Platinum multicubes prepared by Ni 2+ -mediated shape evolution exhibit high electrocatalytic activity for oxygen reduction
Pt(100) facets are generally considered less active for the oxygen reduction reaction (ORR). Reported herein is a unique Pt-branched structure, a multicube, whose surface is mostly enclosed by {100} facets but contains high-index facets at the small junction area between the adjacent cubic component...
| Päätekijät: | , , , , , , , |
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| Muut tekijät: | |
| Aineistotyyppi: | Journal Article |
| Kieli: | English |
| Julkaistu: |
2015
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| Aiheet: | |
| Linkit: | https://hdl.handle.net/10356/107163 http://hdl.handle.net/10220/25344 http://dx.doi.org/10.1002/anie.201500947 |
| Yhteenveto: | Pt(100) facets are generally considered less active for the oxygen reduction reaction (ORR). Reported herein is a unique Pt-branched structure, a multicube, whose surface is mostly enclosed by {100} facets but contains high-index facets at the small junction area between the adjacent cubic components. The synthesis is accomplished by a Ni2+-mediated facet evolution from high-index {311} to {100} facets on the frameworks of multipods. Despite the high {100} facet coverage, the Pt multicubes exhibit impressive ORR activity in terms of half-wave potential and current density nearly to the level of the most active Pt-based catalysts, while the durability of catalysts is well retained. The facet evolution creates a set of samples with tunable ratios of high-index to low-index facets. The results reveal that the excellent ORR performance of Pt multicubes is a combined result of active sites by high-index facets and low resistance by flat surface. It is anticipated that this work will offer a new approach to facet-controlled synthesis and ORR catalysts design. |
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