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Characterisation of zirconium and titanium phosphates and direct methanol fuel cell (DMFC) performance of functionally graded Nafion(R) composite membranes prepared out of them

Titelangaben

Bauer, Felix ; Willert-Porada, Monika:
Characterisation of zirconium and titanium phosphates and direct methanol fuel cell (DMFC) performance of functionally graded Nafion(R) composite membranes prepared out of them.
In: Journal of Power Sources. Bd. 145 (August 2005) Heft 2 . - S. 101-107.
ISSN 0378-7753
DOI: https://doi.org/10.1016/j.jpowsour.2005.01.063

Volltext

Link zum Volltext (externe URL): Volltext

Abstract

Pure layered phosphates of varying crystalline phases and crystallinity and composites of gradient layers of zirconium phosphate in Nafion 117-membranes have been prepared. The proton conductivity and, in case of the composites, also the dynamic mechanical properties of these materials were measured under different conditions of temperature and humidity. Membrane-electrode assemblies with low platinum catalyst loading of 0.4 mg cm−2 Pt at the cathode and 1.9 mg cm−2 Pt–Ru at the anode were examined in a direct methanol fuel cell (DMFC) at medium temperatures (130 °C). The conductivity of the layered zirconium phosphates is superior to the titanium phosphates and increases with decreasing crystallite size. The electrical performance of the composites in a DMFC-environment is slightly decreased as compared to the unmodified membrane but taking the reduced methanol crossover into account, higher efficiencies can be reached with the zirconium phosphate modified membrane. Furthermore, the mechanical properties are significantly improved by the presence of the inorganic compound.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: Direct methanol fuel cell; Layer phosphate; Proton conductivity; Dynamic mechanical analysis; Composite membrane
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Werkstoffverarbeitung
Fakultäten
Fakultäten > Fakultät für Ingenieurwissenschaften
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 13 Feb 2015 16:19
Letzte Änderung: 04 Mai 2015 12:47
URI: https://eref.uni-bayreuth.de/id/eprint/6736