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| Hauptseite > Publikationsdatenbank > Shape Stability of Octahedral PtNi Nanocatalysts for Electrochemical Oxygen Reduction Reaction Studied by in situ Transmission Electron Microscopy > print |
| Hauptseite > Publikationsdatenbank > Shape Stability of Octahedral PtNi Nanocatalysts for Electrochemical Oxygen Reduction Reaction Studied by in situ Transmission Electron Microscopy > print |
| 001 | 858797 | ||
| 005 | 20240610120405.0 | ||
| 024 | 7 | _ | |a 10.1021/acsnano.7b09202 |2 doi |
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| 100 | 1 | _ | |a Gocyla, Martin |0 P:(DE-Juel1)161464 |b 0 |
| 245 | _ | _ | |a Shape Stability of Octahedral PtNi Nanocatalysts for Electrochemical Oxygen Reduction Reaction Studied by in situ Transmission Electron Microscopy |
| 260 | _ | _ | |a Washington, DC |c 2018 |b Soc. |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a Octahedral faceted nanoparticles are highly attractive fuel cell catalysts as a result of their activity for the oxygen reduction reaction (ORR). However, their surface compositional and morphological stability currently limits their long-term performance in real membrane electrode assemblies. Here, we perform in situ heating of compositionally segregated PtNi1.5 octahedral nanoparticles inside a transmission electron microscope, in order to study their compositional and morphological changes. The starting PtNi1.5 octahedra have Pt-rich edges and concave Ni-rich {111} facets. We reveal a morphological evolution sequence, which involves transformation from concave octahedra to particles with atomically flat {100} and {111} facets, ideally representing truncated octahedra or cuboctahedra. The flat {100} and {111} facets are thought to comprise a thin Pt layer with a Ni-rich subsurface, which may boost catalytic activity. However, the transformation to truncated octahedra/cuboctahedra also decreases the area of the highly active {111} facets. The morphological and surface compositional evolution, therefore, results in a compromise between catalytic activity and morphological stability. Our findings are important for the design of more stable faceted PtNi nanoparticles with high activities for the ORR. |
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| 700 | 1 | _ | |a Shviro, Meital |0 P:(DE-Juel1)165174 |b 2 |
| 700 | 1 | _ | |a Heyen, Henner |0 P:(DE-HGF)0 |b 3 |
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| 700 | 1 | _ | |a Heggen, Marc |0 P:(DE-Juel1)130695 |b 6 |e Corresponding author |
| 700 | 1 | _ | |a Strasser, Peter |0 0000-0002-3884-436X |b 7 |
| 773 | _ | _ | |a 10.1021/acsnano.7b09202 |g Vol. 12, no. 6, p. 5306 - 5311 |0 PERI:(DE-600)2383064-5 |n 6 |p 5306 - 5311 |t ACS nano |v 12 |y 2018 |x 1936-086X |
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