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A PBI‐Sb 0.2 Sn 0.8 P 2 O 7 ‐H 3 PO 4 Composite Membrane for Intermediate Temperature Fuel Cells
Author(s) -
Wu X.,
Mamlouk M.,
Scott K.
Publication year - 2011
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201100089
Subject(s) - membrane , analytical chemistry (journal) , conductivity , materials science , nuclear chemistry , crystallography , chemistry , chromatography , biochemistry
Fine particles of a solid proton conductor Sb 0.2 Sn 0.8 P 2 O 7 were incorporated in PBI‐H 3 PO 4 membranes with 20 wt.%. In SEM figures, the Sb 0.2 Sn 0.8 P 2 O 7 particles exhibited even and uniform distribution in the PBI‐Sb 0.2 Sn 0.8 P 2 O 7 membrane. Influences of the immersing time and the concentration of H 3 PO 4 solution for immersion on H 3 PO 4 loading level were investigated. H 3 PO 4 loading level was found an important factor on membrane conductivity. Incorporation of Sb 0.2 Sn 0.8 P 2 O 7 in the PBI‐H 3 PO 4 membrane resulted in greater membrane conductivities. In the single cell tests, the peak power density of the membrane electrode assembly (MEA) with the PBI‐Sb 0.2 Sn 0.8 P 2 O 7 ‐H 3 PO 4 membrane was also greater than that of a MEA with PBI‐H 3 PO 4 membrane. One MEA using PBI‐Sb 0.2 Sn 0.8 P 2 O 7 ‐H 3 PO 4 membrane achieved a peak power density of 0.67 W cm –2 at 175 °C with H 2 /O 2 and exhibited satisfactory stability.