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RESEARCH PRODUCT
Pd–M/C (M = Pd, Cu, Pt) Electrocatalysts for Oxygen Reduction Reaction in Alkaline Medium: Correlating the Electronic Structure with Activity
Marcus Vinicius CastegnaroJonder MoraisBenjamin BalkeWaldemir J. PaschoalinoMauro Roberto FernandesMaria Do Carmo Martins AlvesEdson A. Ticianellisubject
Absorption spectroscopyChemistryInorganic chemistryNanoparticle02 engineering and technologySurfaces and Interfaces010402 general chemistry021001 nanoscience & nanotechnologyCondensed Matter PhysicsElectrochemistry01 natural sciences0104 chemical sciencesX-ray photoelectron spectroscopyTransmission electron microscopyElectrochemistryGeneral Materials ScienceCyclic voltammetry0210 nano-technologyPolarization (electrochemistry)Bimetallic stripSpectroscopydescription
The increasing global needs for clean and renewable energy have fostered the design of new and highly efficient materials for fuel cells applications. In this work, Pd-M (M = Pd, Cu, Pt) and Pt nanoparticles were prepared by a green synthesis method. The carbon-supported nanoparticles were evaluated as electrocatalysts for the oxygen reduction reaction (ORR) in alkaline medium. A comprehensive electronic and structural characterization of these materials was achieved using X-ray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy. Their electrochemical properties were investigated by cyclic voltammetry, while their activities for the ORR were characterized using steady-state polarization experiments. The results revealed that the bimetallic nanoparticles consist of highly crystalline nanoalloys with size around 5 nm, in which the charge transfer involving Pd and M atoms affects the activity of the electrocatalysts. Additionally, the samples with higher ORR activity are those whose d-band center is closer to the Fermi level.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-03-06 | Langmuir |