Effect of PEM Fuel Cell Exhaust Water Conductivity on Catalyst Degradation using Thermal Degradation Resistant Polymer Membranes
Abstract
Here, energy dispersive spectroscopy, X-ray diffraction and Williamston-Hall particle size and strain characterization are used to determine the effect of solution conductivity, heating and electrical current on Proton Exchange Membrane electrocatalyst degradation and its underlying mechanism. Quartz containing polybenzimidazole polymer samples are sputter-coated with 6nm thick layers of platinum while 100 to 400 current cycles are applied. 100 cycles of 0.7mA current removes 38% of the platinum coating while also in contact with a water containing 5 vol % acetic acid. This data suggests a possible mechanism involves the transportation of quartz to the polymer surface which combines with the platinum. The interaction between quartz and platinum increases quartzs lattice strain to 1.4% and results in quartz and platinum detaching. Thermal decomposition of polymer membranes, which contain additives (such as acid side chains), could change the properties of water produced and increase its electrical conductivity thus promoting stack degradation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 28, 2019
- Accession Number
- AD1077033
Entities
People
- Theodore E. Burye