Oxygen reduction reaction activity of Pd-based bimetallic electrocatalysts in alkaline medium
| Autor: | Georgios Bampos, Symeon Bebelis, Labrini Sygellou |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Chemistry
Alloy 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences Catalysis 0104 chemical sciences Lattice strain X-ray photoelectron spectroscopy engineering Oxygen reduction reaction 0210 nano-technology Bimetallic strip Nuclear chemistry |
| Zdroj: | Catalysis Today. 355:685-697 |
| ISSN: | 0920-5861 |
| Popis: | A series of 10 wt.% Pd-M (M: Ag, Ca, Co, Cu, Fe, Ni, Sn, Zn) / C electrocatalysts, with Pd to M mass ratio equal to 3:1, were prepared via the wet impregnation method, physicochemically characterized employing various techniques (BET, XRD, TEM, XPS) and electrochemically characterized towards their ORR activity in 0.1 M KOH solution using the RDE technique. Presence of alloy formations was revealed in the bulk of the Pd-Zn and Pd-Sn electrocatalysts. The highest ORR activity was exhibited by the Pd-Cu electrocatalyst, surpassing the activity of the 10 wt.% Pt/C reference. Specific ORR activity higher than that of 10 wt.% Pt/C was also exhibited, in descending order, by the Pd-Zn, Pd-Sn and Pd-Ni electrocatalysts. 10 wt.% Pd/C reference electrocatalyst exhibited the lowest ORR activity among all the tested samples. The superior ORR activity of the Pd-Cu electrocatalyst was mainly associated with an optimum Pd lattice strain. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect