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

Title data

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. Vol. 145 (2005) Issue 2 . - pp. 101-107.
ISSN 0378-7753
DOI: https://doi.org/10.1016/j.jpowsour.2005.01.063

Official URL:

Abstract in another language

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.

Further data

Item Type:	Article in a journal
Refereed:	Yes
Keywords:	Direct methanol fuel cell; Layer phosphate; Proton conductivity; Dynamic mechanical analysis; Composite membrane
Institutions of the University:	Faculties Faculties > Faculty of Engineering Science Faculties > Faculty of Engineering Science > Chair Electrochemical Process Engineering Faculties > Faculty of Engineering Science > Former Professors > Chair Electrochemical Process Engineering - Univ.-Prof. Dr. Monika Willert-Porada Faculties > Faculty of Engineering Science > Former Professors
Result of work at the UBT:	Yes
DDC Subjects:	500 Science > 500 Natural sciences 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited:	13 Feb 2015 16:19
Last Modified:	13 Jul 2022 09:04
URI:	https://eref.uni-bayreuth.de/id/eprint/6736