Rejuvenation of Electrochromic Devices

Author:

Li Wenjie12,Zhang Xiang2ORCID,Yan Dukang3,Wang Lebin4,Sun Wenhai2,Li Zitong2,Deng Jianbo3,Zhao Jiupeng3,Li Yao2

Affiliation:

1. School of Environmental and Chemical Engineering Heilongjiang University of Science and Technology Harbin 150022 P. R. China

2. Center for Composite Materials and Structure Harbin Institute of Technology Harbin 150001 P. R. China

3. School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 P. R. China

4. School of Materials Sun Yat‐Sen University Guangzhou 510275 P. R. China

Abstract

AbstractElectrochromic devices (ECDs) are a hot pot due to their significant energy‐saving effect in green buildings. However, the ECDs suffer from degradation induced by ion trapping during cycling, which restricts their further development. Here, it is demonstrated that the electrochromic performance of the degraded ECDs can be rejuvenated by heat treatment method The release mechanism of trapped ions in films is simulated and validated using three types of ECDs. The semi‐solid‐state ECD evinces a state of near‐failure at low temperatures can regain its initial performance by heating. All‐solid‐state ECDs, including amorphous WO3 (a‐WO3 ECD) and crystalline WO3 (c‐WO3 ECD) as the electrochromic layer, can also release the trapped ions and regain the performance (97.3% and 95.5% of initial optical modulation) by annealing, regardless of the way of degradation. The research has extended the lifespan of multiple ECDs, providing significant practical value and promoting sustainable, and eco‐friendly development.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Fundamental Research Funds for the Central Universities

Publisher

Wiley

Subject

General Materials Science,General Chemistry

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