Multicolor Transparent‐Conductive‐Electrode Free Electronic Paper based on Steel Foil and Water Electrolyte with pH Indicator Dyes.

Electronic paper devices, also known as electrochromic devices, are known for their ability to change color and remain in a particular color state even after the electric power is turned off. Traditional devices such as electrochromic windows use mechanisms such as electrophoresis or intercalation and use special materials such as anhydrous electrolytes and transparent conductive materials (TCMs). As a result, these devices can sometimes be relatively difficult to assemble, especially in developing countries where such materials are difficult to obtain. Recently, some improvements are made by using alternative electrode positioning that do not require TCM. Here, a novel multicolor display module that is recyclable, can be fabricated from readily available materials, and can be scaled according to the desired screen size is presented. The presented device is a semi‐open electrochemical device that uses pH indicator dyes and an aqueous electrolyte solution in combination with readily available stainless steel sheet. [ABSTRACT FROM AUTHOR]