pdau nanoparticles
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2021 ◽  
Vol 4 (9) ◽  
pp. 9790-9798
Author(s):  
Run-Dong Ding ◽  
Yu-Lin Li ◽  
Feng Leng ◽  
Ming-Jun Jia ◽  
Jie-Hui Yu ◽  
...  

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 481
Author(s):  
Lazar Rakočević ◽  
Irina Srejić ◽  
Aleksandar Maksić ◽  
Jelena Golubović ◽  
Svetlana Štrbac

Hydrogen evolution reaction (HER) was investigated on reduced graphene oxide (rGO)-supported Au and PdAu nanoparticles in acid solution. The graphene spread over glassy carbon (rGO/GC) was used as a support for the spontaneous deposition of Au and Pd. The resulting Au/rGO and PdAu/rGO electrodes were characterized using atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) techniques. Phase AFM images have shown that the edges of the rGO sheets were active sites for the deposition of both Au and Pd. XPS analysis revealed that the atomic percentages of both Au and PdAu nanoparticles were slightly higher than 1%. The activity of the PdAu/rGO electrode for the HER was remarkably high, with the overpotential close to zero. HER activity was stable over a 3 h testing time, with a low Tafel slope of approx. −46 mV/dec achieved after prolonged hydrogen evolution at a constant potential.


Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 122
Author(s):  
Mikhail Mamatkulov ◽  
Ilya V. Yudanov ◽  
Andrey V. Bukhtiyarov ◽  
Konstantin M. Neyman

Structure of model bimetallic PdAu nanoparticles is analyzed aiming to find Pd:Au ratios optimal for existence of Pd1 single-atom surface sites inside outer Au atomic shell. The analysis is performed using density-functional theory (DFT) calculations and topological approach based on DFT-parameterized topological energy expression. The number of the surface Pd1 sites in the absence of adsorbates is calculated as a function of Pd concentration inside the particles. At low Pd contents none of the Pd atoms emerge on the surface in the lowest-energy chemical orderings. However, surface Pd1 sites become stable, when Pd content inside a Pd-Au particle reaches ca. 60%. Further Pd content increase up to almost pure Pd core is accompanied by increased concentration of surface Pd atoms, mostly as Pd1 sites, although larger Pd ensembles as dimers and linear trimers are formed as well. Analysis of the chemical orderings inside PdAu nanoparticles at different Pd contents revealed that enrichment of the subsurface shell by Pd with predominant occupation of its edge positions precedes emergence of Pd surface species.


2020 ◽  
Vol 10 (23) ◽  
pp. 7955-7964
Author(s):  
Yaovi Holade ◽  
Seydou Hebié ◽  
Ksenia Maximova ◽  
Marc Sentis ◽  
Philippe Delaporte ◽  
...  

Laser-synthesized PdAu nanoparticles demonstrate a strong synergetic effect on glucose oxidation combining high catalytic activity with ultrafast kinetics at low potentials.


Nanoscale ◽  
2019 ◽  
Vol 11 (21) ◽  
pp. 10524-10535 ◽  
Author(s):  
Lei Li ◽  
Xinyu Li ◽  
Zhiyao Duan ◽  
Randall J. Meyer ◽  
Rob Carr ◽  
...  

Surface segregation in bimetallic nanoparticles is critically important for their catalytic activity. Here, we use the adaptive kinetic Monte Carlo method to model the segregation dynamics in PdAu NPs over experimentally relevant time scales and demonstrate thermodynamically unfavorable Au@Pd core–shell and alloy NPs can be kinetically trapped at low temperature.


2019 ◽  
Vol 1 (11) ◽  
pp. 4415-4421 ◽  
Author(s):  
Luming Wu ◽  
Baoxia Ni ◽  
Rui Chen ◽  
Chengxiang Shi ◽  
Pingchuan Sun ◽  
...  

Ultrafine and highly dispersed PdAu nanoparticles were immobilized on amine functionalized carbon black (VXC-72-NH2) for dehydrogenation of formic acid (FA).


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