Octahedral PtCu alloy nanocrystals with high performance for oxygen reduction reaction and their enhanced stability by trace Au

Lu, Bang‐An; Sheng, Tian; Tian, Na; Zhang, Zong-Cheng; Chi, Xiao; Cao, Zhenming; Ma, Hao; Zhou, Zhi‐You; Sun, Shi‐Gang

doi:10.1016/j.nanoen.2017.01.003

Cited by 147 publications

(89 citation statements)

References 58 publications

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“…However, the sluggish kinetics for the alloy and ascribed that to the strain effect. [18] Huang et al reported a Mo-Pt 3 Ni/C with 81-fold specific activity (SA) enhancements compared with the commercial Pt/C catalyst, and they found that Mo prefers the vertex and edge sites in oxidizing conditions, which can enhance both the activity and stability of PtNi catalysts. [23] However, the Cu atoms, similar to their neighboring transition metal elements, are prone to electrochemical leaching and dissolution at anodic potential, which devastates the stability of Pt x Cu y alloy.…”

Section: Introductionmentioning

confidence: 99%

Tungsten as “Adhesive” in Pt₂CuW_0.25 Ternary Alloy for Highly Durable Oxygen Reduction Electrocatalysis

Luo

Chen

et al. 2019

Adv Funct Materials

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Pt-based alloy nanocrystals have shown great success in oxygen reduction electrocatalysis owing to their unique surface and electronic structures. However, they suffer from severe stability issues due to the dissolution of non-noble metal elements, leading to the "trade-off " between activity and stability. In this work, targeting the stability issue of a Pt x Cu y -based alloy, Pt 2 CuW 0.25 ternary alloy nanoparticles are synthesized by thermal reduction strategy based on wet-chemical method using W(CO) 6 as a reductant. Apart from the competitive activity, the obtained Pt 2 CuW 0.25 /C shows remarkable stability, whereby the area specific activity and mass activity maintain 89.5% and 95.9% of the initial values, respectively, after 30 000 cycles of accelerated polarization between 0.6 and 1.1 V (vs reversible hydrogen electrode). By using vacancy formation energy of surface Pt as the descriptor, it is found that the enhanced stability of Pt 2 CuW 0.25 /C originates mainly from the stronger bonding between W and Pt/Cu atoms, acting as an "adhesive" to stabilize the atoms from dissolution, which is further verified by chemical stability experiments. This work demonstrates a rational design strategy for ternary alloy nano-electrocatalyst that has high thermodynamic stability while maintaining high activity by employing high-melting-point metal.

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Section: Introductionmentioning

confidence: 99%

Tungsten as “Adhesive” in Pt₂CuW_0.25 Ternary Alloy for Highly Durable Oxygen Reduction Electrocatalysis

Luo

Chen

et al. 2019

Adv Funct Materials

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“…This modification of the chemical environment of the Pt sites makes it possible to tune the activity and durability of the catalyst. Previous studies have shown the positive effect of small amounts of gold on the durability of Pt–M‐based composites . In our recent results, it was shown that by doping the Pt skin surface of the nanoparticles, Cu dissolution can be hindered .…”

Section: Introductionmentioning

confidence: 60%

Gold Doping in PtCu₃/HSAC Nanoparticles and Their Morphological, Structural, and Compositional Changes during Oxygen Reduction Reaction Electrochemical Cycling

et al. 2017

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Pt‐based nanoparticles supported on high‐surface‐area carbon (HSAC) show very good properties as catalysts in polymer electrolyte membrane fuel cells (PEMFC). In many cases, however, the initial high activity of such catalysts rapidly drops as caused by various detrimental phenomena occurring in a typical electrochemical environment. In this work, a detailed study of a highly active system composed of PtCu3/HSAC nanoparticles with partially ordered structure and Pt skin with the addition of Au is performed. By using aberration‐corrected scanning transmission electron microscopy, the effects of adding small amounts of gold compared to the nonmodified sample are followed through the different stages of an electrochemical cycling degradation protocol. Various morphological changes such as faceting, reshaping, and thickening of the Pt skin are investigated for both sets of samples on the atomic level. Interesting features such as well‐defined shapes and surface defects are observed after degradation. However, the most important differences in terms of durability seem related to particle porosity. Finally, the experimental morphological observations are successfully reproduced by dealloying simulation with kinetic Monte Carlo modeling.

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“…To mimic Pt 3 Ni(111) single crystals that show extremely high ORR activity, octahedral and icosahedral Pt-based nanostructures enclosed by {111} facets have been studied [78,82,[87][88][89][90]. The impressive performance evolution of shaped PtNi nanoparticles in the past 5 years has been summarized by Strasser et al [43], and show enormous improvements in ORR activity.…”

Section: Facet-controlled (111) Surfacementioning

confidence: 99%

Rational Design and Synthesis of Low-Temperature Fuel Cell Electrocatalysts

Tian

Yang

et al. 2018

Electrochem. Energ. Rev.

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Recent progresses in proton exchange membrane fuel cell electrocatalysts are reviewed in this article in terms of cathodic and anodic reactions with a focus on rational design. These designs are based around gaining active sites using model surface studies and include high-index faceted Pt and Pt-alloy nanocrystals for anodic electrooxidation reactions as well as Pt-based alloy/core-shell structures and carbon-based non-precious metal catalysts for cathodic oxygen reduction reactions (ORR). High-index nanocrystals, alloy nanoparticles, and support effects are highlighted for anodic catalysts, and current developments in ORR electrocatalysts with novel structures and different compositions are emphasized for cathodic catalysts. Active site structures, catalytic performances, and stability in fuel cells are also reviewed for carbon-based non-precious metal catalysts. In addition, further developmental perspectives and the current status of advanced fuel cell electrocatalysts are provided.

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Octahedral PtCu alloy nanocrystals with high performance for oxygen reduction reaction and their enhanced stability by trace Au

Cited by 147 publications

References 58 publications

Tungsten as “Adhesive” in Pt₂CuW_0.25 Ternary Alloy for Highly Durable Oxygen Reduction Electrocatalysis

Tungsten as “Adhesive” in Pt₂CuW_0.25 Ternary Alloy for Highly Durable Oxygen Reduction Electrocatalysis

Gold Doping in PtCu₃/HSAC Nanoparticles and Their Morphological, Structural, and Compositional Changes during Oxygen Reduction Reaction Electrochemical Cycling

Rational Design and Synthesis of Low-Temperature Fuel Cell Electrocatalysts

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Octahedral PtCu alloy nanocrystals with high performance for oxygen reduction reaction and their enhanced stability by trace Au

Cited by 147 publications

References 58 publications

Tungsten as “Adhesive” in Pt2CuW0.25 Ternary Alloy for Highly Durable Oxygen Reduction Electrocatalysis

Tungsten as “Adhesive” in Pt2CuW0.25 Ternary Alloy for Highly Durable Oxygen Reduction Electrocatalysis

Gold Doping in PtCu3/HSAC Nanoparticles and Their Morphological, Structural, and Compositional Changes during Oxygen Reduction Reaction Electrochemical Cycling

Rational Design and Synthesis of Low-Temperature Fuel Cell Electrocatalysts

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Tungsten as “Adhesive” in Pt₂CuW_0.25 Ternary Alloy for Highly Durable Oxygen Reduction Electrocatalysis

Tungsten as “Adhesive” in Pt₂CuW_0.25 Ternary Alloy for Highly Durable Oxygen Reduction Electrocatalysis

Gold Doping in PtCu₃/HSAC Nanoparticles and Their Morphological, Structural, and Compositional Changes during Oxygen Reduction Reaction Electrochemical Cycling