Dealloyed PdAg core Pt monolayer shell electrocatalyst for oxygen reduction reaction
| Autor: | Yuan-Yuan Feng, Hai-Fang Yang, Li-Xia Du, Zeng-Hua Liu, De-Sheng Kong |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Nanostructure General Chemical Engineering Shell (structure) Nanoparticle Nanotechnology 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences 0104 chemical sciences Catalysis Core (optical fiber) Chemical engineering Monolayer Oxygen reduction reaction 0210 nano-technology |
| Zdroj: | RSC Advances. 6:16904-16910 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c6ra01926a |
| Popis: | A core–shell nanostructure (Pt–PdAg/C–D) with dealloyed PdAg nanoparticles (PdAg/C–D) as the core and a Pt monolayer as the shell is prepared and employed as an electrocatalyst toward oxygen reduction reaction (ORR). Compared with its counterpart alloyed PdAg core-Pt monolayer shell catalyst (Pt–PdAg/C), the Pt–PdAg/C–D catalyst shows significantly higher catalytic activities for ORR. The half wave potential (E1/2) on Pt–PdAg/C–D is located at −0.17 V, which is comparable to that on the commercial Pt/C catalyst and ca. 30 mV more positive than that on Pt–PdAg/C. The MSA of Pt in Pt–PdAg/C–D is 171.8 A gPd+Pt−1, which is 3.2 and 2.4 times higher than those of Pt–PdAg/C and commercial Pt/C catalysts, respectively. The Pt monolayer shell on the surface of the nanoparticles would induce much higher utilization of Pt atoms, and the dealloying process would result in a nanostructured PdAg core with a rough surface and a Pt shell with a numbers of low-coordinated atoms. It is concluded that the change in the electronic and geometric structure of Pt in the Pt–PdAg/C–D catalyst may contribute to the increase in catalytic performance for ORR. |
| Databáze: | OpenAIRE |
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