| Full text | |
| Author(s): |
da Silva, Jaqueline S.
[1]
;
Carvalho, Sabrina G. M.
[1]
;
da Silva, Rodrigo P.
[1]
;
Tavares, Ana C.
[2]
;
Schade, Ulrich
[3]
;
Puskar, Ljiljana
[3]
;
Fonseca, Fabio C.
[1]
;
Matos, Bruno R.
[1]
Total Authors: 8
|
| Affiliation: | [1] IPEN CNEN SP, Inst Pesquisas Energet & Nucl, BR-05508000 Sao Paulo - Brazil
[2] Inst Natl Rech Sci, Energie Mat & Telecommun INRS EMT, 1650 Blvd Lionel Boulet, Varennes, PQ J3X 1S2 - Canada
[3] Helmholtz Zentrum Mat & Energie GmbH, Methoden Mat Twicklung, D-12489 Berlin - Germany
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | Physical Chemistry Chemical Physics; v. 22, n. 24, p. 13764-13779, JUN 28 2020. |
| Web of Science Citations: | 3 |
| Abstract | |
At present, small angle X-ray scattering (SAXS) studies of perfluorinated sulfonic-acid ionomers (PFSAs) are unable to fully determine the true shape of their building blocks, as recent SAXS modelling predicts disk- and rod-like nanoionic domains as being equally possible. This scenario requires evidence-based findings to unravel the real shape of PFSA building blocks. Herein, a SAXS pattern signature for a lamellar nanophase separation of the ionic domains of Nafion is presented, backed by mid and far infrared spectroscopy (MIR and FIR) and wide angle X-ray scattering (WAXS) data of Nafion in different ionic forms, a broad range of ionic phase contents (EW similar to 859-42 252 g eq(-1)) and temperatures. The study indicates that the lamellar arrangement of the ionic domains is the most representative morphology that accounts for the physical properties of this ionomer. The lamellar SAXS reflections of Nafion are enhanced in electric and magnetic field-aligned membranes, as confirmed by atomic force microscopy (AFM). Electric and magnetic field-assisted casting of Nafion allowed producing nanostructured and anisotropic films with the lamellas stacked perpendicularly to the field vector, which is the direction of interest for several applications. Such nanostructured Nafion membranes are bestowed with advanced optical and proton transport properties, making them promising materials for solar and fuel cells. (AU) | |
| FAPESP's process: | 14/09087-4 - Studies on the use of bioethanol in proton exchange membrane and solid oxide fuel cells |
| Grantee: | Marcelo Linardi |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 17/11937-4 - A sustainable path to methane conversion by advanced electrochemical technologies |
| Grantee: | Fabio Coral Fonseca |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |
| FAPESP's process: | 14/50279-4 - Brasil Research Centre for Gas Innovation |
| Grantee: | Julio Romano Meneghini |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |
| FAPESP's process: | 13/50151-5 - Development of composite electrolytes containing inorganic particles of high proton conductivity for direct ethanol fuel cells |
| Grantee: | Bruno Ribeiro de Matos |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |