Influence of Ni doping on PtNi nanoparticles: Synthesis, electronic/atomic structure and photocatalyst investigations

Varshney, Mayora; Sharma, Aditya; Shin, Hyun‐Joon; Lee, Hyun Hwi; Jeon, Tae‐Yeol; Lee, Byeong-Hyeon; Chae, Keun Hwa; Won, Sung Ok

doi:10.1016/j.jpcs.2017.06.012

Cited by 17 publications

(7 citation statements)

References 42 publications

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“…The phase diagrams of the Ni-Pt and Cu-Pt systems clearly indicate that the formations of defined Pt3Ni and Pt3Cu alloy phases are possible at low temperatures [45,46], and the syntheses of PtxNi10-x and PtxCu10-x alloys were already performed by wet chemistry at room temperature [21,[47][48][49]. Then, the formations of the PtNi and PtCu alloys predicted by MD simulations are consistent with experimental results.…”

Section: Discussionsupporting

confidence: 81%

Pt₃MeAu (Me = Ni, Cu) Fuel Cell Nanocatalyst Growth, Shapes, and Efficiency: A Molecular Dynamics Simulation Approach

et al. 2019

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The formation of the ternary Pt3NiAu and Pt3CuAu nanostructures are examined using molecular dynamics simulations in the context of free (i.e. unsupported) cluster growth in an unreactive atmosphere. The role of Au segregation towards the cluster surface on the final composition and structure of the nanoparticles is highlighted, as well as the effect of temperature on the growth and structure of the ternary nanocatalysts. Indeed, while a Pt3NiAu nanoparticle consisted in core of Pt3Ni alloy surrounded by an Au sub-monolayer, a Pt3CuAu particle consisted in a PtxCu core alloy (x < 3) surrounded by a sub-monolayer of AuCu alloy. The predicted atomic structures are enlightening the experimental results obtained from low temperature syntheses of ternary nanomaterials and their electrochemical behaviors.

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Section: Discussionsupporting

confidence: 81%

Pt₃MeAu (Me = Ni, Cu) Fuel Cell Nanocatalyst Growth, Shapes, and Efficiency: A Molecular Dynamics Simulation Approach

et al. 2019

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“…Based on the d-spacings of most intence peak (111), lattice parameter 'a' has been carefully evaluated which decreases in the order Pd > Pd 90 Ni (Table T1). The degree of alloying i. e. % of Ni incorporated into the Pd lattice during the formation of statistical alloy has been calculated based on the Vegard's law [36] and shown in Table T1 of 'Supporting document.' As expected Pd 80 Ni 20 catalyst show maximum degree of alloying among the synthesized catalysts.…”

Section: Resultsmentioning

confidence: 99%

Anode Catalytic Activity of Palladium‐Nickel Alloy Nanoparticles for Ethanol Oxidation in Alkali

et al. 2020

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To fabricate cost‐effective anode catalysts for direct ethanol fuel cells (DEFC), Pd and a series of bimetallic PdxNi100‐x alloy nano catalyst has been synthesized by adhering toclassical wet chemical synthetic procedure. External capping agents have not been employed for stabilization of the nanoparticles. Several physicochemical characterizations reveal the generation of uniformly dispersed PdxNi100‐x catalysts with average crystallite size 6 nm. The catalytic capability of the PdxNi100‐x/C catalysts for ethanol oxidation reaction (EOR) has been verified by cyclic voltammetry (CV) and chronoamperometry (CA) study. It has been revealed that the peak current density is about 1.2 times higher for ethanol oxidation on Pd80Ni20/C catalyst than similarly synthesized Pd/C catalyst. Moreover, the catalytic proficiency of the bimetallic nano catalysts have been strongly dependent on the Pd : Ni ratio. The poisoning protected ability of the PdxNi100‐x/Ccatalysts leads to show stable performance after several cycles of continuous operation. Cyclic voltammetric and ex‐situ FTIR study of probable intermediates of EOR like acetaldehyde, sodium acetate reveal that Ni facilitate the generation of acetate in comparison to carbonate enlightening the reasonable mechanism of the ethanol oxidation reaction on PdNi surface.

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“…The anhydrous ethanol (AE) was chosen as a solvent because it possessed a low oxygen content and had been reported to achieve a high degree of alloying level in the PtNi nanoparticles [13]. In a typical synthesis, 518 mg of H 2 PtCl 6 •6H 2 O and 7.8 mg of NiCl 2 •6H 2 O were dissolved in 200 µL of water, and then, the mixture was sonicated for 10 min in ice-cold water with the addition of 50 µL TEA.…”

Section: Sample Preparationmentioning

confidence: 99%

“…Therefore, how to keep the relatively high catalytic activity of Pt-Ni nanomaterials and maintain a large ECSA in a convenient way is still a big issue with which to deal. Sodium borohydride (NaBH 4 ), as a strong reductant, has been frequently used in the synthesis of Pt-based nanomaterials [11][12][13]. It is known that the size and aggregation of the Pt-based nanoparticles can greatly affect the electrocatalysts' ECSA and the intrinsic catalytic activity for ORR [14].…”

Section: Introductionmentioning

confidence: 99%

Monodispersed Pt3Ni Nanoparticles as a Highly Efficient Electrocatalyst for PEMFCs

Yang

Liu

et al. 2019

Catalysts

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A facile strategy is proposed to synthesize monodispersed Pt3Ni nanoparticles. Such a kind of electrocatalyst shows a larger electrochemical surface area (98.9 m2 gpt−1) and double the mass activity of the oxygen reduction reaction activity compared to commercial Pt/C catalyst. The results show that the suitable addition of Ni and triethylamine in the reduction process plays an important role in controlling the size and dispersion of Pt3Ni nanoparticles. A further membrane electrode assembly test proves that as-prepared Pt3Ni nanoparticles can greatly enhance the electrochemical performance of a proton exchange membrane fuel cell, which exhibits a great potential of application in fuel cells.

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Influence of Ni doping on PtNi nanoparticles: Synthesis, electronic/atomic structure and photocatalyst investigations

Cited by 17 publications

References 42 publications

Pt₃MeAu (Me = Ni, Cu) Fuel Cell Nanocatalyst Growth, Shapes, and Efficiency: A Molecular Dynamics Simulation Approach

Pt₃MeAu (Me = Ni, Cu) Fuel Cell Nanocatalyst Growth, Shapes, and Efficiency: A Molecular Dynamics Simulation Approach

Anode Catalytic Activity of Palladium‐Nickel Alloy Nanoparticles for Ethanol Oxidation in Alkali

Monodispersed Pt3Ni Nanoparticles as a Highly Efficient Electrocatalyst for PEMFCs

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Influence of Ni doping on PtNi nanoparticles: Synthesis, electronic/atomic structure and photocatalyst investigations

Cited by 17 publications

References 42 publications

Pt3MeAu (Me = Ni, Cu) Fuel Cell Nanocatalyst Growth, Shapes, and Efficiency: A Molecular Dynamics Simulation Approach

Pt3MeAu (Me = Ni, Cu) Fuel Cell Nanocatalyst Growth, Shapes, and Efficiency: A Molecular Dynamics Simulation Approach

Anode Catalytic Activity of Palladium‐Nickel Alloy Nanoparticles for Ethanol Oxidation in Alkali

Monodispersed Pt3Ni Nanoparticles as a Highly Efficient Electrocatalyst for PEMFCs

Contact Info

Product

Resources

About

Pt₃MeAu (Me = Ni, Cu) Fuel Cell Nanocatalyst Growth, Shapes, and Efficiency: A Molecular Dynamics Simulation Approach

Pt₃MeAu (Me = Ni, Cu) Fuel Cell Nanocatalyst Growth, Shapes, and Efficiency: A Molecular Dynamics Simulation Approach