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A study of water adsorption and desorption by a PBI-H3PO4 membrane electrode assembly by T. Gu; S. Shimpalee; J.W. Van Zee; C.-Y. Chen; C.-W. Lin is a Engineering article available to read on EtoBox.

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Data corresponding to the isotherms for the equilibrium water content of a PolyBenzImidazole (PBI)-H 3 PO 4 High Temperature Membrane Electrode Assembly (HT-MEA) are presented over a range of temperatures from 30 • C to 180 • C. The data show values for the ratio of water to acid which range from 4.0 at 70 • C to 0.2 at -160 • C at 30 kPa of water vapor pressure. In addition to the equilibrium data, rates of adsorption are shown to have time constants on the order of 500 s and 2500 s at 70 • C and 50 • C, respectively. At temperatures above 100 • C the time constants for adsorption are on the order of 100 s. These data allow for the calculation of "acid dilution" in this HT-MEA during low-temperature excursions and start up/shut down.

Who reads A study of water adsorption and desorption by a PBI-H3PO4 membrane electrode assembly?

Author

T. Gu; S. Shimpalee; J.W. Van Zee; C.-Y. Chen; C.-W. Lin

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0378-7753)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)