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Sustainable Dual-Mode Smart Windows for Energy-EfficientBuildings

Penulis : Sílvia C. Nunes [-]
Kontributor / Dosen Pembimbing :
  • Sofia M. Saraiva,Rui F. P. Pereira,So?nia Pereira,Maria Manuela Silva,Luís D. Carlos,Elvira Fortunato,Rute A. S. Ferreira,Rosa Rego,Vero?nica de Zea Bermudez
Jenis Koleksi : Jurnal elektronik
Penerbit : Kimia
Fakultas : Fakultas Matematika dan Ilmu Pengetahuan Alam
Subjek : Chemistry
Kata Kunci : ?-carrageenan polysaccharide, erbium triflate, NIR-emitting smart windows, energy-efficient glazing for buildings,window daylighting control, glare reduction, heating saving
Sumber : ACSAppl.EnergyMater.XXXX, XXX, XXX?XXX
Staf Input/Edit : Latifa Noor  
File : 1 file
Tanggal Input : 18 Mar 2019

Sustainable Dual-Mode Smart Windows for Energy-EfficientBuildingsSílvia C. Nunes,*,†,‡Sofia M. Saraiva,‡Rui F. P. Pereira,§So?nia Pereira,?Maria Manuela Silva,§Luís D. Carlos,?Elvira Fortunato,?Rute A. S. Ferreira,?Rosa Rego,‡and Vero?nica de Zea Bermudez*,‡†Chemistry Department, University of Beira Interior, 6200-001 Covilha?, Portugal‡Chemistry Department and CQ-VR, University of Tra?s-os-Montes e Alto Douro, 5000-801 Vila Real, Portugal§Chemistry Department and Chemistry Center, University of Minho, 4710-057 Braga, Portugal?CENIMAT/I3N, Departamento de Cie?ncia dos Materiais, Faculdade de Cie?ncias e Tecnologia, 2829-516 Lisboa, Portugal?Physics Department and CICECO?Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal*SSupporting InformationABSTRACT: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?-carrageenan (?-Cg)polysaccharide, glycerol (Gly), and erbium triflate (ErTrif3·xH2O) are proposed as avaluable technological solution for the development of smart windows providing lessheating demand, less glare and more indoors human comfort for the new generation ofenergy-efficient buildings. The electrolyte preparation is cheap, clean, and fast. Theoptimized sample including 50 wt% Gly/?-Cg and 40 wt% ErTrif3·xH2O/?-Cg exhibitsthe highest ionic conductivity (1.5×10?4Scm?1at 20°C) and displays ultraviolet(UV)/blue and NIR emissions associated with the?-Cg-based host and the Er3+ions(4I15/2?4I13/2), respectively. The 5-layer configuration ECD tested demonstrated fastswitching 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 cm2C?1and +3072/+2589 cm2C?1at 550/1000 nm for coloration and bleaching, respectively), excellent electrochemical stability, and self-healingafter 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)

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