Single Pt–Pd Bimetallic Nanoparticle Electrode: Controllable Fabrication and Unique Electrocatalytic Performance for the Methanol Oxidation Reaction

Tang, Haoran; Huan, Hao; Zhu, Jiahui; Guan, Xianping; Qiu, Baijing; Li, Yongxin

doi:10.1002/chem.201900076

Cited by 20 publications

(16 citation statements)

References 44 publications

(49 reference statements)

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“…Metal nanoparticles (NPs) have attracted much attention over the past decades due to their unique optical, electronic, and physical properties. Understanding the electrooxidation process of metal NPs is very important because they have showed wide applications in electrocatalysis, sensing, and nanoelectronics. − The stochastic collision electrochemistry (SCE) method, depending on the recording current transients during collision between particles/molecules and microelectrode surface, has been widely utilized to monitor the electrochemical process of single molecules/particles . For example, Zhang and White observed the multipeak collision behavior during the electrooxidation of single silver nanoparticles .…”

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confidence: 99%

Unique Voltammetry of Silver Nanoparticles: From Single Particle to Aggregates

et al. 2019

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Understanding the electrooxidation process of metal nanoparticles (NPs) is very important because they have showed wide applications in electrocatalysis, sensing, and nanoelectronics. In this letter, we designed a strategy to investigate the anodic stripping voltammetry (ASV) of silver oxidation at single NP level and aggregation state by using gold single nanoelectrodes (SNEs) and ultramicroelectrodes. Results showed that the ASV peak potential and shape were significantly affected by the diameter and aggregation degree of the Ag NPs: symmetrical-peak shape, two-peak shape, and asymmetrical-peak shape appeared when Ag NPs changed from the single particle state to the large-aggregation state, and size-dependent ASVs for Ag NPs oxidation were also observed. These findings can help us deeply understand the metal NPs oxidation process and will benefit the related applications.

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Unique Voltammetry of Silver Nanoparticles: From Single Particle to Aggregates

et al. 2019

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“…The preparation of AgNWs adopts a simple laser-assisted pulling method according to the previous work of our group (details are provided in the Supporting Information section and Figure S1 in the Supporting Information). ,,,− Single Ag nanotips sealed with glass were first fabricated, and then, single AgNWs were obtained by HF (1:4, v/v) etching. Lengths of AgNWs could be adjusted by controlling the concentration of HF and the etching time …”

Section: Experimental Sectionmentioning

confidence: 99%

In Situ SERS Monitoring of the Plasmon-Driven Catalytic Reaction by Using Single Ag@Au Nanowires as Substrates

et al. 2021

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Single nanowires (NWs), as a kind of new surface-enhanced Raman scattering (SERS) substrates, have received extensive concern owing to their distinctive properties and distinct advantages. In this contribution, single Ag nanowires (AgNWs) and single Au-coated AgNWs (Ag@AuNWs) were fabricated by the laser-assisted pulling method and the galvanic replacement reaction, respectively. The prepared single Ag@AuNWs show both high SERS activity and catalytic activity through in situ monitoring and assessing the plasmon-driven surface-catalytic reaction of 4-nitrothiophenol (4-NTP) dimerizing to 4,4′-dimercaptoazobenzene and the reduction reaction of 4-NTP to paraaminothiophenol, respectively. It was found that the intensity of the Raman peak was affected greatly by the laser power, and the Raman peak could still be observed at 0.05% power under mild conditions (633 nm wavelength) in this single nanowire system. From the Raman spectrum, the SERS enhancement factor (EF) of 5.4 × 10 4 can be obtained, and the EF value of 1.3 × 10 9 can be reached at optimal conditions. Results have shown that single Ag@AuNWs can be utilized as a good platform for SERS applications with high sensitivity, stability, and reproducibility, which will benefit SERS-based research at the single entity level.

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“…Studies reporting nucleation and growth of single entities have been rapidly increasing in the past few years (Figure 3d). Different variants consist in (1) nucleating a single NP on a tunneling UME [66], a confined nanopore [67] or a nanodisk [68] or (2) confining metal salt precursors to either micelles [69] or attoliter water nanodroplets dispersed on an organic solvent [59].…”

Section: Electrochemical Nucleation and Growth Of Single Entitiesmentioning

confidence: 99%

Current atomic-level understanding of electrochemical nucleation and growth on low-energy surfaces

Ustarroz

2020

Current Opinion in Electrochemistry

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This review presents recent progress in the understanding of electrochemical phase formation on low-energy substrates, which is essential for metal electrodeposition and the design of stable batteries. Advanced characterization techniques and ultrasensitive electrochemical instrumentation give access to experimental data that were not available a few years back. Besides, the continuous development of theoretical models gradually provides a more complete description of multiple nucleation. However, important contradictions between experimental findings and theoretical formulations are found: nonclassical growth pathways, single-atom critical clusters, and cluster densities that are orders of magnitude higher than the calculated number of active sites. New descriptions of the initial steps of nucleation are discussed. They are grounded on nucleation being a nonactivated process, in which the initial stages of phase formation could involve simply adsorbed atoms collapsing into larger clusters driven by minimization of the overall interfacial energy. Finally, some remaining challenges and possible research directions are outlined.

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Single Pt–Pd Bimetallic Nanoparticle Electrode: Controllable Fabrication and Unique Electrocatalytic Performance for the Methanol Oxidation Reaction

Cited by 20 publications

References 44 publications

Unique Voltammetry of Silver Nanoparticles: From Single Particle to Aggregates

Unique Voltammetry of Silver Nanoparticles: From Single Particle to Aggregates

In Situ SERS Monitoring of the Plasmon-Driven Catalytic Reaction by Using Single Ag@Au Nanowires as Substrates

Current atomic-level understanding of electrochemical nucleation and growth on low-energy surfaces

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