Year: 2006
Type: article
Abstract: To suppress methanol crossover in direct methanol fuel cells (DMFCs), a Nafion- composite membrane was prepared by recast method. Oxygen-ion conductive powders were highly dispersed in a Nafion 117 membrane to physically block methanol crossover and/or chemically oxidize the methanol, which was confirmed by the difference in the methanol diffusion coefficient between recast Nafion and Nafion- composite membranes. Interestingly, mixing into Nafion 117 membrane largely suppressed the methanol crossover, but only slightly decreased the proton conductivity of the membrane, resulting in a large improvement in the DMFC performance. The stabilities of in 5% Nafion solution, water, and were measured using an inductively coupled plasma atomic emission spectrometer, and the electrochemical stability of in solution was obtained using cyclic voltammetry. The oxygen-ion conductivities of at temperature ranges from 80 to 400°C were also measured.
DOI: 10.1149/1.2372699
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2152255353