https://scholars.lib.ntu.edu.tw/handle/123456789/576165
標題: | High-performance complementary electrochromic device based on iridium oxide as a counter electrode | 作者: | Ko T.-F Chen P.-W Li K.-M Young H.-T Chang C.-T Hsu S.-C. KUAN-MING LI |
關鍵字: | Durability; Electrochemical electrodes; Electrochemical sensors; Electrochromic devices; Electrochromism; Electrolytes; Flow of gases; ITO glass; Modulation; Nickel oxide; Opacity; Optical signal processing; Substrates; Tin oxides; Coloration efficiencies; Counter electrode materials; Electro-chromic applications; Electrochemical cycling; Indium-tin-oxide glass substrates; Nickel oxides (NiO); Optical performance; Vacuum cathodic arc; Iridium compounds | 公開日期: | 2021 | 卷: | 14 | 期: | 7 | 來源出版物: | Materials | 摘要: | In complementary electrochromic devices (ECDs), nickel oxide (NiO) is generally used as a counter electrode material for enhancing the coloration efficiency. However, an NiO film as a counter electrode in ECDs is susceptible to degradation upon prolonged electrochemical cycling, which leads to an insufficient device lifetime. In this study, a type of counter electrode iridium oxide (IrO2) layer was fabricated using vacuum cathodic arc plasma (CAP). We focused on the comparison of IrO2 and NiO deposited on a 5 × 5 cm2 indium tin oxide (ITO) glass substrate with various Ar/O2 gas-flow ratios (1/2, 1/2.5, and 1/3) in series. The optical performance of IrO2-ECD (glass/ITO/WO3/liquid electrolyte/IrO2/ITO/glass) was determined by optical transmittance modulation; ?T = 50% (from Tbleaching (75%) to Tcoloring (25%)) at 633 nm was higher than that of NiO-ECD (ITO/NiO/liquid electrolyte/WO3/ITO) (?T = 32%). Apart from this, the ECD device demonstrated a fast coloring time of 4.8 s, a bleaching time of 1.5 s, and good cycling durability, which remained at 50% transmittance modulation even after 1000 cycles. The fast time was associated with the IrO2 electrode and provided higher diffusion coefficients and a filamentary shape as an interface that facilitated the transfer of the Li ions into/out of the interface electrodes and the electrolyte. In our result of IrO2-ECD analyses, the higher optical transmittance modulation was useful for promoting electrochromic application to a cycle durability test as an alternative to NiO-ECD. ? 2021 by the authors. Licensee MDPI, Basel, Switzerland. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85103558202&doi=10.3390%2fma14071591&partnerID=40&md5=366bf617189b4d2592e0472267b43131 https://scholars.lib.ntu.edu.tw/handle/123456789/576165 |
ISSN: | 19961944 | DOI: | 10.3390/ma14071591 |
顯示於: | 機械工程學系 |
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