Abstract
Carbon-supported 7.5 wt% Pd–2.5 wt% M (M: Ag, Co, Cu, Fe, Ni, Zn) bimetallic catalysts were synthesized via wet impregnation and assessed as electrocatalysts for the oxygen reduction reaction (ORR) in acidic solution at room temperature, using the thin-film rotating disk electrode technique. Monometallic 10 wt% Pt/C and 10 wt% Pd/C catalysts, prepared via the same method, were used as reference materials. The highest activity for ORR among the tested electrocatalysts was exhibited by PdZn/C and the lowest by Pd/C and PdCu/C. The activity of the rest Pd-based electrocatalysts followed the descending order: PdNi/C > PdAg/C ≥ PdCo/C > PdFe/C. The specific activity of PdZn/C was higher than that of Pt/C (more than 3 times higher for potentials 0.35–0.5 V versus Ag/AgCl), whereas their mass activities were similar. PdNi/C and PdAg/C also exhibited higher specific activity than Pt/C for potentials lower than ca. 0.4 V versus Ag/AgCl, but their mass activity was lower. The high ORR activity of PdZn/C, which renders it a promising alternative to Pt-based cathodic electrocatalysts in PEMFCs, was associated with the presence of Pd–Zn alloy in the active phase, as revealed via XRD and TEM.
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Acknowledgements
This research was funded by the European Union (European Social Fund—ESF) and national funds through the Operational Program “Bilateral S & T Cooperation between Greece and China from 2012 to 2014” of the National Strategic Reference Framework (NSRF) through the GSRT of the Ministry of Education (Project: 12CHN269).
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Bampos, G., Bebelis, S., Kondarides, D.I. et al. Comparison of the Activity of Pd–M (M: Ag, Co, Cu, Fe, Ni, Zn) Bimetallic Electrocatalysts for Oxygen Reduction Reaction. Top Catal 60, 1260–1273 (2017). https://doi.org/10.1007/s11244-017-0795-z
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DOI: https://doi.org/10.1007/s11244-017-0795-z