Bimetallic Nanocrystals: Syntheses, Properties, and Applications

Gilroy, Kyle D.; Ruditskiy, Aleksey; Peng, Hsin‐Chieh; Qin, Dong; Xia, Younan

doi:10.1021/acs.chemrev.6b00211

Cited by 1,425 publications

(1,363 citation statements)

References 564 publications

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“…The reduction potential of Au III (φHAuCl 4 /Au, +0.99 V versus the standard hydrogen electrode) 41 is higher than that of Rh III (φRhCl 3 /Rh, +0.76 V versus the standard hydrogen electrode). 42 Thus the HAuCl 4 precursor may be reduced preferentially to generate Au nanocrystals during the synthesis that will subsequently act as the cores for the growth of the Rh shells. …”

Section: Resultsmentioning

confidence: 99%

Bimetallic AuRh nanodendrites consisting of Au icosahedron cores and atomically ultrathin Rh nanoplate shells: synthesis and light-enhanced catalytic activity

et al. 2017

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Precise control of the morphology, composition and structure of metal nanostructures not only effectively improves their catalytic activity and durability but also enhances their range of applications. In this work, bimetallic Au@Rh core-shell nanodendrites are synthesized by a facile one-pot hydrothermal method. Physical characterizations show that the dendritic Rh consists of two-dimensional (2D) ultrathin Rh nanoplates with a thickness of approximately 1.2 nm. For the first time, Au@Rh core-shell nanostructures are used as a catalyst for the hydrogen generation reaction from aqueous hydrazine solution (N 2 H 4 = N 2 +2H 2 , HGR-N 2 H 4 ). Bimetallic Au@Rh core-shell nanodendrites exhibit improved catalytic activity and durability for the HGR-N 2 H 4 compared with commercial Rh nanocrystals, which can be attributed to the atomically ultrathin structure of 2D Rh nanoplates and the interconnected structure of nanodendrites, respectively. Under light irradiation, bimetallic Au@Rh core-shell nanodendrites show light-enhanced catalytic activity for the HGR-N 2 H 4 , originating from the distinctive localized surface plasmon resonance of Au icosahedron cores.

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Section: Resultsmentioning

confidence: 99%

Bimetallic AuRh nanodendrites consisting of Au icosahedron cores and atomically ultrathin Rh nanoplate shells: synthesis and light-enhanced catalytic activity

et al. 2017

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“…The marriage of two metals can endorse both a geometric effect and an electronic effect. The geometric effect refers to the generation of a new catalytic active site due to the combination of two metals [88]. The electronic structure can be altered due to the formation of the hetero-metal-metal bond, which can be favorable for catalytic reaction [88].…”

Section: Alloyed Noble Metal Clusters For Orrmentioning

confidence: 99%

“…The geometric effect refers to the generation of a new catalytic active site due to the combination of two metals [88]. The electronic structure can be altered due to the formation of the hetero-metal-metal bond, which can be favorable for catalytic reaction [88]. Furthermore, specifically for ORR, the combination of two metals can tune the adsorption capability of oxygen molecules.…”

Section: Alloyed Noble Metal Clusters For Orrmentioning

confidence: 99%

Oxygen Reduction Reaction Catalyzed by Noble Metal Clusters

Tang

Wang

2018

Catalysts

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Highly-efficient catalysts for the oxygen reduction reaction (ORR) have been extensively investigated for the development of proton exchange membrane fuel cells (PEMFCs). The state-ofthe-art Pt/C catalysts suffer from high price, limited accessibility of Pt, sluggish reaction kinetics, as well as undesirable long-term durability. Engineering ultra-small noble metal clusters with high surface-to-volume ratios and robust stabilities for ORR represents a new avenue. After a simple introduction regarding the significance of ORR and the recent development of noble metal clusters, the general ORR mechanism in both acidic and basic media is firstly discussed. Subsequently, we will summarize the recent efforts employing Pt, Au, Ag, Pd and Ru clusters, as well as the alloyed bi-metallic clusters for acquiring highly efficient catalysts to enhance both the activity and stability of ORR. Molecular noble metal clusters with definitive composition to reveal the relevant ORR mechanism will be particularly highlighted. Finally, the current challenges, the future outlook, as well as the perspectives in this booming field will be proposed, featuring the great opportunities and potentials to engineering noble metal clusters as highly-efficient and durable cathodic catalysts for fuel cell applications.

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“…Many options are now available in the literature for the preparation of shape-controlled metal nanoparticles [5,[17][18][19][20], most of them based on the chemical reduction of a metallic precursor in the presence of a capping agent. Although other experimental parameters such as electrolyte, temperature, reducing time, nature of the reducing agent and others may also affect, the role of the capping agent is extremely important because it modifies the surface energies of the nanoparticles during their nucleation and growth steps thus overcoming the thermodynamic limitations and allowing metal nanoparticles with a particular shape to be obtained.…”

Section: Introductionmentioning

confidence: 99%

Electrocatalysis on shape-controlled metal nanoparticles: Progress in surface cleaning methodologies

Montiel

Vidal‐Iglesias

Montiel

et al. 2017

Current Opinion in Electrochemistry

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The use of shape-controlled metal nanoparticles has produced not only a clear enhancement in the electrocatalytic activity of different reactions of interest but also a better understanding of the effect of the surface structure on nanoscaled materials. However, it is well-accepted that a correct understanding of the correlations between shape/surface structure and electrochemical reactivity indispensably requires the use of clean surfaces. In this regard, and considering that most of the synthetic methodologies available in the literature for the preparation of these shaped metal nanoparticles employ capping agents, the development of effective surface cleaning methodologies able to remove such capping agents from the surface of the corresponding nanoparticles, becomes an extremely important prerequisite to subsequently evaluate their electrocatalytic properties for any reaction of interest.Consequently, in this contribution, we summarize the most relevant advances about surface cleaning procedures applied to different shaped metal nanoparticles for electrocatalytic purposes. It is worth mentioning that this work will only include contributions in which the surface cleanness of the samples is specifically evaluated using well-established electrochemical tools.

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Bimetallic Nanocrystals: Syntheses, Properties, and Applications

Cited by 1,425 publications

References 564 publications

Bimetallic AuRh nanodendrites consisting of Au icosahedron cores and atomically ultrathin Rh nanoplate shells: synthesis and light-enhanced catalytic activity

Bimetallic AuRh nanodendrites consisting of Au icosahedron cores and atomically ultrathin Rh nanoplate shells: synthesis and light-enhanced catalytic activity

Oxygen Reduction Reaction Catalyzed by Noble Metal Clusters

Electrocatalysis on shape-controlled metal nanoparticles: Progress in surface cleaning methodologies

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