Structure and Activity of Novel Pt Core-Shell Catalysts for the Oxygen Reduction Reaction

Ball, Sarah C.; Burton, Sarah L.; Fisher, Janet M.; O’Malley, Rachel; Tessier, Béatrice; Theobald, Brian; Thompsett, David; Zhou, Weiping; Su, Dong; Zhu, Ye; Adžić, Radoslav R.

doi:10.1149/1.3210655

Cited by 17 publications

(15 citation statements)

References 25 publications

(32 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The high activity could be attributed to the thin, uniform, and clean Pt shell. Using the proprietary method, Ball et al deposited Pt shell on Pd–Co alloy nanoparticles and achieved a Pt mass activity of 0.7 A mg –1 . , The same material, however, only showed a Pt mass activity of 0.14 A mg –1 in the fuel cell testing. Alia et al coated Pt overlayers with various thicknesses (1.1, 1.7, and 2.2 Pt MLs) on Pd nanotube by reducing Pt salts with PVP at 108.7 °C.…”

Section: Core–shell Structuresmentioning

confidence: 99%

Recent Advances in Electrocatalysts for Oxygen Reduction Reaction

et al. 2016

View full text Add to dashboard Cite

The recent advances in electrocatalysis for oxygen reduction reaction (ORR) for proton exchange membrane fuel cells (PEMFCs) are thoroughly reviewed. This comprehensive Review focuses on the low- and non-platinum electrocatalysts including advanced platinum alloys, core-shell structures, palladium-based catalysts, metal oxides and chalcogenides, carbon-based non-noble metal catalysts, and metal-free catalysts. The recent development of ORR electrocatalysts with novel structures and compositions is highlighted. The understandings of the correlation between the activity and the shape, size, composition, and synthesis method are summarized. For the carbon-based materials, their performance and stability in fuel cells and comparisons with those of platinum are documented. The research directions as well as perspectives on the further development of more active and less expensive electrocatalysts are provided.

show abstract

Section: Core–shell Structuresmentioning

confidence: 99%

Recent Advances in Electrocatalysts for Oxygen Reduction Reaction

et al. 2016

View full text Add to dashboard Cite

show abstract

“…181 Future progress in the development of these novel nanostructures would be to substantially increase their mass activity, normalised to total platinum group metal content (rather than the platinum metal content), and to prepare them using a synthesis method amenable towards industrial scale-up. 185 It is worth considering what the ideal configuration would be for a Pt-based ORR catalyst. The Pt overlayer would only be a single layer thick, would be at least as active as pure Pt, and the core would consist of a material that is abundant and inexpensive.…”

Section: Strategies To Improve the Performance Of Pt-alloy Nanoparticlesmentioning

confidence: 99%

Understanding the electrocatalysis of oxygen reduction on platinum and its alloys

Stephens

Bondarenko

Grønbjerg

et al. 2012

Energy Environ. Sci.

1,074

1,024

View full text Add to dashboard Cite

The high cost of low temperature fuel cells is to a large part dictated by the high loading of Pt required to catalyse the oxygen reduction reaction (ORR). Arguably the most viable route to decrease the Pt loading, and to hence commercialise these devices, is to improve the ORR activity of Pt by alloying it with other metals. In this perspective paper we provide an overview of the fundamentals underlying the reduction of oxygen on platinum and its alloys. We also report the ORR activity of Pt 5 La for the first time, which shows a 3.5-to 4.5-fold improvement in activity over Pt in the range 0.9 to 0.87 V, respectively. We employ angle resolved X-ray photoelectron spectroscopy and density functional theory calculations to understand the activity of Pt 5 La.

show abstract

“…16 Early examples demonstrating the importance of Pt-shell nanoparticles as active electrocatalysts for the ORR were reported by Adzic and coworkers. 14,15,18 The relationship between bimetallic nanoparticle structure and catalytic activity has been correlated to DFT calculations by a number of groups. 17,[19][20][21] Notably, Nørskov and coworkers have demonstrated trends in oxygen reduction electrocatalyst activity based on the binding energy of oxygen and other reaction intermediates to the metal surface.…”

Section: Introductionmentioning

confidence: 99%

Au@Pt dendrimer encapsulated nanoparticles as model electrocatalysts for comparison of experiment and theory

et al. 2012

View full text Add to dashboard Cite

In this paper we report the electrochemical synthesis of core@shell dendrimer-encapsulated nanoparticles (DENs) consisting of cores containing 147 Au atoms (Au 147 ) and Pt shells having $54 or $102 atoms (Au 147 @Pt n (n ¼ 54 or 102)). The significance of this work arises from the correlation of the experimentally determined structural and electrocatalytic properties of these particles with density functional theory (DFT) calculations. Specifically, we describe an experimental and theoretical study of Pb underpotential deposition (UPD) on Au 147 DENs, the structure of both Au 147 @Pb n and Au 147 @Pt n DENs, and the activity of these DENs for the oxygen reduction reaction (ORR). DFT calculations show that Pb binding is stronger on the (100) facets of Au as compared to (111), and the calculated deposition and stripping potentials are consistent with those measured experimentally. Galvanic exchange is used to replace the surface Pb atoms with Pt, and a surface distortion is found for Au 147 @Pt n particles using molecular dynamics simulations in which the Pt-covered (100) facets shear into (111) diamond structures. DFT calculations of oxygen binding show that the distorted surfaces are the most active for the ORR, and that their activity is similar regardless of the Pt coverage. These calculations are consistent with rotating ring-disk voltammetry measurements.

show abstract

Structure and Activity of Novel Pt Core-Shell Catalysts for the Oxygen Reduction Reaction

Cited by 17 publications

References 25 publications

Recent Advances in Electrocatalysts for Oxygen Reduction Reaction

Recent Advances in Electrocatalysts for Oxygen Reduction Reaction

Understanding the electrocatalysis of oxygen reduction on platinum and its alloys

Au@Pt dendrimer encapsulated nanoparticles as model electrocatalysts for comparison of experiment and theory

Contact Info

Product

Resources

About