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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Investigation of the structural properties of poly(ethylene oxide) copolymer as gel polymer electrolyte and durability test in dye-sensitized solar cells

Texto completo
Autor(es):
Benedetti, Joo E. [1] ; Freitas, Flavio S. [1] ; Fernandes, Felipe C. [1] ; Goncalves, Agnaldo S. [1] ; Magalhes, Alvicler [1] ; Nogueira, Ana F. [1]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Campinas UNICAMP, Inst Chem, BR-13083970 Campinas, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: IONICS; v. 21, n. 6, p. 1771-1780, JUN 2015.
Citações Web of Science: 10
Resumo

We investigated the structural and thermal properties of a gel polymer electrolyte prepared with poly(ethylene oxide-co-2-(2-methoxyethoxy)ethyl glycidyl ether) (P(EO/EM) matrix, gamma-butyrolactone (GBL), and LiI/I-2. Nuclear magnetic resonance spectroscopy measurements were carried out in different temperatures for the aforementioned electrolyte composition in order to understand the interaction between the components of the gel. Within the studied temperature range, the overall Li ion mobility depends on the contribution of the Li ion mobility in GBL molecules and in the polymer matrix. Small angle X-ray scattering (SAXS) measurements of the gel electrolyte indicated an order periodicity of 7-8 nm, which provides evidence for an effective miscibility of GBL and P(EO/EM), since no structural changes were observed by SAXS data (the systems are stable within the studied temperature range). Indeed, this result corroborates Nuclear Magnetic Resonance Spectroscopy (NMR) data, since at room temperature, it is not possible to distinguish magnetic interactions between P(EO-EM) and GBL molecules, indicating the existence of a single phase. Thermogravimetric analysis shows that the gel electrolyte meets thermal stability requirements for application in photoelectrochemical devices. The performance of dye-sensitized solar cells (DSSC) based on this polymer electrolyte with different GBL concentrations was monitored for 30 days. Device with electrolyte containing 30 wt.% of GBL gave the most promising durability results in this study; the performance of this device decreased by less than 10 % in the course of 30 days. (AU)

Processo FAPESP: 11/50933-8 - Avaliação da tecnologia e aplicação de células solares de TiO2/corante
Beneficiário:Agnaldo de Souza Gonçalves
Linha de fomento: Auxílio à Pesquisa - Pesquisa Inovativa em Pequenas Empresas - PIPE
Processo FAPESP: 08/51001-9 - Células solares híbridas e fotoeletroquímicas baseadas em nanopartículas e nanorods de ZnO e ZnO:Ga
Beneficiário:Agnaldo de Souza Gonçalves
Linha de fomento: Bolsas no Brasil - Pós-Doutorado