Applied IrO<sub>2</sub> Buffer Layer as a Great Promoter on Ti-Doping V<sub>2</sub>O<sub>5</sub> Electrode to Enhance Electrochromic Device Properties
Electrochromic devices (ECDs) are a promising material for smart windows that are capable of transmittance variation. However, ECDs are still too expensive to achieve a wide market reach. Reducing fabrication cost remains a challenge. In this study, we inserted an IrO<sub>2</sub> buffer...
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MDPI AG
2022-07-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/15/5179 |
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| author | Tien-Fu Ko Po-Wen Chen Kuan-Ming Li Hong-Tsu Young |
| author_facet | Tien-Fu Ko Po-Wen Chen Kuan-Ming Li Hong-Tsu Young |
| author_sort | Tien-Fu Ko |
| collection | DOAJ |
| description | Electrochromic devices (ECDs) are a promising material for smart windows that are capable of transmittance variation. However, ECDs are still too expensive to achieve a wide market reach. Reducing fabrication cost remains a challenge. In this study, we inserted an IrO<sub>2</sub> buffer layer on Ti-doped V<sub>2</sub>O<sub>5</sub> (Ti:V<sub>2</sub>O<sub>5</sub>) as a counter electrode using various Ar/O<sub>2</sub> gas flow ratios (1/2, 1/2.5, 1/3 and 1/3.5) in the fabrication process. The buffered-ECD resulted in a larger cyclic voltammetry (CV) area and the best surface average roughness (Ra = 3.91 nm) to promote electrochromic performance. It was fabricated using the low-cost, fast deposition process of vacuum cathodic arc plasma (CAP). This study investigates the influence of the IrO<sub>2</sub> buffer/Ti:V<sub>2</sub>O<sub>5</sub> electrode on ECD electrochemical and optical properties, in terms of color efficiency (CE) and cycle durability. The buffered ECD (glass/ITO/WO<sub>3</sub>/liquid electrolyte/IrO<sub>2</sub> buffer/Ti:V<sub>2</sub>O<sub>5</sub>/ITO/glass) demonstrated excellent optical transmittance modulation; ∆T = 57% (from T<sub>bleaching</sub> (67%) to T<sub>coloring</sub> (10%)) at 633 nm, which was higher than without the buffer (ITO/WO<sub>3</sub>/liquid electrolyte/Ti:V<sub>2</sub>O<sub>5</sub>/ITO) (∆T = 36%). In addition, by means of an IrO<sub>2</sub> buffer, the ECD exhibited high coloration efficiency of 96.1 cm<sup>2</sup>/mC and good durability, which decayed by only 2% after 1000 cycles. |
| first_indexed | 2024-03-09T10:07:45Z |
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| issn | 1996-1944 |
| language | English |
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| publishDate | 2022-07-01 |
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| spelling | doaj.art-ad268eaa61cb4e22b0feccbb428b5e162023-12-01T23:00:45ZengMDPI AGMaterials1996-19442022-07-011515517910.3390/ma15155179Applied IrO<sub>2</sub> Buffer Layer as a Great Promoter on Ti-Doping V<sub>2</sub>O<sub>5</sub> Electrode to Enhance Electrochromic Device PropertiesTien-Fu Ko0Po-Wen Chen1Kuan-Ming Li2Hong-Tsu Young3Department of Mechanical Engineering, National Taiwan University, Taipei City 10617, TaiwanDivision of Physics, Institute of Nuclear Energy Research, Taoyuan City 32546, TaiwanDepartment of Mechanical Engineering, National Taiwan University, Taipei City 10617, TaiwanDepartment of Mechanical Engineering, National Taiwan University, Taipei City 10617, TaiwanElectrochromic devices (ECDs) are a promising material for smart windows that are capable of transmittance variation. However, ECDs are still too expensive to achieve a wide market reach. Reducing fabrication cost remains a challenge. In this study, we inserted an IrO<sub>2</sub> buffer layer on Ti-doped V<sub>2</sub>O<sub>5</sub> (Ti:V<sub>2</sub>O<sub>5</sub>) as a counter electrode using various Ar/O<sub>2</sub> gas flow ratios (1/2, 1/2.5, 1/3 and 1/3.5) in the fabrication process. The buffered-ECD resulted in a larger cyclic voltammetry (CV) area and the best surface average roughness (Ra = 3.91 nm) to promote electrochromic performance. It was fabricated using the low-cost, fast deposition process of vacuum cathodic arc plasma (CAP). This study investigates the influence of the IrO<sub>2</sub> buffer/Ti:V<sub>2</sub>O<sub>5</sub> electrode on ECD electrochemical and optical properties, in terms of color efficiency (CE) and cycle durability. The buffered ECD (glass/ITO/WO<sub>3</sub>/liquid electrolyte/IrO<sub>2</sub> buffer/Ti:V<sub>2</sub>O<sub>5</sub>/ITO/glass) demonstrated excellent optical transmittance modulation; ∆T = 57% (from T<sub>bleaching</sub> (67%) to T<sub>coloring</sub> (10%)) at 633 nm, which was higher than without the buffer (ITO/WO<sub>3</sub>/liquid electrolyte/Ti:V<sub>2</sub>O<sub>5</sub>/ITO) (∆T = 36%). In addition, by means of an IrO<sub>2</sub> buffer, the ECD exhibited high coloration efficiency of 96.1 cm<sup>2</sup>/mC and good durability, which decayed by only 2% after 1000 cycles.https://www.mdpi.com/1996-1944/15/15/5179iridium oxide (IrO<sub>2</sub>)buffer layerelectrochromic device (ECD)cathodic arc plasma (CAP)coloration efficiency (CE) |
| spellingShingle | Tien-Fu Ko Po-Wen Chen Kuan-Ming Li Hong-Tsu Young Applied IrO<sub>2</sub> Buffer Layer as a Great Promoter on Ti-Doping V<sub>2</sub>O<sub>5</sub> Electrode to Enhance Electrochromic Device Properties Materials iridium oxide (IrO<sub>2</sub>) buffer layer electrochromic device (ECD) cathodic arc plasma (CAP) coloration efficiency (CE) |
| title | Applied IrO<sub>2</sub> Buffer Layer as a Great Promoter on Ti-Doping V<sub>2</sub>O<sub>5</sub> Electrode to Enhance Electrochromic Device Properties |
| title_full | Applied IrO<sub>2</sub> Buffer Layer as a Great Promoter on Ti-Doping V<sub>2</sub>O<sub>5</sub> Electrode to Enhance Electrochromic Device Properties |
| title_fullStr | Applied IrO<sub>2</sub> Buffer Layer as a Great Promoter on Ti-Doping V<sub>2</sub>O<sub>5</sub> Electrode to Enhance Electrochromic Device Properties |
| title_full_unstemmed | Applied IrO<sub>2</sub> Buffer Layer as a Great Promoter on Ti-Doping V<sub>2</sub>O<sub>5</sub> Electrode to Enhance Electrochromic Device Properties |
| title_short | Applied IrO<sub>2</sub> Buffer Layer as a Great Promoter on Ti-Doping V<sub>2</sub>O<sub>5</sub> Electrode to Enhance Electrochromic Device Properties |
| title_sort | applied iro sub 2 sub buffer layer as a great promoter on ti doping v sub 2 sub o sub 5 sub electrode to enhance electrochromic device properties |
| topic | iridium oxide (IrO<sub>2</sub>) buffer layer electrochromic device (ECD) cathodic arc plasma (CAP) coloration efficiency (CE) |
| url | https://www.mdpi.com/1996-1944/15/15/5179 |
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