Synthesis and Characterization of Core-Shell Cu-Ru, Cu-Rh, and Cu-Ir Nanoparticles

Foucher, Alexandre C.; Yang, Shengsong; Rosen, Daniel J.; Lee, Jennifer D.; Huang, Renjing; Jiang, Zizhen; Barrera, Francisco; Chen, Kelly; Hollyer, George G.; Friend, C. M.; Gorte, Raymond J.; Murray, Christopher B.; Stach, Eric A.

doi:10.1021/jacs.2c02538

Cited by 27 publications

(37 citation statements)

References 55 publications

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“…The Arrhenius plot for pure Cu particles in a previous work showed high activity for Cu at high temperatures, in the 230-280 °C range. 32 This is also consistent with previous publications as Cu is not considered an efficient catalyst for CO oxidation. 41,42,43 .…”

Section: Resultssupporting

confidence: 93%

“…This has been shown in other publications about bimetallic particles with Cu. 32,21 Upon exposure to oxygen at high temperatures, Cu migrates to the surface and form Cu oxide, which covers the second transition metals. In our case, it seems that the Pt-rich surface prevented migration of Cu to the surface, which allowed Cu-Pt particles to remain active after the cycle.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and Characterization of Stable Cu-Pt Nanoparticles under Reductive and Oxidative Conditions

Foucher

Yang

Rosen

et al. 2023

Preprint

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We report a synthesis method for highly monodisperse Cu-Pt alloy nanospheres. Small and large Cu-Pt particles with a Cu:Pt ratio of 1:1 can be obtained through colloidal synthesis at 300 °C. The fresh particles have a Pt-rich surface and a Cu-rich core and can be converted into an intermetallic phase after annealing at 800 °C under H2. First, we demonstrated the stability of fresh particles under redox conditions at 400 °C, as the Pt-rich surface prevents substantial oxidation of Cu. Then, a combination of in situ scanning transmission electron microscopy, in situ X-ray absorption spectroscopy, and CO oxidation measurements of the intermetallic CuPt phase before and after redox treatments at 800 °C showed promising activity and stability for CO oxidation. Full oxidation of Cu was prevented after exposure to O2 at 800 °C. The activity and structure of the particles was only slightly changed after exposure to O2 at 800 °C and were recovered after re-reduction at 800 °C. Additionally, the intermetallic CuPt phase showed enhanced catalytic properties compared to the fresh particles with a Pt-rich surface or pure Pt particles of the same size. Thus, the incorporation of Pt with Cu does not lead to a rapid deactivation and degradation of the material, as seen with other bimetallic systems. This work provides a synthesis route to control the design of Cu-Pt nanostructures and underlines the promising properties of these alloys (intermetallic and non-intermetallic) for heterogeneous catalysis.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Stable Cu-Pt Nanoparticles under Reductive and Oxidative Conditions

Foucher

Yang

Rosen

et al. 2023

Preprint

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“…Synthesis with metal carbonyl can tune the shape of nanoparticles and yield spheres or cubes, depending on the quantity of precursors and the reaction temperature . Finally, the amount of capping agent added to the solution, such as oleylamine, and the reaction temperature, are crucial to control the size and composition of nanoparticles. ,, Previous publications have reported promising properties of Pt-based bimetallic particles. For instance, it has been demonstrated that core–shell Pt 3 Pb–Pt nanoparticles are highly efficient for formic acid oxidation .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Stable Cu–Pt Nanoparticles under Reductive and Oxidative Conditions

et al. 2023

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We report a synthesis method for highly monodisperse Cu−Pt alloy nanoparticles. Small and large Cu−Pt particles with a Cu/Pt ratio of 1:1 can be obtained through colloidal synthesis at 300 °C. The fresh particles have a Pt-rich surface and a Cu-rich core and can be converted into an intermetallic phase after annealing at 800 °C under H 2 . First, we demonstrated the stability of fresh particles under redox conditions at 400 °C, as the Pt-rich surface prevents substantial oxidation of Cu. Then, a combination of in situ scanning transmission electron microscopy, in situ X-ray absorption spectroscopy, and CO oxidation measurements of the intermetallic CuPt phase before and after redox treatments at 800 °C showed promising activity and stability for CO oxidation. Full oxidation of Cu was prevented after exposure to O 2 at 800 °C. The activity and structure of the particles were only slightly changed after exposure to O 2 at 800 °C and were recovered after re-reduction at 800 °C. Additionally, the intermetallic CuPt phase showed enhanced catalytic properties compared to the fresh particles with a Pt-rich surface or pure Pt particles of the same size. Thus, the incorporation of Pt with Cu does not lead to a rapid deactivation and degradation of the material, as seen with other bimetallic systems. This work provides a synthesis route to control the design of Cu−Pt nanostructures and underlines the promising properties of these alloys (intermetallic and non-intermetallic) for heterogeneous catalysis.

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“…Rhodium (Rh) is the nearest metal to Platinum (Pt) located at the vertex of volcano plot with small Gibbs free energy 13 , and has been demonstrated have excellent catalytic stability. Distinct from bulk metals, the intrinsic activity of the catalyst has been demonstrated to strongly depend on the size, the exposed defects, and the supports [14][15][16][17][18][19] . As an important traditional metal support, carbon materials show great application value in catalysis field, therefore, carbon materials are considered as the key component of highperformance catalysts [20][21][22] .…”

mentioning

confidence: 99%

Rhodium nanocrystals on porous graphdiyne for electrocatalytic hydrogen evolution from saline water

et al. 2022

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The realization of the efficient hydrogen conversion with large current densities at low overpotentials represents the development trend of this field. Here we report the atomic active sites tailoring through a facile synthetic method to yield well-defined Rhodium nanocrystals in aqueous solution using formic acid as the reducing agent and graphdiyne as the stabilizing support. High-resolution high-angle annular dark-field scanning-transmission electron microscopy images show the high-density atomic steps on the faces of hexahedral Rh nanocrystals. Experimental results reveal the formation of stable sp–C~Rh bonds can stabilize Rh nanocrystals and further improve charge transfer ability in the system. Experimental and density functional theory calculation results solidly demonstrate the exposed high active stepped surfaces and various metal atomic sites affect the electronic structure of the catalyst to reduce the overpotential resulting in the large-current hydrogen production from saline water. This exciting result demonstrates unmatched electrocatalytic performance and highly stable saline water electrolysis.

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Synthesis and Characterization of Core-Shell Cu-Ru, Cu-Rh, and Cu-Ir Nanoparticles

Cited by 27 publications

References 55 publications

Synthesis and Characterization of Stable Cu-Pt Nanoparticles under Reductive and Oxidative Conditions

Synthesis and Characterization of Stable Cu-Pt Nanoparticles under Reductive and Oxidative Conditions

Synthesis and Characterization of Stable Cu–Pt Nanoparticles under Reductive and Oxidative Conditions

Rhodium nanocrystals on porous graphdiyne for electrocatalytic hydrogen evolution from saline water

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