Wang Yi, Zhang Zilong, Wang Ze, Yan Yujie, Feng Tong, Xie An
Key Laboratory of Functional Materials and Applications of Fujian Province, School of Materials Science and Engineering, Xiamen University of Technology, Xiamen 361024, China.
School of Mechanical Electrical and Information Engineering, Xiamen Institute of Technology, Xiamen 361021, China.
Materials (Basel). 2025 Jun 17;18(12):2871. doi: 10.3390/ma18122871.
Electrochromic devices have garnered significant interest owing to their promising applications in smart multifunctional electrochromic energy storage systems (EESDs) and their emerging next-generation electronic technologies. Tungsten oxide (WO), possessing both electrochromic and pseudocapacitive characteristics, offers great potential for developing multifunctional devices with enhanced performance. However, achieving an efficient and straightforward synthesis of WO electrochromic films, while simultaneously ensuring high coloration efficiency and energy storage capability, remains a significant challenge. In this work, a low-temperature hydrothermal approach is employed to directly grow hexagonal-phase WO films on FTO substrates. This process utilizes sorbitol to promote nucleation and rubidium sulfate to regulate crystal growth, enabling a one-step in situ fabrication strategy. To complement the high-performance WO cathode, a composite PB/SnO film was designed as the anode, offering improved electrochromic properties and enhanced stability. The assembled EESD exhibited fast bleaching/coloration response and a high coloration efficiency of 101.2 cm C. Furthermore, it exhibited a clear and reversible change in optical properties, shifting from a transparent state to a deep blue color, with a transmittance modulation reaching 81.47%.
电致变色器件因其在智能多功能电致变色储能系统（EESD）中的应用前景以及新兴的下一代电子技术而备受关注。氧化钨（WO）兼具电致变色和赝电容特性，为开发高性能多功能器件提供了巨大潜力。然而，实现WO电致变色薄膜的高效、直接合成，同时确保高着色效率和储能能力，仍然是一项重大挑战。在这项工作中，采用低温水热法在FTO衬底上直接生长六方相WO薄膜。该过程利用山梨醇促进成核，硫酸铷调节晶体生长，实现一步原位制备策略。为了补充高性能WO阴极，设计了复合PB/SnO薄膜作为阳极，具有改善的电致变色性能和增强的稳定性。组装的EESD表现出快速的漂白/着色响应和101.2 cm C的高着色效率。此外，它表现出明显且可逆的光学性质变化，从透明状态转变为深蓝色，透过率调制达到81.47%。
