Chemical durability using synergystic mitigation strategies
View Patent ↗A fuel cell includes an ion conducting membrane having a first side and a second side. Characteristically, the ion conducting membrane has a sufficient amount of a stabilization agent and platinum to inhibit the loss of fluoride from the ion conducting membrane when compared to an ion conducting membrane having the same construction except for the presence of cerium ions.
1. A method of making a membrane electrode assembly, the method comprising:
a) placing a cathode layer over a first side of an ion conducting membrane such that the cathode layer contacts a portion of the ion conducting membrane, the cathode layer including a stabilization agent that is diffusible into the ion conducting membrane and the ion conducting membrane includes platinum or a platinum-containing compound or alloy; the stabilization agent comprising a compound selected from the group consisting of Ce(III) containing compounds, Mn(II) containing compounds, and combinations thereof; and
b) placing an anode layer over a second side of the ion conducting membrane wherein the ion conducting membrane comprises a first ion conducting membrane proximate to the anode and a second ion conducting membrane proximate to the cathode, a concentration of platinum in the second ion conducting membrane being higher than a concentration of platinum in the first ion conducting membrane.
2. The method of claim 1 wherein the anode layer independently includes the stabilization agent.
3. The method of claim 1 wherein the ion conducting membrane includes platinum particles.
4. The method of claim 1 wherein the ion conducting membrane include platinum nanoparticles.
5. The method of claim 1 wherein the ion conducting membrane has a platinum coverage from about 1 μg/cm 2 to about 30 μg/cm 2 .
6. The method of claim 1 wherein the ion conducting membrane has a cerium ion coverage from about 0.05 μm/cm 2 to about 100 μg/cm 2 .
7. The method of claim 1 wherein the ion conducting membrane includes a perfluorinated sulfonic acid polymer.