Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4989351 | Journal of Membrane Science | 2017 | 8 Pages |
Abstract
Ceria nanoparticles were added to PBI membranes as free-radical scavengers to minimize the degradation of the polymer bulk. The 7 nm Ceria nanoparticles were synthesized by combustion synthesis and the crystal structure was characterized by X-ray powder diffraction (XRD) and TEM. The oxidative degradation of PBI and PBI-CeO2 membranes was studied under the Fenton test conditions by the weight loss, FTIR and XPS. It was revealed that adding CeO2 as free-radical scavengers greatly improved the chemical stability of the membrane and the degradation occurred at the carbon atom of the benzene ring resulting in the hydrolysis of the C-N/CN bonds. Besides, ex-situ membrane characterization and in-situ durability test revealed that PBI-CeO2-2% membrane exhibited excellent mechanical properties and high proton conductivity of 0.048 S cmâ1 at 150 °C and the MEA remained stable during 250 h stability test under a constant current discharge of 200 mA cmâ2. A conclusion is made that PBI membranes blended with a free radical scavenger is a promising approach to enhance the chemical stability for high temperature PEMFC application.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Jinkai Hao, Yongyi Jiang, Xueqiang Gao, Feng Xie, Zhigang Shao, Baolian Yi,