Increasing Stability and Activity of Core–Shell Catalysts by Preferential Segregation of Oxide on Edges and Vertexes: Oxygen Reduction on Ti–Au@Pt/C

Hu, Jue; Wu, Lijun; Kuttiyiel, Kurian A.; Goodman, Kenneth R.; Zhang, Chengxu; Zhu, Yimei; Vukmirovic, Miomir B.; White, Michael G.; Sasaki, Kotaro; Adžić, Radoslav R.

doi:10.1021/jacs.6b04999

Cited by 85 publications

(56 citation statements)

References 53 publications

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“…For example, (100) facets show good ORR activity for the formation of OH − in base conditions, but the other facets prefer to form H 2 O 2 , while the (111) facets are the least active . Au is more considered as an additive to stabilize Pt catalysts in ORR . In OER, Au could further boost the activities of metal oxides via the electron‐attracting effect .…”

Section: Summary Of the Activitiesmentioning

confidence: 99%

Surface Oxidation of AuNi Heterodimers to Achieve High Activities toward Hydrogen/Oxygen Evolution and Oxygen Reduction Reactions

Liao

et al. 2018

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Although much attention has been paid to the exploration of highly active electrocatalysts, especially catalysts for hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), the development of multifunctional catalysts remains a challenge. Here, we utilize AuNi heterodimers as the starting materials to achieve high activities toward HER, OER and ORR. The HER and ORR activities in an alkali environment are similar to those of Pt catalysts, and the OER activity is very high and better than that of commercial IrO . Both the experimental and calculated results suggest that the surface oxidation under oxidative conditions is the main reason for the different activities. The NiO/Ni interface which exists in the as-synthesized heterodimers contributes to high HER activity, the Ni(OH) -Ni-Au interface and the surface Ni(OH) obtained in electrochemical conditons gives rise to promising ORR and OER activities, respectively. As a comparison, a Au@Ni core-shell structure is also synthesized and examined. The core-shell structure shows lower activities for HER and OER than the heterodimers, and reduces O selectively to H O . The work here allows for the development of a method to design multifunctional catalysts via the partial oxidation of a metal surface to create different active centers.

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Section: Summary Of the Activitiesmentioning

confidence: 99%

Surface Oxidation of AuNi Heterodimers to Achieve High Activities toward Hydrogen/Oxygen Evolution and Oxygen Reduction Reactions

Liao

et al. 2018

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“…The typical example is that the deposition of Pt monolayer on metal NPs for ORR studies using the underpotential deposition (UPD) method . By a UPD method, a Cu monolayer was coated over the Pd NPs.…”

Section: Ultrathin Pt‐based Multimetallic 0d Catalystsmentioning

confidence: 99%

“…However, Au atoms are easy to segregate onto the Pt surface during the electrochemical activation due to the lower surface energy of Au than Pt. Through the introduction of protective titanium oxide located in the highly active/distorted edge and vertex sites of Au NPs recently has been realized to solve this problem . The Au–Ti/Pt core/shell catalyst ( Figure a) has high ORR mass and specific activities, about 13 and 5 times higher than those of commercial Pt/C (Figure b).…”

Section: Ultrathin Pt‐based Multimetallic 0d Catalystsmentioning

confidence: 99%

“…b) Comparison of specific activities and mass activities at 0.9 V for Ti–Au/Pt and commercial Pt/C. c) ORR polarization curves and (inset) corresponding cyclic voltammograms of Ti–Au/Pt catalyst before and after 10 000 potential cycles between 0.6 and 1.0 V. Reproduced with permission . Copyright 2016, American Chemical Society.…”

Section: Ultrathin Pt‐based Multimetallic 0d Catalystsmentioning

confidence: 99%

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Design of Ultrathin Pt‐Based Multimetallic Nanostructures for Efficient Oxygen Reduction Electrocatalysis

Lai

Guo

2017

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Nanocatalysts with high platinum (Pt) utilization efficiency are attracting extensive attention for oxygen reduction reactions (ORR) conducted at the cathode of fuel cells. Ultrathin Pt-based multimetallic nanostructures show obvious advantages in accelerating the sluggish cathodic ORR due to their ultrahigh Pt utilization efficiency. A focus on recent important developments is provided in using wet chemistry techniques for making/tuning the multimetallic nanostructures with high Pt utilization efficiency for boosting ORR activity and durability. First, new synthetic methods for multimetallic core/shell nanoparticles with ultrathin shell sizes for achieving highly efficient ORR catalysts are reviewed. To obtain better ORR activity and stability, multimetallic nanowires or nanosheets with well-defined structure and surface are further highlighted. Furthermore, ultrathin Pt-based multimetallic nanoframes that feature 3D molecularly accessible surfaces for achieving more efficient ORR catalysis are discussed. Finally, the remaining challenges and outlooks for the future will be provided for this promising research field.

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“…[19][20] For example, Au has been used as a support for Pd or Pt monolayer (ML) catalysts [21][22] or as the core in core-shell catalysts such as Au-PtNi and Au-PtCo. [23][24] Au modified Pt nanoparticles or Pt(775) single crystal surface also exhibited large improvements in durability without lowering the activity. [4,25] In the study herein, we report new findings of the action of high surface coverage Au as the structural and electronic modifier in a ternary Au/Pd 3 Fe electrocatalyst.…”

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confidence: 99%

Balancing Activity and Stability in a Ternary Au‐Pd/Fe Electrocatalyst for ORR with High Surface Coverages of Au

Yang

et al. 2019

ChemCatChem

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Sluggish kinetics of the oxygen reduction reaction (ORR) and low durability of ORR catalysts in polymer electrolyte membrane fuel cells (PEM‐FCs) requires a continued search for advanced catalysts. Bimetallic catalysts demonstrate enhanced kinetics due to the optimized electronic properties from alloying but can suffer from poor stability of the active metals. Herein we report our findings that while bulk gold is catalytically inactive, high coverages (> 0.6 monolayer) of Au deposited on a Pd3Fe(111) surface were highly active and stable. These properties of Au‐modified Pd3Fe(111) surfaces are associated with initial formation of 2D nanostructures at step edges and the transition of 2D to 3D nanostructures under reaction conditions. The balancing of activity and stability in this ternary Au‐Pd/Fe electrocatalyst provides a potential candidate for non‐Pt, highly stable ORR catalysts. Similar nanostructures and conditions may be able to activate gold for use in other electrocatalytic reactions.

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Increasing Stability and Activity of Core–Shell Catalysts by Preferential Segregation of Oxide on Edges and Vertexes: Oxygen Reduction on Ti–Au@Pt/C

Cited by 85 publications

References 53 publications

Surface Oxidation of AuNi Heterodimers to Achieve High Activities toward Hydrogen/Oxygen Evolution and Oxygen Reduction Reactions

Surface Oxidation of AuNi Heterodimers to Achieve High Activities toward Hydrogen/Oxygen Evolution and Oxygen Reduction Reactions

Design of Ultrathin Pt‐Based Multimetallic Nanostructures for Efficient Oxygen Reduction Electrocatalysis

Balancing Activity and Stability in a Ternary Au‐Pd/Fe Electrocatalyst for ORR with High Surface Coverages of Au

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