Abstract
Proton Exchange Membrane Fuel Cells (PEMFCs) are promising energy conversion devices due to their high energy density, low operating temperature, high efficiency, and ultimate cleanness—no carbon dioxide emission. Yet, a critical factor which significantly influences the performance of PEMFC is the stability of platinum group metal catalysts, which consists of Pt or Pt-alloy nanoparticles (2–5 nm in diameter) supported on the surface of carbon particles (40–100 nm in diameter) during fuel cell cycling. In fact, the Pt or Pt-alloy catalysts typically dissolve and/or grow in size with the number of cycles. In order to reveal the degradation mechanisms of these nanocatalysts , we have developed an experimental setup which replicates on a TEM grid the effect of voltage cycling on the cathode of an MEA. Using this approach, it is possible to track the behavior of a single nanoparticle at different stages of voltage cycling at the nano/atomic scale. Through these direct observations, we demonstrated that due to carbon corrosion the defects appear at the carbon/nanoparticle interface, which in turn result in particle migration and consequently coalescence. We also revealed the mass transfer mechanisms during the coalescence of nanoparticles. In addition, we revisited the commonly held view on the mechanism of particle dissolution and deposition. Thus, during the later stages of cycling, when the concentration of dissoluble Pt reaches a critical amount, single atoms and atomic clusters appear on the carbon support, which consequently move toward other particles and re-deposit on their surface. Furthermore, we investigated the atomic surface evolution of Pt-Ni nanoparticles under the effect of voltage through advanced spectroscopy technique such as EDS.
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Rasouli, S., Ferreira, P.J. (2019). Understanding the Stability of Nanoscale Catalysts in PEM Fuel Cells by Identical Location TEM. In: Nakashima, N. (eds) Nanocarbons for Energy Conversion: Supramolecular Approaches. Nanostructure Science and Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-92917-0_5
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