A Brief Status of Flexible Bi-functional Energy Storage Electrochromic Devices

There is no wonder that flexible electronics can be considered as a boon for mankind because of its inherent characteristics of portability, stretchability, bendability, and wearability which makes it an ideal vehicle for a plethora of biomedical applications. Flexible electronic device, often integrated for wearable electronics and energy storage electrochromic device, (ESED) is a snowballed research area. This review focuses on the development of flexible ESED where charging and discharging of energy storage device is coupled with decoloration and coloration of an electrochromic device. The strategy behind the integration of energy storage and electrochromic device as a bi-functional device is discussed in length. The essential key parameters for fabrication of flexible ESED and the performance parameters of the flexible ESED have been highlighted. A quantitative analysis of flexible ESED fabricated using different materials has been presented while dwelling into details of possible materials candidates and challenges encountered so far with a possible direction of future research. Enveloping the major research developments in the field of flexible ESED while addressing the possible challenges, a future outlook in the mentioned research thrust have been presented.