Study of Methanol‐tolerant Oxygen Reduction Reaction at Pt–Bi/C Bimetallic Nanostructured Catalysts

Remona, A. Mary; Phani, K. L. N.

doi:10.1002/fuce.201000082

Cited by 19 publications

(15 citation statements)

References 38 publications

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“…PtBi is one of these bimetallic systems that have been reported to be CO tolerant 10,11 and that, at the same time, revealed higher catalytic activities for several oxidation reactions, e.g., formic acid, 12,13 methanol, 14−16 glycerol, 17 ethylene glycol, 18 and ethanol. 15,17,19,20 The enhancement on the catalytic activity has been mainly attributed to the lower poisoning of PtBi catalysts with CO.…”

Section: Introductionmentioning

confidence: 98%

Bismuth and CO Coadsorption on Platinum Nanoparticles

et al. 2014

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CO adsorption onto Pt-and Pt-based catalysts is a very relevant topic in electrocatalysis, and in particular, in fuel cells research. CO is known to be the main responsible of the poisoning of the catalysts and consequent decrease on performance of the fuel cells devices. In this paper, density functional theory (DFT) calculations and experiments were combined to access the effect of modifying Pt nanoparticles with Bi on CO adsorption. CO adsorption energies were calculated for Pt sites nearby Bi atoms in different type of structures: Pt clusters with Bi as surface adatom and Pt clusters with Bi as surface and subsurface dopant (alloys). The results show that, when compared with pure Pt, the adsorption energies for CO are lower on PtBi clusters in both adatom and surface alloy configurations. Subsurface PtBi alloys reveal higher adsorption energies for CO but these structures are energetically very unfavorable. On the basis of the calculations, a high degree of mobility of Bi on the surface was found in the presence of CO. These results suggest that the experimental differences between cyclic voltammogram before and after CO stripping can be due to a reorganization of the Bi layer on the catalyst when CO is coadsorbed. It was also experimentally observed, that CO oxidation peaks on the modified electrodes shift to higher potentials with increasing Bi coverage. These results suggest a higher effect of the decrease of CO coverages on the oxidation process than the decrease of the biding energies for Pt−CO in the presence of Bi.

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Section: Introductionmentioning

confidence: 98%

Bismuth and CO Coadsorption on Platinum Nanoparticles

et al. 2014

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“…Pt-Bi/C showed improved methanol tolerance for ORR compared to Pt/C [3]. Remona and Phani [32] synthesised PtBi/C by micro-emulsion. The PtBi/C displayed a higher methanol tolerance compared to mass activity (1.5 times higher) for ORR compared to Pt/C.…”

Section: Bimetallic-alloyed Catalystsmentioning

confidence: 99%

“…The benefit of heat treatment is the removal of impurities resulting from the preparation stages, allowing uniform dispersion and stable distribution of the catalyst on the support, thereby improving the electrocatalytic activity of the prepared catalyst. It has been determined that the electrocatalytic reduction of oxygen on the catalyst can be influenced by the particle size and surface structure, and hence treatment can have an effect on ORR activity and stability by altering the surface structure of the catalyst [32]. Various researchers have worked on heat treatment of mono and bimetallic catalysts for ORR [50].…”

Section: Bimetallic-alloyed Catalystsmentioning

confidence: 99%

Oxygen Reduction Reaction

Khotseng¹

2018

Electrocatalysts for Fuel Cells and Hydrogen Evolution - Theory to Design

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In this chapter, the oxygen reduction reaction (ORR), which is one of the most important reactions in energy conversion systems such as fuel cells, including its reaction kinetics, is presented. Recent developments in electrocatalysts for ORR in fuel cells, including low and non-Pt electrocatalysts, metal oxides, transition metal macrocycles and chalgogenides, are discussed. Understanding of the interdependence of size, shape and activity of the electrocatalysts is evaluated. The recent development of ORR electrocatalysts with novel nanostructures is also reported. The mechanism catalysed by these electrocatalysts is presented. Finally, the perspectives of future trends for ORR are discussed.

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“…Alloying with other metal(s) may endow Pt catalyst with an enhanced tolerance to poisoning intermediates 1,2 by either synergistic catalytic effect 3,4 or electronic structural effect, 5 such as PtAu, 5 PtPd, 6,7 PtRh, 8 PtBi, 9 PtFe, 10 PtPdAu, 11 PtRhNi, 12 PtSn, 13 and PtMn 14 alloy catalysts, where PtPd alloy catalyst is particularly the center of attention because alloying with Pd not only modulates d-band electronic structure of Pt, 2,15 weakening the adsorption of poisoning molecules, but also introduces co-catalytic effect, 7,16 especially in catalytically oxidizing methanol or ethanol in basic solution, in which Pd even exhibits much better electrocatalytic activity and stability than Pt. Alloying with other metal(s) may endow Pt catalyst with an enhanced tolerance to poisoning intermediates 1,2 by either synergistic catalytic effect 3,4 or electronic structural effect, 5 such as PtAu, 5 PtPd, 6,7 PtRh, 8 PtBi, 9 PtFe, 10 PtPdAu, 11 PtRhNi, 12 PtSn, 13 and PtMn 14 alloy catalysts, where PtPd alloy catalyst is particularly the center of attention because alloying with Pd not only modulates d-band electronic structure of Pt, 2,15 weakening the adsorption of poisoning molecules, but also introduces co-catalytic effect, 7,16 especially in catalytically oxidizing methanol or ethanol in basic solution, in which Pd even exhibits much better electrocatalytic activity and stability than Pt.…”

Section: Introductionmentioning

confidence: 99%

Superior electrocatalytic activity of ultrathin PtPdBi nanowires towards ethanol electrooxidation

et al. 2016

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Bimetallic catalysts, PtBi, PtPd and PdBi have been explored and may be promising candidates for nextgeneration anodic catalysts of direct alcohol fuel cells due to their enhanced catalytic activity and longterm durability. However, ternary PtPdBi alloy catalysts are rarely reported because of the synthetic difficulty in manipulating three metallic precursors. Here, ternary metallic Pt x Pd 93Àx Bi 7 alloy nanowires were prepared for systematically investigating their electrocatalytic activity towards ethanol oxidation in basic solution by cyclic voltammetric and amperometric techniques. Pt x Pd 93Àx Bi 7 alloy nanowire, whether loaded on Vulcan XC72 carbon (C) or reduced graphene oxide (RGO), has better catalytic activity than PtPd, PtBi, PdBi, Pt/C, or Pd catalyst. Nevertheless, the catalytic activity of Pt x Pd 93Àx Bi 7 closely depends on the Pt : Pd atomic ratio. Pt 55 Pd 38 Bi 7 alloy nanowire with the optimal Pt : Pd atomic ratio can produce the maximum enhancement towards ethanol electrooxidation. RGO replacing C as catalyst supporter can further improve the catalytic performance of catalyst. Pt 55 Pd 38 Bi 7 /RGO exhibits a superior catalytic performance, the mass activity of which reaches $3.60 A mg À1 , $6 times better than commercial Pt/C. View Article Online Pd 45 Pt 55 nanowire 0.95 A mg metal À1 7 58338 | RSC Adv., 2016, 6, 58336-58342 This journal is

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Study of Methanol‐tolerant Oxygen Reduction Reaction at Pt–Bi/C Bimetallic Nanostructured Catalysts

Cited by 19 publications

References 38 publications

Bismuth and CO Coadsorption on Platinum Nanoparticles

Bismuth and CO Coadsorption on Platinum Nanoparticles

Oxygen Reduction Reaction

Superior electrocatalytic activity of ultrathin PtPdBi nanowires towards ethanol electrooxidation

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