Spiers Memorial Lecture: Nanoalloys of multiple components; the road to advance the field and experimental and theoretical challenges

Lehr, Alexander; Velázquez‐Salazar, J. Jesús; Montejano‐Carrizales, J.M.; Mejía-Rosales, Sergio; Mendoza‐Cruz, Rubén; Bazán-Díaz, Lourdes; Yacamán, Miguel José

doi:10.1039/d2fd00137c

Cited by 6 publications

(8 citation statements)

References 61 publications

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“…Figure 2d displays the IFFT pattern corresponding to the FFT pattern, which also highlights the twin boundary at the edges of the lattice fringes extending in various directions. We express the results using the coincidence site lattice method designated by the symbol ΣN with the twin boundary corresponding to Σ3 [12a] . In the compressive strained region of the t‐AgPdF, the interplanar spacing of the lattice fringe for the (111) crystal plane is 0.225 nm, while it is 0.233 nm in the tensile strained region.…”

Section: Resultsmentioning

confidence: 99%

“…The movement of Shockley partial dislocations leaves stacking faults behind and twin boundaries can result and be bounded by two stacking faults. [ 12 ] Liu et al utilized metastable Pd nanoparticles with twin boundaries to catalyze the ethanol oxidation reaction, minimizing poisoned active sites and accelerating the catalytic process. [ 13 ] Huang et al introduced the increasing twin boundaries in Pd catalyst to enhance the methane combustion activity, and the defective structure with strain can lower the activation and desorption barriers.…”

Section: Introductionmentioning

confidence: 99%

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Stable Strain State of Single‐Twinned AgPdF Nanoalloys under Formate Oxidation Reaction

et al. 2023

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Surface reconstruction as common phenomenon during catalysis complicates the prediction and modeling on catalytic activity of the nanoalloy, hence developing a stable structure to be resistant to surface restructuring would provide an ideal prototype for substantial and reliable mechanism analysis. Herein, the single‐twinned structure in inverse AgPdF catalyst is constructed to enhance the catalytic activity and stability for the formate oxidation reaction (FOR). The single‐twinned AgPdF nanoalloy (t‐AgPdF) catalyst exhibits an enhanced peak current density of 4.6 A mgPd−1, a reduced onset potential of 0.44 V, a higher activity retention of 55.7% after 600 cycles, and a longer activity retention time of 55.9 h. Additionally, the t‐AgPdF catalyst presents a higher hydrogen generation rate of 1.11 mL mgPd−1 than that of single‐crystalline AgPd nanoalloy (AgPd) catalyst, and density functional theory calculations reveal that t‐AgPdF(111) surface exhibits a reduced activation energy of 0.59 eV for formate decomposition reaction. Impressively, the t‐AgPdF maintains compressive and tensile strain state along the Σ3 twin boundaries before and after the FOR, in contrast to AgPd. This is the first time to reveal that the nanotwinned structures contribute inverse t‐AgPdF catalysts the catalytic active sites with stable strain state since starting reaction for the FOR.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stable Strain State of Single‐Twinned AgPdF Nanoalloys under Formate Oxidation Reaction

et al. 2023

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“…The formation of alloyed or core@shell architecture is dependent on the miscibility of the two metals and can be predicted by different factors [25][26][27][28][29]:…”

Section: General Considerationsmentioning

confidence: 99%

Bimetallic copper-based nanowires and the means to create next-generation stable transparent electrodes

Križan,

Zimny,

Guyonnet

et al. 2023

Nano Ex.

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Metallic nanowire percolating network is one of the promising alternatives of the conventional transparent conducting electrodes. Among the conductive metals, copper appears as a relevant alternative to develop electrodes in a more sustainable and economical way (abundance of the supplies, geo-political risks regarding the supplies, environmental impact, and cost). However, Cu nanowires suffer from high instability in air, and one of the ways to increase stability as well as to boost properties related to transparent electrodes is to combine the Cu with another metal, resulting in bimetallic nanowires. Even though the field of fabrication of nanoalloys has been advancing at a rapid pace in the last two decades, binary nanowires are difficult to produce due to a wide range of parameters that must be aligned in regard to metals that are being combined, such as surface energy of the bulk metal, atomic radii, crystal lattice matching, redox potentials, etc. In this review, we present the current research landscape in making Cu-based bimetallic nanowires for the development of metal nanowire networks with high oxidation resistance. This analysis allows identifying the most promising bimetallic materials for obtaining highly efficient, robust and cost-effective electrodes.

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“…Such promises of HEA materials have unsurprisingly led several groups to explore them at the nanoscale, either as nanowires 57 or as nanoparticles. [58][59][60][61] In recent years the synthesis of various high-entropy alloy nanoparticles, or high-entropy nanoalloys (HENAs) made from AuCuPdNiCo, 62 CoNiPtAuCu, 63 AlCoCrCuFeNi, 64 the so-called Cantor alloy FeCrMnNiCo, [65][66][67] and even up to 8 different elements 68 were successfully reported.…”

Section: Introductionmentioning

confidence: 99%

“…85 Two types of mixtures were chosen to illustrate contrasted behaviors arising from combining different metals together. The AuCuPdNiCo set of metals has already been explored at the nanoscale by the Yacaman group 62 who highlighted the importance of grain boundaries. The AlCuFeCrNi mixture has previously been studied experimentally 86 and found in MD simulations to mix rather homogeneously.…”

Section: Introductionmentioning

confidence: 99%

The interplay between size, shape, and surface segregation in high-entropy nanoalloys

Calvo¹

2023

Phys. Chem. Chem. Phys.

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Spiers Memorial Lecture: Nanoalloys of multiple components; the road to advance the field and experimental and theoretical challenges

Abstract: The field of nanoalloys has been advancing at rapid pace in the last two decades. Many new characterization methods and theoretical advances have produced a substantial knowledge of the nanoalloys...

Cited by 6 publications

References 61 publications

Stable Strain State of Single‐Twinned AgPdF Nanoalloys under Formate Oxidation Reaction

Stable Strain State of Single‐Twinned AgPdF Nanoalloys under Formate Oxidation Reaction

Bimetallic copper-based nanowires and the means to create next-generation stable transparent electrodes

The interplay between size, shape, and surface segregation in high-entropy nanoalloys

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