Journal
RSC ADVANCES
Volume 6, Issue 87, Pages 84334-84341Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra19155j
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Funding
- Basic Science Research Program through National Research Foundation of Korea (NRF) - Ministry of Education [2014R1A1A2054826]
- National Research Foundation of Korea [2014R1A1A2054826] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Reduced graphene oxide (rGO)-supported asymmetric Au-core Pd-shell bimetallic nanoparticles (AuPd/rGO), i.e. Pd2+ is reduced only on the exposed Au(0) nanoparticle (GN) surface, were prepared using a simple two-step synthetic approach. First, negatively charged similar to 15 nm GNs were prepared and attached to the amine-functionalized positive surface of a glass slide. Second, the substrate of the adsorbed Au-core nanoparticles was added to the Pd precursor solutions (0.5, 5, and 10 mM of PdCl2, respectively), resulting in the deposition of a thin asymmetric Pd layer on the surface of the GNs via a tailored galvanic replacement reaction (GRR). This led to more sophisticated structures such as asymmetric core-shell nanoparticles, while avoiding monometallic nanoparticle formation. The compositional/structural features were characterized by high-resolution transmission electron microscopy, scanning TEM, UV-Vis spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The catalytic activity of AuPd/rGO was investigated by rotating disk electrode voltammetry in 0.1 M NaOH. In particular, AuPd/ rGO with a Au : Pd wt% ratio of 0.61 : 0.39 showed superior oxygen reduction reaction (ORR) activity along with satisfactory stability under alkaline conditions.
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