Reversible Electrochemical Mirror Devices: A Quasi‐Solid‐State Tristate Reversible Electrochemical Mirror Device with Enhanced Stability (Adv. Sci. 13/2020)

Present challenges in electrochromic devices include the limited transmissive and reflective inter‐switchability, while achieving high optical contrast, fast switching speed, and cycling stability, simultaneously. In article number 1903198, Pooi See Lee and co‐workers develop a quasi‐solid‐state tristate reversible electrochemical mirror device, which offers highly reversible switching between transparent, greyish‐blue, and mirror (reflective) optical states. The alloying approach facilitates the electrodeposition and dissolution of Cu mirror film, allowing enhanced device stability. [Image: see text]