Macroporous Vanadium Oxide Ion Storage Films Enable Fast Switching Speed and High Cycling Stability of Electrochromic Devices,ACS Applied Materials & Interfaces

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Macroporous Vanadium Oxide Ion Storage Films Enable Fast Switching Speed and High Cycling Stability of Electrochromic Devices
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-06-23 , DOI: 10.1021/acsami.2c05492
Wuxi Zhao ₁ , Junyi Wang _{1,

2,

3,

4} , Brian Tam ₅ , Peng Pei ₁ , Fuzhong Li ₁ , An Xie _{6,

7} , Wei Cheng _{1,

2,

3,

4}

Affiliation

Compared to the significant effort dedicated toward developing efficient electrochromic materials for the working electrodes of electrochromic (EC) devices, the attention paid to developing ion storage counter electrode materials for EC devices has been trivial. Herein, we report that a macroporous crystalline V₂O₅ film as an ion storage layer paired with a WO₃ working electrode results in an EC device with high performance. The macroporous vanadium oxide films are prepared by a simple template-free photodeposition method that allows us to tune the thickness and crystallinity of the film, thus giving access to a full EC device with optimal EC performance: short response time of about 2 s, high electrochromic cycling stability up to 10,000 times, long memory effect over 24 h, and an exceedingly high coloration efficiency of 189 cm²/C that are superior to the state-of-the-art performance of solution-processed vanadium oxide based EC devices. The extraordinary EC performance can be attributed to the macroporous structure, high crystallinity, and optimized thickness of the vanadium oxide films that boost the charge-balancing capability of the films. The easy and controllable preparation and the efficient charge-balancing capability of the macroporous vanadium oxide film make it a promising ion storage material for developing high-performance EC devices.

中文翻译：

大孔氧化钒离子存储膜实现电致变色器件的快速开关速度和高循环稳定性

与致力于开发用于电致变色 (EC) 器件工作电极的高效电致变色材料的重大努力相比，开发用于 EC 器件的离子存储对电极材料的关注微不足道。在此，我们报道了大孔结晶 V ₂ O ₅薄膜作为离子存储层与 WO _3配对工作电极产生具有高性能的 EC 装置。大孔氧化钒薄膜是通过一种简单的无模板光沉积方法制备的，该方法允许我们调整薄膜的厚度和结晶度，从而获得具有最佳 EC 性能的完整 EC 器件：约 2 s 的短响应时间，高电致变色循环稳定性高达10,000次，记忆效应超过24小时，着色效率高达189 cm ²/C 优于溶液处理的基于氧化钒的 EC 器件的最新性能。非凡的 EC 性能可归因于氧化钒薄膜的大孔结构、高结晶度和优化的厚度，从而提高了薄膜的电荷平衡能力。大孔氧化钒薄膜的简单可控制备和高效的电荷平衡能力使其成为开发高性能EC器件的有前途的离子存储材料。

更新日期：2022-06-23

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