Bulk hierarchical nanoporous palladium prepared by dealloying PdAl alloys and its electrochemical properties

Kong, Qingquan; Lian, Lixian; Liu, Ying; Wang, Li; Feng, Wei

doi:10.1016/j.micromeso.2015.01.017

Cited by 29 publications

(16 citation statements)

References 35 publications

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“…[96,181] In the former study, nested bimodal np-Pd Figure 16. [96,181] In the former study, nested bimodal np-Pd Figure 16.…”

Section: Metal Catalystsmentioning

confidence: 88%

“…A bimodal porous structure is developed in regions where the microstructure is heterogeneous due to the different chemical activities for Al and PdAl 3 phases. [96] In regions where both phases are present, a bimodal structure is formed, whereas in regions with only PdAl 3, a monolithic porous structure is formed. The regions rich in Pd produce ligaments as small as 7 nm, and the regions rich in Al produce larger pores (%200 nm) with embedded smaller pores due to the PdAl 3 phase.…”

Section: Dealloyingmentioning

confidence: 99%

“…The dealloying then works differently on the separate phases, and the coarser microstructure from solidification later coexists with the finer microstructure created by dealloying. [96] Note that doping a precursor alloy with a more noble and low mobility element, such as Pt or Pd, can be used to reduce the size of the np ligaments in single or bimodal materials because of the slower surface diffusion of the more noble element. [95] Another example of multiphase precursors is demonstrated by the dealloying of Pd-Al alloys produced by spark plasma sintering to make hierarchical np-Pd.…”

Section: Dealloyingmentioning

confidence: 99%

“…[96] In the same study, two bimodal structures, one with larger pores than the other, were compared for catalytic activity. [96] In the same study, two bimodal structures, one with larger pores than the other, were compared for catalytic activity.…”

Section: Metal Catalystsmentioning

confidence: 99%

“…The regions rich in Pd produce ligaments as small as 7 nm, and the regions rich in Al produce larger pores (%200 nm) with embedded smaller pores due to the PdAl 3 phase. [96] Note that doping a precursor alloy with a more noble and low mobility element, such as Pt or Pd, can be used to reduce the size of the np ligaments in single or bimodal materials because of the slower surface diffusion of the more noble element. [75,[97][98][99] Hierarchical np-Pd has also been generated by the electrochemical dealloying of a Pd-Ni-P metallic glass.…”

Section: Dealloyingmentioning

confidence: 99%

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Nanoporous Metals with Structural Hierarchy: A Review

et al. 2017

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Nanoporous (np) metals have generated much interest since they combine several desirable material characteristics, such as high surface area, mechanical size effects, and high conductivity. Most of the research has been focused on np Au due to its relatively straightforward synthesis, chemical stability, and many promising applications in the fields of catalysis and actuation. Other materials, such as np-Cu, Ag, and Pd have also been studied. This review discusses recent advances in the field of np metals, focusing on new research areas that implement and leverage structural hierarchy while using np metals as their base structural constituents. First, we focus on single-element porous metals that are made of np metals at the fundamental level, but synthesized with additional levels of porosity. Second, we discuss the fabrication of composite structures, which use auxiliary materials to enhance the properties of np metals. Important applications of these hierarchical materials, especially in the fields of catalysis and electrochemistry, are also reviewed. Finally, we conclude with a discussion about future opportunities for the advancement and application of np metals.

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“…[96,181] In the former study, nested bimodal np-Pd Figure 16. [96,181] In the former study, nested bimodal np-Pd Figure 16.…”

Section: Metal Catalystsmentioning

confidence: 88%

Section: Dealloyingmentioning

confidence: 99%

Section: Dealloyingmentioning

confidence: 99%

Section: Metal Catalystsmentioning

confidence: 99%

Section: Dealloyingmentioning

confidence: 99%

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Nanoporous Metals with Structural Hierarchy: A Review

et al. 2017

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Failure Mechanisms and Scaling Laws of Nanoporous Aluminum: A Computational Study

et al. 2015

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Recent nanomechanical experiments and simulations reveal a ligament size-dependent effect on the strength of nanowires, nanocolumns, and nanofoams. Here, we show the failure mechanism and scaling laws of nanoporous aluminum (np-Al) using a molecular dynamics case study. We develop scaling laws for Young's modulus, yield strength, ultimate strength, and toughness with respect to relative density and ligament diameter for np-Al. Our findings offer useful insights into the knowledge of nanoporous metals' mechanical properties in order to support material scientists' intention of developing fully comprehensive scaling laws for nanoporous metals.

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Novel γ‐Al₂O₃ Supported Low Concentrated Pd Nanoalloy Catalyst for Improved Hydrogenation Ability of 2‐Methylfuran

Shang

Chu

et al. 2020

ChemistrySelect

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Pd−Al was constructed to deal with the issue that cyclic unsaturated compounds are unstable in hydrogenation reaction. Hydrogenation of 2‐methylfuran as a probe reaction in the fixed‐bed reactor afforded up to 99.9% yield and 100% chemo‐selectivity requiring only 100 °C and 2 MPa pressure. Compared with the previous hydrogenation catalyst, such as Ni based catalyst, Pd−Al nanoalloy catalyst employs better performance. Enhancement of catalytic activity, selectivity and stability was attributed to the construction of nano‐effect and Pd−Al alloy structure with low loading amount of Pd. Furthermore, Pd−Al nanoalloy catalyst presented excellent catalytic stability in hydrogenation reaction running for 150 h. Finally, a feasible mechanism of the reaction was proposed and proved by collecting intermediate.

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Bulk hierarchical nanoporous palladium prepared by dealloying PdAl alloys and its electrochemical properties

Cited by 29 publications

References 35 publications

Nanoporous Metals with Structural Hierarchy: A Review

Nanoporous Metals with Structural Hierarchy: A Review

Failure Mechanisms and Scaling Laws of Nanoporous Aluminum: A Computational Study

Novel γ‐Al₂O₃ Supported Low Concentrated Pd Nanoalloy Catalyst for Improved Hydrogenation Ability of 2‐Methylfuran

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Bulk hierarchical nanoporous palladium prepared by dealloying PdAl alloys and its electrochemical properties

Cited by 29 publications

References 35 publications

Nanoporous Metals with Structural Hierarchy: A Review

Nanoporous Metals with Structural Hierarchy: A Review

Failure Mechanisms and Scaling Laws of Nanoporous Aluminum: A Computational Study

Novel γ‐Al2O3 Supported Low Concentrated Pd Nanoalloy Catalyst for Improved Hydrogenation Ability of 2‐Methylfuran

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Novel γ‐Al₂O₃ Supported Low Concentrated Pd Nanoalloy Catalyst for Improved Hydrogenation Ability of 2‐Methylfuran