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Designing an All‐Solid‐State Tungsten Oxide Based Electrochromic Switch with a Superior Cycling Efficiency
Author(s) -
Ganesh Gayathri Prabhu T.,
Deb Biswapriya
Publication year - 2017
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201700124
Subject(s) - materials science , electrochromism , electrolyte , cyclic voltammetry , electrochromic devices , chemical engineering , fast ion conductor , electrochemistry , electrode , nanotechnology , optoelectronics , chemistry , engineering
There are ongoing efforts to integrate electrochromic device (ECD) technology with other electrochemical systems. ECDs made with safer “solid” polymer electrolytes (SPEs) are prone to performance degradations due to their high relaxation period that is detrimental to highly dynamic switching operations. Here, the fabrication of partially crystalline WO 3 based all‐solid‐state mono‐electrochrome switches is reported that shows outstanding optical and electrical stability under prolonged charge–discharge cycles. A free‐standing SPE is specially designed by dispersing LiClO 4 into polyvinyl alcohol followed by thermochemical cross‐linking of the host. Continuous switching of the device shows two primary sources of performance degradations. One is associated with the polarization affecting both working and counter electrode interfaces (SPE‐WE and SPE‐CE), and the other is due to the irreversible redox reaction caused by total charge flow in the system that exceeds the double layer charge storage capacity of the CE. The conductivity and flexibility of the electrolyte are improved by adding glycerol as the plasticizer. In the CE, a nanocrystalline porous TiO 2 buffer is used to avert the interface modifications. The performance of the switches is presented and compared using the spectro‐electrochemical and cyclic voltammetry data.