4000 次循环后具有接近 98.3% 的电容保持率和 99.4% 的库仑效率。它的充电和放电程度可以在不同的光谱区域进行可视化。在蓝光区（450-480 nm）充电时透射率变化为 40%，在红光区（620-750 nm）放电时透射率变化为 45%。基于其多色特性，电荷状态的定量指示是通过实时色度变化与存储或释放电荷的线性相关性来实现的。～11 mC/cm ²的存储电荷容量会导致色度差ΔE值增加～11，而～7 mC/cm ²的放电容量会导致ΔE值增加～值增加 ∼4。这项工作提供了一种有效的策略来开发便携式多色集成 EESD，以实现高性能和长稳定性。

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Novel Prussian White@MnO2-Based Inorganic Electrochromic Energy Storage Devices with Integrated Flexibility, Multicolor, and Long Life

Flexible electrochromic devices have attracted considerable attention in recent years due to their great potential in smart multifunction electrochromic energy storage devices and wearable intelligent electronics. Herein, we present an inorganic flexible Li-based electrochromic energy storage device (EESD) by combining a Prussian white@MnO₂-composited electrode (PWM) and sputtering-made WO₃ electrode. The synergistic effect of Prussian white and MnO₂ plays a positive role both in energy storage and electrochromic property of the EESD. Its energy level can be quantified by the transmittance spectrum and chrominance difference, and its charging–discharging process can be monitored in real time by optical modulation at special wavelength. Specifically, the EESD can endure a 10,000 times cyclic voltammetry cycle without obvious degradation at wide voltage windows (−2 to 2.5 V) and realize a high coloration efficiency (77.6 cm²/C) with 35% optical modulation at 510 nm. In terms of energy storage performance, the EESD demonstrates excellent volumetric energy/power density (1.25 W cm^–3/13.2 mWh cm^–3) and remarkable stability with close to 98.3% capacitance retention and 99.4% coulombic efficiency after more than 4000 cycles. Its charging and discharging degree can be visualized in different spectral regions. There are 40% transmittance change for charging in the blue light region (450–480 nm) and 45% transmittance change for discharging in the red light region (620–750 nm). Based on its multicolor property, a quantitative indicator of charge state is achieved by the linear dependence of real-time chrominance change as stored or released charge. The ∼11 mC/cm² stored charge capacity can cause an ∼11 increase in chrominance difference ΔE value, while ∼7 mC/cm² discharge capacity can cause a ΔE value increase of ∼4. This work provides an efficient strategy to develop portable multicolor-integrated EESDs toward high performance and long stability.

更新日期：2022-10-21

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