Enhancing Oxygen Reduction Reaction Activity via Pd−Au Alloy Sublayer Mediation of Pt Monolayer Electrocatalysts

Xing, Yangchuan; Cai, Yun; Vukmirovic, Miomir B.; Zhou, Weiping; Karan, Hiroko I.; Wang, Jia X.; Adžić, Radoslav R.

doi:10.1021/jz101297r

Cited by 155 publications

(132 citation statements)

References 39 publications

(70 reference statements)

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“…Higher electrocatalytic properties from Pt-alloys as well other noble metals-alloys over Pt, have been related with different phenomena broadly classified as: i) structural, ii) electronic and iii) surface sensitive factors [8,9]. For example, different studies have revealed that modifying the M 1 eM 2 distance through lattice contraction or expansion due to alloying effect, may decrease the OH adsorption energy on Pt-alloy increasing ORR activity [10,11]. However, it is necessary to mention that both geometric and electronic effects are intimately entrenched, thus, separating these effects and assessing their relative importance in the electrocatalytic activity and reaction mechanism, is rather difficult.…”

Section: Introductionmentioning

confidence: 99%

Enhanced electroactivity for the oxygen reduction on Ni@Pt core-shell nanocatalysts

Godínez-Salomón

Hallen‐Lopez²,

Solorza‐Feria

2012

International Journal of Hydrogen Energy

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Section: Introductionmentioning

confidence: 99%

Enhanced electroactivity for the oxygen reduction on Ni@Pt core-shell nanocatalysts

Godínez-Salomón

Hallen‐Lopez²,

Solorza‐Feria

2012

International Journal of Hydrogen Energy

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“…Therefore, improved, lowcost ORR electrocatalysts with high activity, and increased potential for commercialization, can be obtained based on this approach. [38]. The above example evidently demonstrated the meditation effect of the interlayer for the interaction between Pt monolayer and the metal core.…”

Section: Addition Of An Interlayer Between the Ptmentioning

confidence: 72%

Platinum Monolayer Electrocatalysts for the Oxygen Reduction Reaction: Improvements Induced by Surface and Subsurface Modifications of Cores

Cai

Adžić

2011

Advances in Physical Chemistry

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This paper demonstrates that the ORR activity of Pt ML electrocatalysts can be further improved by the modification of surface and subsurface of the core materials. The removal of surface low-coordination sites, generation (via addition or segregation) of an interlayer between Pt ML and the core, or the introduction of a second metal component to the subsurface layer of the core can further improve the ORR activity and/or stability of Pt ML electrocatalysts. These modifications generate the alternation of the interactions between the substrate and the Pt ML , involving the changes on both electronic (ligand) and geometric (strain) properties of the substrates. The improvements resulted from the application of these approaches provide a new perspective to designing of the new generation Pt ML electrocatalysts.

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“…In another example, Tao et al [312] modified a Cu-UPD process by carefully preparing a UPD solution containing Cu, CuSO 4 and AA to allow the process to be free of potential control, resulting in 1~2 nm Pt nanoclusters being deposited onto Pd nanorods. Adzic et al [289] also performed the Cu-UPD twice to deposit double shells consisting of an outmost monolayer shell of Pt and a monolayer subshell of PdAu onto a Pd core.…”

Section: Principles and Development Of Electrodepositionmentioning

confidence: 99%

Core–Shell-Structured Low-Platinum Electrocatalysts for Fuel Cell Applications

Wang

Luo

et al. 2018

Electrochem. Energ. Rev.

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Pt-based catalysts are the most efficient catalysts for low-temperature fuel cells. However, commercialization is impeded by prohibitively high costs and scarcity. One of the most effective strategies to reduce Pt loading is to deposit a monolayer or a few layers of Pt over other metal cores to form core-shell-structured electrocatalysts. In core-shell-structured electrocatalysts, the compositions of the core can be divided into five classes: single-precious metallic cores represented by Pd, Ru, and Au; singlenon-precious metallic cores represented by Cu, Ni, Co, and Fe; alloy cores containing 3d, 4d or 5d metals; and carbide and nitride cores. Of these, researchers have found that carbide and nitride cores can yield tremendous advantages over alloy cores in terms of cost and promotional activities of Pt shells. In addition, desirable shells with reasonable thicknesses and compositions have been recognized to play a dominant role in electrocatalytic performances. And recently, researchers have also found that the catalytic activity of core-shell-structured catalysts is dependent on the binding energy of the adsorbents, which is determined by the d-band center of Pt. The shifting of this d-band center in turn is mainly affected by strain and electronic effects, which can be adjusted by adjusting core compositions and shell thicknesses of catalysts. In the development of these core-shell structures, optimal synthesis methods are of primary concern because they directly determine the practical application potential of the resulting electrocatalysts. And in this article, the principles behind core-shell-structured low-Pt electrocatalysts and the developmental progresses of various synthesis methods along with the traits of each type of core and its effects on Pt shell catalytic activities are discussed. In addition, perspectives on this type of catalyst are discussed and future research directions are proposed.

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Enhancing Oxygen Reduction Reaction Activity via Pd−Au Alloy Sublayer Mediation of Pt Monolayer Electrocatalysts

Cited by 155 publications

References 39 publications

Enhanced electroactivity for the oxygen reduction on Ni@Pt core-shell nanocatalysts

Enhanced electroactivity for the oxygen reduction on Ni@Pt core-shell nanocatalysts

Platinum Monolayer Electrocatalysts for the Oxygen Reduction Reaction: Improvements Induced by Surface and Subsurface Modifications of Cores

Core–Shell-Structured Low-Platinum Electrocatalysts for Fuel Cell Applications

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