期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 9, 页码 5777-5782出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b00457
关键词
smart windows; TiO2; electrochromism; ion-trapping; rejuvenation
资金
- European Research Council under European Community's Seventh Framework Program/ERC Grant (GRINDOOR) [267234]
The quest for superior and low-cost electroehromic (EC) thin films, for applications in smart windows, remains strong because of their large importance for energy-efficient buildings. Although the development of new EC materials for improved devices is important, diminishing or reversing degradation is another key issue, and electrical rejuvenation of degraded EC materials can offer new opportunities. Here we demonstrate that cathodically coloring EC thin films of TiO2, which normally suffer from ion-trapping-induced degradation of charge capacity and optical modulation upon extensive electrochemical cycling, can recover their initial EC performance by a rejuvenation procedure involving Li+ ion detrapping. Thus, the initial performance can be regained, and refreshed TiO2 films exhibit the same degradation features as as-deposited films upon prolonged electrochemical cycling. The rejuvenation was carried out by using either galvanostatic or potentiostatic treatments. Our study may open avenues to explore the recovery not only of EC materials and devices based on those but also for other ion-exchange-based devices.
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