Journal
CATALYSTS
Volume 12, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/catal12050477
Keywords
polymer electrolyte membrane fuel cell; oxygen reduction reaction; carbon nanotubes; carbon nanofibers; electrocatalysts
Categories
Funding
- National Council for Science and Technology, CONACYT [FSE 245920]
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A simple and controlled chemical synthesis method was developed to produce PtNi nanoparticles supported on carbon nanotubes and carbon nanofibers. The synthesized catalyst was characterized using various techniques. The experimental results showed that the PtNi/CNT catalyst exhibited higher specific activity and slightly lower mass activity compared to the commercial catalyst in the oxygen reduction reaction (ORR) process.
To evaluate supports' effects on catalytic activity toward the oxygen reduction reaction (ORR), a simple and controlled chemical synthesis, involving the hot injection of metal precursors, was developed to produce bimetallic PtNi nanoparticles (75 wt.% Pt and 25 wt.% Ni), supported on carbon nanotubes (CNTs) and carbon nanofibers (CNFs). The synthesized electrocatalyst was characterized using X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), and scanning transmission electron microscopy (STEM). To determine the catalytic activity, an electrochemical evaluation of the synthesized catalysts in an acidic medium was performed using cyclic voltammetry (CV), CO stripping, and rotating disk electrode (RDE) tests. The presence of Pt and Ni in the nanoparticles was confirmed by EDS and XRD. Based on the STEM micrographs, the average particle size was 30 nm. Compared to the commercial Pt/C catalyst, the PtNi/CNT catalyst exhibited higher specific activity and slightly lower mass activity toward ORR in a 0.1 M HClO4 electrolyte solution.
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