Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/73094
Título: | Sustainable dual-mode smart windows for energy-efficient buildings |
Autor(es): | Nunes, Silvia C. Saraiva, Sofia M. Pereira, Rui Francisco Gonçalves Pinto Fernandes Pereira, Sonia Silva, Maria Manuela Carlos, Luis D. Fortunato, Elvira Ferreira, Rute A. S. Rego, Rosa Bermudez, Veronica de Zea |
Palavras-chave: | kappa-carrageenan polysaccharide erbium triflate NIR-emitting smart windows energy-efficient glazing for buildings window daylighting control glare reduction heating saving κ-carrageenan polysaccharide |
Data: | 2019 |
Editora: | American Chemical Society |
Revista: | ACS Applied Energy Materials |
Resumo(s): | Electrochromic devices (ECDs) combining visible/near-infrared (NIR) transparent amorphous indium zinc oxide (a-IZO) external layers with innovative NIR-emitting electrolytes composed of red seaweed-derived kappa-carrageenan (kappa-Cg) polysaccharide, glycerol (Gly), and erbium triflate (ErTrif(3)center dot xH(2)O) are proposed as a valuable technological solution for the development of smart windows providing less heating demand, less glare and more indoors human comfort for the new generation of energy-efficient buildings. The electrolyte preparation is cheap, clean, and fast. The optimized sample including 50 wt% Gly/kappa-Cg and 40 wt% ErTrif(3)center dot xH(2)O/kappa-Cg exhibits the highest ionic conductivity (1.5 X 10(-4) S cm(-1) at 20 degrees C) and displays ultraviolet (UV)/blue and NIR emissions associated with the kappa-Cg-based host and the Er3+ ions (I-4(15/2) -> I-4(13/2)), respectively. The 5-layer configuration ECD tested demonstrated fast switching time (50 s), high electrochromic contrast (transmittance variations of 46/51% at 550/1000 nm), high optical density change (0.89/0.75 at 550/1000 nm), outstanding coloration efficiency (450th cycle = -15902/-13400 cm(2) C-1 and +3072/+2589 cm(2) C-1 at 550/1000 nm for coloration and bleaching, respectively), excellent electrochemical stability, and self-healing after mechanical damage. The ECD encompasses two voltage-operated modes: semibright warm (+3.0 V, transmittances of 52/61% at 550/1000 nm) and dark cold (-3.0 V, transmittances of 7/11% at 550/1000 nm). |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/73094 |
DOI: | 10.1021/acsaem.8b02041 |
ISSN: | 2574-0962 |
Versão da editora: | https://pubs.acs.org/doi/10.1021/acsaem.8b02041 |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | CDQuim - Artigos (Papers) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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ACS Applied Energy Materials (Repositório).pdf Acesso restrito! | 890,2 kB | Adobe PDF | Ver/Abrir | |
SI S. C. Nunes et al, ACS Applied Energy Materials, (Repositório).pdf Acesso restrito! | 572,45 kB | Adobe PDF | Ver/Abrir |