Electrocatalytic oxidation of methanol: carbon-supported gold–platinum nanoparticle catalysts prepared by two-phase protocol

Bimetallic Au-Pt nanoparticles synthesized by radiolysis: Application in electro-catalysis

“…Figure 4 shows a set of CVs obtained as a function of potential scan rate in 1 M KOH with a glassy carbon electrode modified with electron beam synthesized Au-Pt alloyed NPs. By comparison 29 with the patterns observed with pure monometallic catalysts in the same medium, peak I features the oxidation of the two metals, peaks II and III the reduction of Au oxides, Pt oxides and peak IV and its counterpart the sorption-desorption pattern of hydrogen. Here again, the presence of the two metals is clearly detected.…”

“…In particular, bimetallic platinumbased catalysts have been proposed as promising alternatives to the exceedingly expensive pure Pt electrocatalysts and are already widely used in industry and for proton exchange membrane (PEM) fuel cells. 1,2 Among numerous possible metal combinations, Au-Pt NPs have been studied intensively because of their optical properties, 3 their potential as selective oxidation 4,5 and dehydrogenation catalysts, 6 electrocatalysts, 7,8,9 and selective sensors. Cationic Au-Pt clusters have shown unique reactivity for C-N coupling of methane and ammonia.…”

Pt–Au/C cathode with enhanced oxygen-reduction activity in PEFCs

“…The guidelines for designing bimetallic catalysts suggest that one of the metals in the bimetal catalyst should facilitate the splitting of O=O bond while the other should help reduce the adsorbed atomic-oxygen (Luo et al 2006). In this context, the combination of Pt and Au has been found to be superior to pristine Pt towards ORR (Elhsissen et al 1999;Devarajan et al 2005;Luo et al 2005;Njoki et al 2005;Qian et al 2006;Hernandez-Fernandez et al 2008;Wang et al 2008Wang et al , 2009Liu et al 2009a, b;Ma et al 2010). In view of the unique properties of nano-sized gold (Haruta 2005;Hughes et al 2005;Luo et al 2006) and the high catalytic-activity of Pt, bimetallic Pt-Au nanoparticles of optimum composition are highly likely to serve as synergistic catalysts.…”

A comparative theoretical study for the methanol dehydrogenation to CO over Pt3 and PtAu2 clusters

“…Pt-based catalysts are known to possess excellent catalytic activity for methanol oxidation [2][3][4][5][6][7]. However, it is well-known that pure Pt catalysts used in direct-methanol fuel cells (DMFCs) are easily poisoned by the carbonyl species generated in the electrochemical oxidation of methanol [8].…”

“…The use of bimetallic catalysts is indicated to be one of the solutions to reduce CO poisoning and improve the catalyst performance [9][10][11]. Many Ptbased bimetallic catalysts, such as PtRu [2][3][4], PtAu [5][6][7], PtCo [12], PtMo [13], and PtSn [14,15], have been found to have higher activity for the methanol dehydrogenation reaction with improved resistance to CO poisoning than pure Pt catalysts, and have been applied successfully to prototypes of commercial DMFCs. In particular, PtAu bimetallic nanoparticles, which have attracted much attention over the past twenty years [16,17], have been proposed as excellent electrocatalysts for methanol electrooxidation [5,[18][19][20][21][22][23] because Au is more stable than nonnoble metals under the DMFCs operating conditions and relatively less expensive than other noble metal materials.…”