Characterization of GDL for Water Transport in PEMFC Cathode

Autor:	Sirivatch Shimpalee, Masato Ohashi, John W. Van Zee, Michael J. Martinez, Cui Tong
Rok vydání:	2009
Předmět:	Materials science Water transport Chemical engineering law Fuel cells Proton exchange membrane fuel cell Porous medium Layer (electronics) Cathode law.invention Catalysis Characterization (materials science)
Zdroj:	ECS Transactions. 25:357-367
ISSN:	1938-6737 1938-5862
DOI:	10.1149/1.3210586
Popis:	Several techniques were used to characterize carbon cloth and carbon paper gas diffusion media (GDM). A technique for measuring the MacMullin number is described. This number provides the missing data to test the applicability of the commonly used Bruggeman equation. Analysis of the data show that only carbon cloth GDM follow the Bruggeman equation and that carbon paper GDM have a different relationship with porosity. Data obtained by using intrusion porosimetry (IP) and the method of standard porosimetry (MSP) for the hydrophilic and hydrophobic pore size distributions (PSD) is presented. The use of multiple working fluids to access hydrophilic and hydrophobic pores is discussed as well as limitations associated with structural changes of the GDM during the tests. Scanning electron microscopic (SEM) images are also presented to illustrate differences in structures. Finally, characteristics of the GDM are incorporated into a mass transport model in order to describe water phase distribution.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6951f898be3a67cf6c920ab2819975b1 https://doi.org/10.1149/1.3210586 Zobrazit plný text záznamu