High-Performance Electrochromic Devices Based on Poly[Ni(salen)]-Type Polymer Films

• Tipo: Artigo em Revista Científica Internacional
• Data: 2016

Autores

Nunes, M (Autor) Outra; Araujo, M (Autor) Outra; Fonseca, J (Autor) Outra; C. Moura (Autor) FCUP; Hillman, R (Autor) Outra; Cristina Freire (Autor) FCUP

Revista

Título: ACS Applied Materials & Interfaces

Vol. 8

Páginas: 14231-14243

ISSN: 1944-8244

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 29 Citações

Scopus - 29 Citações

Outras Informações

ID Authenticus: P-00K-JPQ

DOI: 10.1021/acsami.6b01977

Abstract (EN): We report the application of two poly[Ni(salen)]-type electroactive polymer films as new electrochromic materials. The two films, poly[Ni(3-Mesalen)] (poly[1]) and poly[Ni(3-MesaltMe)] (poly[2]), were successfully electrodeposited onto ITO/PET flexible substrates, and their voltammetric characterization revealed that poly[1] showed similar redox profiles in LiClO4/CH3CN and LiClO4/propylene carbonate (PC), while poly[2] showed solvent-dependent electrochemical responses. Both films showed multielectrochromic behavior, exhibiting yellow, green, and russet colors according to their oxidation state, and promising electrochromic properties with high electrochemical stability in LiClO4/PC supporting electrolyte. In particular, poly[1] exhibited a very good electrochemical stability, changing color between yellow and green (lambda = 750 nm) during 9000 redox cycles, with a charge loss of 34.3%, an optical contrast of Delta T = 26.2%, and an optical density of Delta OD = 0.49, with a coloration efficiency of ? = 75.55 cm(2) C-1. On the other hand, poly[2] showed good optical contrast for the color change from green to russet (Delta T = 58.5%), although with moderate electrochemical stability. Finally, poly[1] was used to fabricate a solid-state electrochromic device using lateral configuration with two figures of merit: a simple shape (typology 1) and a butterfly shape (typology 2); typology 1 showed the best performance with optical contrast Delta T = 88.7% (at lambda = 750 nm), coloration efficiency eta = 130.4 cm(2) C-1, and charge loss of 37.0% upon 3000 redox cycles.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 13