Novel Strategy for Preparation of Graphene-Pd, Pt Composite, and Its Enhanced Electrocatalytic Activity for Alcohol Oxidation

Abstract

As advanced electrodes for direct alcohol fuel cells, graphene-Pd and graphene-Pt composites with a trace of SnO(2) have been successfully synthesized by a modified electroless plating technique. The surface of graphene oxide is first sensitized by Sn(2+) ions, and subsequently, Pd or Pt nanoparticles are deposited on the surface of graphene oxide. Finally, graphene oxide was reduced to graphene by further adding NaBH(4). Compared to other carbon-(e.g., Vulcan XC-72R) supported Pd and Pt, the resultant graphene-Pd and Pt composites exhibit better electrocatalytic activity and long-term stability toward alcohol electrooxidation. Additionally, a trace amount of SnO(2) formed around active catalysts may also be beneficial to the enhancement of electrochemical activity.

Facile Synthesis of Bimetallic Pt-Ag/Graphene Composite and Its Electro-Photo-Synergistic Catalytic Properties for Methanol Oxidation

“…The peaks located at 71.08 and 74.38 eV for Pt-Ag/GNs and at 71.38 and 74.79 eV for Pt/GNs can be assigned to the binding energies of Pt 4f 7/2 and Pt 4f 5/2 , respectively. Their values are in line with that of platinum in the zero-valent state, which further verifies the formation of Pt (0) nanoparticles in Pt/GNs and Pt-Ag/GNs composites [14]. However, the binding energy of Pt 4f for Pt-Ag/GNs is significantly lower than that for Pt/GNs.…”

“…Figure 4B shows Pt 4f spectra of Pt/GNs (curve a) and Pt-Ag/GNs (curve b [14]. However, the binding energy of Pt 4f for Pt-Ag/GNs is significantly lower than that for Pt/GNs.…”

“…The unique properties of graphene nanosheets (GNs), such as larger specific surface areas, excellent optical transmittance, high chemical and thermal stability, and outstanding electrical conductibility, make it a superior support material for Pt-based catalysts [14,15]. Referring to our previously reported catalysts, such as Pt/SnO2/GNs [16] and Pt/TiO2/GNs [17], it is known that GNs can not only improve the dispersion of Pt nanoparticles, but also can act as the acceptor and the transfer body of the photo-electron, giving rise to charge transfer and separation efficiency of the photo-generated electron-hole pairs which leads to a better photocatalytic activity.…”

Enhanced methanol oxidation and oxygen reduction reactions on palladium-decorated FeCo@Fe/C core–shell nanocatalysts in alkaline medium

“…The slope of the plot ranged between 0.931 and 1.103 indicating that the reaction order is approximately unity, irrespective of potential. FeCo@Fe@Pd/C shows enhanced catalytic activities for MOR compared to many literature reports [44][45][46][47][48][49][50][51][52][53] as shown in ) showed a lower J f /J b ratio (2.60) indicative of a less active MOR in the anodic path compared to FeCo@Fe@Pd/C. Also, interestingly, despite that the loading of the Pd nanoflowers 52 is about 400 times higher than seen for FeCo@Fe@Pd/C, its J f /J b ratio (B5) is comparable with that of FeCo@Fe@Pd/C.…”

Recent Nanoarchitectures in Metal Nanoparticle-Graphene Nanocomposite Modified Electrodes for Electroanalysis

“…43 For preparing similar Pd-Pt bimetallic NPs, another anchoring with Sn 2+ was also reported. 44 Chen et al reported a synthetic method of Pt-Pd bimetallic nanocubes on RGO using N,N-dimethylformamide (DMF) as a bifunctional solvent for the reductions of both GO and metal ions and for confining the growth of Pt-Pd nanocubes on the surface. 10 By using the Pt-Pd bimetallic nanocube-RGO, nonenzymatic sensing of glucose at neutral pH was explored, and the performances were compared with the previous results obtained using seven different modified electrodes.…”