Journal
JOURNAL OF POWER SOURCES
Volume 365, Issue -, Pages 53-60Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.07.033
Keywords
Identical location transmission electron; microscopy; Aggregation; Pt/C nanoparticles; PEM electrolysis
Funding
- Helmholtz-Energie-Allianz Stationare elektrochemische Speicher und Wandler [HA-E-0002]
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This study investigates the influence of the hydrogen evolution reaction (HER) overpotential on the mobility of carbon-supported platinum particles. The migration of the platinum over the carbon support was analyzed by means of identical location transmission electron microscopy (IL-TEM). While at potentials of 0.1 and 0 V vs. reversible hydrogen electrode (RHE), no changes to the Pt/C material were observed. With a decrease of the overpotential to -0.1 V vs. RHE, an increase in the quantity of migrating platinum particles took place. At -0.2 V vs. RHE, a further rise in the particle migration was observed. The effect of the overpotential on the migration was explained by a higher hydrogen generation rate, the formation of a hydrogen monolayer on the platinum and the resulting changes of the platinum support distance. The mechanisms revealed in this study could describe a relevant source of degradation of PEM water electrolyzers. (C) 2017 Elsevier B.V. All rights reserved.
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