Lu Ziyi, Xiang Yin, Li Hanyu, Li Bailin, Liu Liming, Liu Shantang
Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemistry and Environmental Engineering, State Key Laboratory of Green and Efficient Development of Phosphorus Resources, Wuhan Institute of Technology, Wuhan 430073, China.
Langmuir. 2025 Jul 29;41(29):19194-19203. doi: 10.1021/acs.langmuir.5c01552. Epub 2025 Jul 15.
Aqueous Zn-based electrochromic energy storage devices (ZEESDs) integrating electrochromism and energy storage functions are considered promising candidates in next-generation advanced energy-saving smart windows or displays. However, their practical applications are severely hindered by the unsatisfactory performances. Herein, we report a high-performance aqueous ZEESD utilizing tunable Nb-doped WO as the electrochromic material/cathode, a metal Zn sheet as the anode, and 1 M ZnSO aqueous solution as the electrolyte. The electrochromic performances of the Nb-doped WO thin film with different Ar/O flow rates, doping ratios, and film thicknesses fabricated by magnetron sputtering were systematically investigated. The results show that optimal Nb-doped WO exhibits outstanding electrochromic performances including a large optical modulation (93.10% at 633 nm), a fast spectral response time (4/5 s at 633 nm), a high coloration efficiency of 75.02 cm C, and superior cycling stability (remaining 80% of the initial optical modulation after 2000 cycles). Furthermore, it also achieves a high discharge areal capacity of 100 mAh m, presenting a good energy storage capability. The assembled aqueous ZEESD based on Nb-doped WO displays a fascinating practical application prospect. This work provides a simple and effective design strategy for ZEESDs, which plays an important role for boosting the practical development in the field of energy savings and energy storage.
集成电致变色和能量存储功能的水系锌基电致变色储能器件（ZEESD）被认为是下一代先进节能智能窗户或显示器的有前途的候选者。然而，其实际应用受到性能不尽人意的严重阻碍。在此，我们报道了一种高性能水系ZEESD，它利用可调谐的铌掺杂氧化钨作为电致变色材料/阴极，金属锌片作为阳极，以及1 M硫酸锌水溶液作为电解质。系统研究了通过磁控溅射制备的不同氩气/氧气流量、掺杂比和膜厚的铌掺杂氧化钨薄膜的电致变色性能。结果表明，最佳的铌掺杂氧化钨表现出优异的电致变色性能，包括大的光学调制（633 nm处为93.10%）、快速的光谱响应时间（633 nm处为4/5 s）、75.02 cm²/C的高着色效率以及优异的循环稳定性（2000次循环后仍保持初始光学调制的80%）。此外，它还实现了100 mAh/m²的高放电面积容量，展现出良好的储能能力。基于铌掺杂氧化钨组装的水系ZEESD显示出迷人的实际应用前景。这项工作为ZEESD提供了一种简单有效的设计策略，对推动节能和储能领域的实际发展具有重要作用。
