Pt–Au/nitrogen-doped graphene nanocomposites for enhanced electrochemical activities

Abstract

A facile in situ assembly strategy was developed for the fabrication of Pt-Au alloy nanoparticles (NPs) on nitrogen-doped graphene (N-G) sheets, and the as-fabricated Pt-Au/N-G nanocomposites were suitable for electrochemical applications. As characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction analysis and inductively coupled plasma-atomic emission spectroscopy techniques, Pt-Au alloy NPs with an average size of 4-5 nm were uniformly distributed on the N-G surface through intrinsic covalent bonds. The Pt-Au/N-G nanocomposites exhibited excellent electrocatalytic activity and stability towards the methanol oxidation reaction with the highest capability observed for a Pt/Au atomic ratio of 3/1. The unique electrochemical features are distinctive from those of N-free nanocomposites and commercially available Pt/C catalysts, indicative of the alloying effect of Pt-Au and their synergistic interaction with the N-G sheet, which may open up new possibilities for the preparation of N-G-based nanocomposites for other intensive applications as well.

Nitrogen-Doped Carbon Nanotube and Graphene Materials for Oxygen Reduction Reactions

“…Moreover, nitrogen doping could introduce active sites for catalytic reactions and also act as anchoring sites for metal nanoparticle deposition. Yang et al fabricated a composite of Pt-Au alloy nanoparticles on NG sheets by a wet-chemistry method [127]. As shown in Figure 7, the NG was synthesized by thermal treatment of GO powder and melamine.…”

Biocomposites Made from Bovine Bone and Crystals of Silver and Platinum

“…The Pt nanoparticles exhibit an average size of 2.2 ± 0.6 nm. Figure 11.10a shows a single platinum nanoparticle exhibiting 2.25Å lattice fringes corresponding to the (111) planes of a face-centered cubic structure [17]. …”

Cuprous oxide/nitrogen-doped graphene nanocomposites as electrochemical sensors for ofloxacin determination

“…Studies have indicated that nitrogen-doped graphene has a larger area and shows an enhanced electronic activity [9][10][11] . In addition, nitrogen-doped graphene is a good carrier of other guest molecules or materials, which may provide the nanomaterial new characteristics [12] . Meanwhile, Cu 2 O is an important p-type semiconductor with a band gap of 2.17 eV, and has been widely used in solar energy conversion [13] , photocatalytic degradation [14] , and electrochemical sensing [15] .…”