Tuning the Electrocatalytic Oxygen Reduction Reaction Activity and Stability of Shape-Controlled Pt-Ni Nanoparticles by Thermal Annealing - Elucidating the Surface Atomic Structural and Compositional Changes
العنوان: | Tuning the Electrocatalytic Oxygen Reduction Reaction Activity and Stability of Shape-Controlled Pt-Ni Nanoparticles by Thermal Annealing - Elucidating the Surface Atomic Structural and Compositional Changes |
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المؤلفون: | Martin Gocyla, Elliot Padgett, David A. Muller, Mikaela Goerlin, Vera Beermann, Meital Shviro, Peter Strasser, Marc Heggen, Rafal E. Dunin-Borkowski, Henrike Schmies, Stefanie Kühl, Nina Erini |
المصدر: | Journal of the American Chemical Society. 139(46) |
سنة النشر: | 2017 |
مصطلحات موضوعية: | In situ, Annealing (metallurgy), Chemistry, Alloy, Analytical chemistry, Nanoparticle, 02 engineering and technology, General Chemistry, engineering.material, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrochemistry, 01 natural sciences, Biochemistry, Catalysis, Cathode, 0104 chemical sciences, law.invention, Colloid and Surface Chemistry, Chemical engineering, law, engineering, Fourier transform infrared spectroscopy, 0210 nano-technology |
الوصف: | Shape-controlled octahedral Pt–Ni alloy nanoparticles exhibit remarkably high activities for the electroreduction of molecular oxygen (oxygen reduction reaction, ORR), which makes them fuel-cell cathode catalysts with exceptional potential. To unfold their full and optimized catalytic activity and stability, however, the nano-octahedra require post-synthesis thermal treatments, which alter the surface atomic structure and composition of the crystal facets. Here, we address and strive to elucidate the underlying surface chemical processes using a combination of ex situ analytical techniques with in situ transmission electron microscopy (TEM), in situ X-ray diffraction (XRD), and in situ electrochemical Fourier transformed infrared (FTIR) experiments. We present a robust fundamental correlation between annealing temperature and catalytic activity, where a ∼25 times higher ORR activity than for commercial Pt/C (2.7 A mgPt–1 at 0.9 VRHE) was reproducibly observed upon annealing at 300 °C. The electrochemical ... |
تدمد: | 1520-5126 |
الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e056b84bd0e9e66bb50c4adbbd502c05Test https://pubmed.ncbi.nlm.nih.gov/29019692Test |
رقم الانضمام: | edsair.doi.dedup.....e056b84bd0e9e66bb50c4adbbd502c05 |
قاعدة البيانات: | OpenAIRE |