Abstract
The Pt monolayer-shell Pd nanowires/nanorods-core (PtML/PdNW(PdNR)) electrocatalysts, supported on carbon nanoparticles are notable for their very high activity and stable performance towards the oxygen reduction reaction (ORR). In the present work Pd nanostructures are electrochemically deposited on oxidized carbon (COX) surface and the impact of the deposition parameters on the deposits morphology is studied. The electrochemical deposition of Pd nanowires is demonstrated for the first time, and a viable mechanism for the growth of Pd nanostructures is proposed. The one-dimensional growth of the Pd nanowires is ascribed to the hydrogen-underpotential-mediated layer-by-layer deposition of Pd. In addition, the surface structure of deposited nanowires is composed predominantly of {111}-oriented facets that facilitate the enhanced ORR activity and stability of the PtML/PdNW/COX electrocatalysts. The Pt mass and specific activities of these electrocatalysts, as well as their stable performance under potential cycling conditions, are significantly higher than those of the commercial Pt/C electrocatalysts, and highlight their great potential for resolving the remaining obstacles to commercializing PEMFCs.
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