The effect of interfacial layer (SnO_x) on the performance of the complementary electrochromic devices (ECDs) was examined, revealing that the SnO_x/WO₃ bilayer cathodes could enhance the electrochromic performance, such as a superior long-term cycling stability over 10,000 cycles, a high coloration efficiency of 101.61 cm² C⁻¹ and a maximum transmittance modulation of 49.27%@633 nm. Moreover, compared with the single layer WO₃, the SnO_x/WO₃ bilayer exhibited improved electrochemical activities and reaction kinetics. The probable explanation is that the introduced interfacial layer can boost the double injection of ions and electrons, balance the transport of ions and electrons, and protect the electrode from degradation by serving as a buffer layer during coloration/bleaching cycles. These results further provide a valuable insight for improving the electrochromic properties of the films instead of relying on conventional methods such as nanostructural or compositional control.

检查了界面层 (SnO _x ) 对互补电致变色器件 (ECD) 性能的影响，表明 SnO _x /WO ₃双层阴极可以增强电致变色性能，例如超过 10,000 次的优异长期循环稳定性循环，101.61 cm ²  C ^-1的高着色效率和 49.27%@633 nm 的最大透射率调制。此外，与单层WO ₃相比，SnO _x /WO ₃双层表现出改善的电化学活性和反应动力学。可能的解释是，引入的界面层可以促进离子和电子的双重注入，平衡离子和电子的传输，并通过在着色/漂白循环期间充当缓冲层来保护电极免受降解。这些结果进一步为改善薄膜的电致变色性能提供了宝贵的见解，而不是依赖于传统的方法，如纳米结构或成分控制。