Addition of Multi‐walled Carbon Nanotubes to Fe‐ and Ru‐Metallopolymer Electrodes Enhances Response Time and Cycling Stability in Electrochromic Cells
Abstract Metallopolymers (MEPEs) show a strong absorption band attributed to a metal‐to‐ligand charge transfer (MLCT) transition. Fe‐MEPE and Ru‐MEPE thin films switch reversibly from blue‐purple (λmax=584 nm, Fe2+) to colorless (Fe3+) or orange (λmax=518 nm, Ru2+) to pale green (Ru3+). The addition...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley-VCH
2023-08-01
|
| Series: | ChemElectroChem |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/celc.202300178 |
| _version_ | 1797767576422449152 |
|---|---|
| author | Dr. Lukas Niklaus Dr. Marco Schott Dr. Guinevere A. Giffin |
| author_facet | Dr. Lukas Niklaus Dr. Marco Schott Dr. Guinevere A. Giffin |
| author_sort | Dr. Lukas Niklaus |
| collection | DOAJ |
| description | Abstract Metallopolymers (MEPEs) show a strong absorption band attributed to a metal‐to‐ligand charge transfer (MLCT) transition. Fe‐MEPE and Ru‐MEPE thin films switch reversibly from blue‐purple (λmax=584 nm, Fe2+) to colorless (Fe3+) or orange (λmax=518 nm, Ru2+) to pale green (Ru3+). The addition of multi‐walled carbon nanotubes (MWCNTs) enhances the electrochromic (EC) properties of Fe‐ and Ru‐MEPE electrodes in several ways: (1) faster response for bleaching/coloring; (2) enhanced Coulombic efficiency; and (3) improved cycling stability, particularly for Ru‐MEPE. Moreover, the charge density of the thin film electrodes can be increased upon the addition of the MWCNTs. This performance improvement is demonstrated in electrochromic devices (ECDs) with titanium‐doped vanadium oxide (TiVOx) as the optically‐passive ion storage layer. The visible light transmittance τv values of the ECDs are improved by the addition of the MWCNTs from 20 %/56 % to 17 %/56 % and from 31 %/47 % and 34 %/55 % in the dark/bright state, for Fe‐MEPE and Ru‐MEPE, respectively. Thus, the addition of MWCNTs to Fe‐ or Ru‐MEPE is a very promising route for future fast‐switching EC applications, e. g., displays, sunroofs, and rear‐view mirrors. |
| first_indexed | 2024-03-12T20:40:50Z |
| format | Article |
| id | doaj.art-180361be554747a3a7d5152a01718a53 |
| institution | Directory Open Access Journal |
| issn | 2196-0216 |
| language | English |
| last_indexed | 2024-03-12T20:40:50Z |
| publishDate | 2023-08-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | ChemElectroChem |
| spelling | doaj.art-180361be554747a3a7d5152a01718a532023-08-01T08:05:32ZengWiley-VCHChemElectroChem2196-02162023-08-011015n/an/a10.1002/celc.202300178Addition of Multi‐walled Carbon Nanotubes to Fe‐ and Ru‐Metallopolymer Electrodes Enhances Response Time and Cycling Stability in Electrochromic CellsDr. Lukas Niklaus0Dr. Marco Schott1Dr. Guinevere A. Giffin2Fraunhofer Institute for Silicate Research ISC Neunerplatz 2 97082 Würzburg GermanyFraunhofer Institute for Silicate Research ISC Neunerplatz 2 97082 Würzburg GermanyFraunhofer Institute for Silicate Research ISC Neunerplatz 2 97082 Würzburg GermanyAbstract Metallopolymers (MEPEs) show a strong absorption band attributed to a metal‐to‐ligand charge transfer (MLCT) transition. Fe‐MEPE and Ru‐MEPE thin films switch reversibly from blue‐purple (λmax=584 nm, Fe2+) to colorless (Fe3+) or orange (λmax=518 nm, Ru2+) to pale green (Ru3+). The addition of multi‐walled carbon nanotubes (MWCNTs) enhances the electrochromic (EC) properties of Fe‐ and Ru‐MEPE electrodes in several ways: (1) faster response for bleaching/coloring; (2) enhanced Coulombic efficiency; and (3) improved cycling stability, particularly for Ru‐MEPE. Moreover, the charge density of the thin film electrodes can be increased upon the addition of the MWCNTs. This performance improvement is demonstrated in electrochromic devices (ECDs) with titanium‐doped vanadium oxide (TiVOx) as the optically‐passive ion storage layer. The visible light transmittance τv values of the ECDs are improved by the addition of the MWCNTs from 20 %/56 % to 17 %/56 % and from 31 %/47 % and 34 %/55 % in the dark/bright state, for Fe‐MEPE and Ru‐MEPE, respectively. Thus, the addition of MWCNTs to Fe‐ or Ru‐MEPE is a very promising route for future fast‐switching EC applications, e. g., displays, sunroofs, and rear‐view mirrors.https://doi.org/10.1002/celc.202300178Electrochromic devicesmetallopolymersmulti-walled carbon nanotubesfast switchingtitanium-doped vanadium oxide |
| spellingShingle | Dr. Lukas Niklaus Dr. Marco Schott Dr. Guinevere A. Giffin Addition of Multi‐walled Carbon Nanotubes to Fe‐ and Ru‐Metallopolymer Electrodes Enhances Response Time and Cycling Stability in Electrochromic Cells ChemElectroChem Electrochromic devices metallopolymers multi-walled carbon nanotubes fast switching titanium-doped vanadium oxide |
| title | Addition of Multi‐walled Carbon Nanotubes to Fe‐ and Ru‐Metallopolymer Electrodes Enhances Response Time and Cycling Stability in Electrochromic Cells |
| title_full | Addition of Multi‐walled Carbon Nanotubes to Fe‐ and Ru‐Metallopolymer Electrodes Enhances Response Time and Cycling Stability in Electrochromic Cells |
| title_fullStr | Addition of Multi‐walled Carbon Nanotubes to Fe‐ and Ru‐Metallopolymer Electrodes Enhances Response Time and Cycling Stability in Electrochromic Cells |
| title_full_unstemmed | Addition of Multi‐walled Carbon Nanotubes to Fe‐ and Ru‐Metallopolymer Electrodes Enhances Response Time and Cycling Stability in Electrochromic Cells |
| title_short | Addition of Multi‐walled Carbon Nanotubes to Fe‐ and Ru‐Metallopolymer Electrodes Enhances Response Time and Cycling Stability in Electrochromic Cells |
| title_sort | addition of multi walled carbon nanotubes to fe and ru metallopolymer electrodes enhances response time and cycling stability in electrochromic cells |
| topic | Electrochromic devices metallopolymers multi-walled carbon nanotubes fast switching titanium-doped vanadium oxide |
| url | https://doi.org/10.1002/celc.202300178 |
| work_keys_str_mv | AT drlukasniklaus additionofmultiwalledcarbonnanotubestofeandrumetallopolymerelectrodesenhancesresponsetimeandcyclingstabilityinelectrochromiccells AT drmarcoschott additionofmultiwalledcarbonnanotubestofeandrumetallopolymerelectrodesenhancesresponsetimeandcyclingstabilityinelectrochromiccells AT drguinevereagiffin additionofmultiwalledcarbonnanotubestofeandrumetallopolymerelectrodesenhancesresponsetimeandcyclingstabilityinelectrochromiccells |