Direct evidence for active site-dependent formic acid electro-oxidation by topmost-surface atomic redistribution in a ternary PtPdCu electrocatalyst

Cui, Chunhua; Li, Hui; Cong, Huai‐Ping; Yu, Shu‐Hong; Tao, Franklin Feng

doi:10.1039/c2cc35822k

Cited by 21 publications

(22 citation statements)

References 29 publications

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Section: Resultsmentioning

confidence: 99%

“…The formic acid oxidation LSVs for both catalysts is characterized by a peak in the region of 0.8–1.1 V with a corresponding shoulder at lower potentials. In terms of the mechanism, the peak-shoulder feature in the LSVs of both catalysts has been widely shown to be associated with catalysts that undergo an indirect mechanism for the oxidation of methanol. , …”

Section: Resultsmentioning

confidence: 99%

“…In terms of the mechanism, the peak-shoulder feature in the LSVs of both catalysts has been widely shown to be associated with catalysts that undergo an indirect mechanism for the oxidation of methanol. 43,44 The indirect mechanism is expected for pure platinum and platinum-enriched alloy catalysts because of the high density of Pt active sites on the surface. In these catalysts, the dehydrogenation of methanol occurs at Pt−Pt pair sites, resulting in the rapid formation of an adsorbed CO intermediate at low overpotentials.…”

Section: Acs Omegamentioning

confidence: 99%

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Sol–Gel Synthesis of Ruthenium Oxide Nanowires To Enhance Methanol Oxidation in Supported Platinum Nanoparticle Catalysts

et al. 2019

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A template-directed, sol–gel synthesis is utilized to produce crystalline RuO2 nanowires. Crystalline nanowires with a diameter of 128 ± 15 nm were synthesized after treating the nanowires at 600 °C in air. Analysis of these nanowires by X-ray powder diffraction revealed the major crystalline phase to be tetragonal RuO2 with a small quantity of metallic ruthenium present. Further analysis of the nanowire structures by high-resolution transmission electron microscopy reveals that they are polycrystalline and are composed of interconnected, highly crystalline, nanoparticles having an average size of ∼25 nm. Uniform 3 nm Pt nanoparticles were dispersed on the surface of RuO2 nanowires using an ambient, solution-based technique yielding a hybrid catalyst for methanol oxidation. Linear sweep voltammograms (LSVs) and chronoamperometry performed in the presence of methanol in an acidic electrolyte revealed a significant enhancement in the onset potential, mass activity, and long-term stability compared with analogous Pt nanoparticles supported on commercially available Vulcan XC-72R carbon nanoparticles. Formic acid oxidation LSVs and CO stripping voltammetry revealed that the RuO2-supported Pt nanoparticles exhibit significantly higher CO tolerance, which leads to higher catalytic stability over a period of several hours. X-ray photoelectron spectroscopy results suggest that crystalline RuO2 leads to less-significant oxidation of the Pt surface relative to more widely studied hydrous RuO2 supports, thereby increasing catalytic performance.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Acs Omegamentioning

confidence: 99%

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Sol–Gel Synthesis of Ruthenium Oxide Nanowires To Enhance Methanol Oxidation in Supported Platinum Nanoparticle Catalysts

et al. 2019

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“…Depending on size, 12 shape, 13 and alloying capability with other metals, [14][15][16] the catalytic activity of Pt-based catalysts varies. Typically, Pt nanoparticles between 2 nm and 5 nm are considered to be the optimal particle size.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of ultrathin PtPdBi nanowire and its enhanced catalytic activity towards p-nitrophenol reduction

et al. 2014

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Ultrathin PtPdBi tri-metallic nanowires (NWs, diameters ranged from 3 nm to 5 nm) were prepared in a onepot polyol process in which the molar ratios of the three metals could be tuned depending on the amount of initial precursors. Transmission electron microscopy (TEM), X-ray diffraction (XRD) and elemental mapping revealed that these NWs were alloys with a face-centered cubic crystal structure similar to PtPd alloy. p-Nitrophenol was used as a probe to assess the catalytic activities of the as-prepared PtPdBi NWs. The results indicated that the existence of a small amount of Bi in the PtPdBi alloy efficiently improved its catalytic capability towards the reduction of p-nitrophenol. At the specified Pt : Pd : Bi ratio of 55 : 38 : 7, PtPdBi nanowires showed the best catalytic activity of all the nanomaterials tested (Pt, Pd and PdPd spherical nanoparticles; PtBi and PdBi nanowires) a feature that was attributed to the optimal synergistic effect of the three metallic elements.

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“…In recent years, different factors, such as adsorbates, heat treatment, and de‐alloying, have been used to induce segregation in alloyed nanoparticles. Electrocatalytic segregation has also been studied but in these cases a dissolution factor is involved and due to this the process is not reversible. Although bimetallic PdRh alloyed nanoparticles have shown reversible behavior under both oxidative and reductive conditions this reversible behavior is still rare in other nanoparticles.…”

mentioning

confidence: 99%

Ultra-small Tetrametallic Pt-Pd-Rh-Ag Nanoframes with Tunable Behavior for Direct Formic Acid/Methanol Oxidation

Saleem

Yang

et al. 2016

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Reversible tuning of ultra-small multimetallic Pt-Pd-Rh-Ag nanoframes is achieved. These nanoframes showed tunable and reversible modes for the oxidation of small organic molecules by simply inducing segregation with adsorbates, such as SO and OH . This is the first example of reversible segregation under electrocatalytic conditions in atomic-sized electrocatalysts. These nanoframes also showed a controllable activity and good stability for the oxidation of small organic molecules.

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Direct evidence for active site-dependent formic acid electro-oxidation by topmost-surface atomic redistribution in a ternary PtPdCu electrocatalyst

Cited by 21 publications

References 29 publications

Sol–Gel Synthesis of Ruthenium Oxide Nanowires To Enhance Methanol Oxidation in Supported Platinum Nanoparticle Catalysts

Sol–Gel Synthesis of Ruthenium Oxide Nanowires To Enhance Methanol Oxidation in Supported Platinum Nanoparticle Catalysts

Synthesis of ultrathin PtPdBi nanowire and its enhanced catalytic activity towards p-nitrophenol reduction

Ultra-small Tetrametallic Pt-Pd-Rh-Ag Nanoframes with Tunable Behavior for Direct Formic Acid/Methanol Oxidation

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