Room temperature ionic liquid (RTIL) electrolytes are excellent candidates for highly stable electrochromic (EC) devices because of their wide electrochemical windows and good environmental stability. However, the small crystal spacings and molecular gaps of conventional EC materials limit the ion-diffusion rate of RTILs’ large cations. The multiple insertions/extractions of large cations can destroy the structure of the conventional EC materials, leading to structural collapse and poor EC performance. Here, we demonstrate that metal-organic frameworks (MOFs) with large intrinsic pores in crystals are promising materials for stable and high-performance RTIL-based EC systems. The MOFs’ large intrinsic hexagonal channels provide suitable ion-transport channels for RTILs, leading to ideal electrochemical stability. We further demonstrate a patterned large-area MOF/RTIL-based EC device, suggesting the promise in future digital displays.

室温离子液体 (RTIL) 电解质因其宽的电化学窗口和良好的环境稳定性而成为高度稳定的电致变色 (EC) 器件的绝佳候选者。然而，传统EC材料的小晶体间距和分子间隙限制了RTILs大阳离子的离子扩散速率。大阳离子的多次插入/脱出会破坏传统EC材料的结构，导致结构坍塌和EC性能变差。在这里，我们证明了晶体中具有大内在孔隙的金属有机框架 (MOF) 是用于稳定和高性能基于 RTIL 的 EC 系统的有前途的材料。MOFs 的大的固有六边形通道为 RTILs 提供了合适的离子传输通道，从而实现了理想的电化学稳定性。