Abstract
The widespread use of low-temperature polymer electrolyte membrane fuel cells for clean energy source require significant reductions in the amount of expensive electrocatalyst Pt for the oxygen reduction reaction (ORR). Pt based binary alloys are promising materials for more active and stable electrocatalysts. In this paper, we studied Pt–Ce nanoalloy, which was prepared by hydrogen reduction techniques as ORR electrocatalysts. Among all PtCe alloy catalysts, the PtCe/C-800 ℃ shows superior ORR activity, stability and durability compared to commercial Pt/C. The results presented in this paper will provide the future perspectives to research based on Pt-RE (RE = Ce, Dy, Gd, Er, Sm, and La) alloy as an novel electrocatalyst for various electrocatalytic reactions.
Highlights
The widespread use of low-temperature polymer electrolyte membrane fuel cells for clean energy source require significant reductions in the amount of expensive electrocatalyst Pt for the oxygen reduction reaction (ORR)
It is most likely due to the CeCl3 was firstly reduced to Ce element and Ce atoms diffused into the Pt crystal to expand the lattice of Pt
After matching with the standard PDF files, we found that some of these peaks originate from Pt2Ce (PDF #17-0010), some from Pt5Ce (PDF #17-0071), but the rest peaks locate between the two standard card
Summary
The widespread use of low-temperature polymer electrolyte membrane fuel cells for clean energy source require significant reductions in the amount of expensive electrocatalyst Pt for the oxygen reduction reaction (ORR). We studied Pt–Ce nanoalloy, which was prepared by hydrogen reduction techniques as ORR electrocatalysts. The low-temperature polymer electrolyte membrane fuel cells (PEMFCs) are promising alternative devices for clean energy source. Chemical synthesis of Pt/rare-earth nanoalloy is still a real challenge, partially because of the oxophilicity of rare-earth elements. Research in this area has focused mainly on both polycrystalline and single-crystal electrodes partially. We describe method for making Pt–Ce nanoalloy electrocatalysts using hydrogen reduction technique. In order to provide insights and understanding on the structure and property of Pt–Ce nanoalloy electrocatalyst, the Pt–Ce nanoalloy samples were characterized and analyzed by several techniques, including transmission electron microscopy (TEM) with energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), inductively coupled plasma optical emission spectrometer (ICP-OES), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV) and chronoamperometry (CA)
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