resumo
This paper reports the characterization of a Nafion (R)/bacterial cellulose (BC) nanocomposite prepared by impregnation of a nanofibrillar BC membrane with Nafion (R). Such nanocomposite membrane is obtained crack-free and with thickness close to 100 mu m. Dynamic mechanical analysis reveals a storage modulus more than 1 order of magnitude higher than for pure Nafion (R), with BC effectively limiting the viscous flow of the nanocomposite up to 125 degrees C. The in-plane protonic conductivity is 0.14S cm(-1) at 94 degrees C and 98% relative humidity, which is lower than for pure Nafion (R), but in line with the lower concentration of acid groups of the composite (0.60 vs. 0.92 mmol [H+] g(-1) for Nafion (R)). The application of the Nafion (R)/BC membrane in an air/hydrogen fuel cell is demonstrated. (C) 2016 Elsevier B.V. All rights reserved.
palavras-chave
BACTERIAL CELLULOSE MEMBRANES; FUEL-CELL APPLICATIONS; PROTONIC CONDUCTIVITY; COMPOSITE MEMBRANES; THERMAL-STABILITY; BIOPOLYMER; BEHAVIOR
categoria
Agriculture
autores
Gadim, TDO; Vilela, C; Loureiro, FJA; Silvestre, AJD; Freire, CSR; Figueiredo, FML
nossos autores
Armando Jorge Domingues Silvestre
Professor Catedrático
Carla Vilela
Professor Auxiliar
Carmen Sofia da Rocha Freire Barros
Investigador Coordenador
Filipe Miguel H Lebre R Figueiredo
Investigador Principal
Francisco José Almeida Loureiro
Bolseiro de investigação
Tiago Gadim
Bolseiro de investigaçãoGrupos
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
G4 - Materiais Renováveis e Economia Circular
Projectos
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013)
Bacterial Cellulose Membranes for Proton Exchange Fuel Cells (EXPL/CTM-ENE/0548/2012)
agradecimentos
This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement, CelFuelCel (EXPL/CTM-ENE/0548/2012), HyPEM (PTDC/CTM-CER/109843/2009). The Portuguese Foundation for Science and Technology (FCT) is also acknowledged for a post-doctoral grant (SFRH/BPD/84168/2012) to Carla Vilela, contract under Investigador FCT 2012 (IF/01407/2012) to Carmen S. R. Freire and contract under Investigador FCT 2013 (IF/01174/2013) to Filipe M. L. Figueiredo. Thermal Analysis Laboratory was funded by FEDER Funds through Programa Operacional Factores de Competitividade-COMPETE and by National Funds through FCT under the project REEQ/515/CTM/2005.