The development of core-shell structures remains a fundamental challenge for pure metallic aerogels. Here we report the synthesis of PdxAu-Pt core-shell aerogels comprised of an ultrathin Pt shell and a composition-tunable PdxAu alloy core. The universality of this strategy ensures the extension of core compositions to Pd-transition metal alloys. The core-shell aerogels exhibited largely improved Pt utilization efficiency for oxygen reduction reaction and their activities show a volcano-type relationship as a function of the lattice parameter of the core substrate. The maximum mass and specific activities are 5.25 A mg-1Pt and 2.53 mA cm-2, which are 18.7 and 4.1 times higher than those of Pt/C, respectively, demonstrating the superiority of the core-shell metallic aerogels. The proposed core-based activity descriptor provides a new possible strategy for the design of future core-shell electrocatalysts.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:33354 |
| Date | 28 February 2019 |
| Creators | Cai, Bin, Hübner, Rene, Sasaki, Kotaro, Zhang, Yuanzhe, Su, Dong, Ziegler, Christoph, Vukmirovic, Miomir, Rellinghaus, Bernd, Adzic, Radoslav, Eychmüller, Alexander |
| Publisher | Wiley-VCH Verlag GmbH & Co KGaA |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/acceptedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 10.1002/anie.201710997, 1521-3773, 10.1002/anie.201710997 |
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