Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 46, Issue 51, Pages 26005-26018Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.03.217
Keywords
Pt-Pd/C catalysts; Oxygen reduction reaction; Surface oxide-reduction synthesis; Low Pt load; HAADF-STEM
Categories
Funding
- Instituto Politecnico Nacional [20200541, SIP-2024]
- CONACyT [CB A1-S15770, 789428]
- CEMIE Oceano [249795]
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Pt-Pd/C bimetallic catalysts with low platinum contents were synthesized by surface redox reactions. The electrochemical characterizations demonstrated that the selective incorporation of Pt in low quantities on the Pd surface increased the interaction between both metals, leading to enhanced electrocatalytic activity towards the oxygen reduction reaction.
Pt-Pd/C bimetallic catalysts with low platinum contents were synthesized by surface redox reactions. In this method, hydrogen preadsorbed on the palladium surface of the parent catalyst (Pd/C) acts as a reducer of the PtCl6- species, allowing a selective deposition and closer interaction between both metals (Pt-Pd). The physicochemical study was carried out by XRD, HAADF-STEM, HRTEM, EDS, and electronic interaction between Pt-Pd was characterized by XPS. The electrochemical characterizations by CV, CO stripping, and steady-state LSV toward ORR using RDE indicate that 1%Pt-Pd/C sample exhibited the best results. The present work demonstrates that the selective incorporation of Pt in low quantities on the Pd surface increases the interaction between both metals, producing electronic interactions, synergetic effects, and an enhanced electrocatalytic activity toward the ORR. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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