Electrochemical Deposition of Pt–RuO x ⋅nH2O Composites on Conductive Diamond and Its Application to Methanol Oxidation in Acidic Media

Spătaru, Tanţa; Preda, Loredana; Osiceanu, Petre; Munteanu, Cornel; Marcu, Mihai; Lete, Cecilia; Spătaru, Nicolae; Fujishima, Akira

doi:10.1007/s12678-015-0292-8

Cited by 17 publications

(18 citation statements)

References 52 publications

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“…This result contrasts with those of hydrous ruthenium oxide supports, which were found to result in a shift in the peaks and measurable oxidation of the Pt surface. 22,26…”

Section: Resultsmentioning

confidence: 99%

“…30 In terms of hydrous ruthenium oxide supports, Fujishima and co-workers observed specific activities of 0.1 mA·cm –2 for hybrid Pt/hydrous ruthenium oxide nanostructures on conductive diamond at approximately 0.7 V in 0.1 M HClO 4 containing 3.2 M methanol. 22…”

Section: Resultsmentioning

confidence: 99%

“…27,32 In the case of the widely used hydrous ruthenium oxide supports, XPS measurements have shown that the SMSI effect is strong and leads to partial, irreversible oxidation of the Pt particle surface. 22,26 Although this increases the available oxide species for the bifunctional oxidation of CO, the oxidation of the Pt particles leads to a reduction of the available Pt active sites, potentially lowering the mass activity of the catalyst.…”

Section: Resultsmentioning

confidence: 99%

“…23,25,30 In addition, several reports have shown that oxide supports lead to significant changes of the electronic structure of Pt via the strong metal/support interaction (SMSI) effect. 6,22,27,32 The structural interaction between the oxide support and Pt catalysts leads to significant variations in the d-band vacancy of the Pt NP and can promote either reversible or irreversible oxidation of Pt, depending on the strength of the interaction. A higher degree of oxophilicity of the Pt catalyst is expected to further enhance CO tolerance.…”

Section: Introductionmentioning

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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“…This result contrasts with those of hydrous ruthenium oxide supports, which were found to result in a shift in the peaks and measurable oxidation of the Pt surface. 22,26…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2019

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“…The charge transfer behavior between these potentials can be attributed to redox processes at the interface and to the good stability of the composite, supportive attributes for electrochemical applications. [34,45] The charge-discharge behavior of the composite-modified electrodes was investigated by chronopotentiometry within the potential range of 0.5-0.9 V, at several current values (Figure S5c. For an applied current higher than 20 μA mg À 1 , the discharge curves are almost mirror images of the charging ones, suggesting that under these experimental conditions, the redox species responsible for the pseudocapacitance are regenerating.…”

Section: Sample Elemental Composition [%]mentioning

confidence: 99%

Rational Functionalization Towards Redox‐Active TEMPO Stable Free‐Radical‐Hydrochar Composites

et al. 2021

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Although both stable free organic radicals and biomass-derived hydrochars have emerged as appealing, green, multifunctional materials, their association has not been explored. In this study, strength is found to lie in their union, which primarily leads to stable redox-active free-radical-hydrochar composites that can generate unexpected opportunities for the development of advanced metal-free sustainable materials. The composites are obtained by a straightforward green one-pot hydrothermal procedure. The loading of stable free radicals of nitroxide type and their localization is engineered by the nature of the carbohydrate and the reaction status; vigorous reaction parameters promote faster nucleation and growth kinetics of the hydrochar products, leading to a covalent immobilization of redox species on the surface of the carbonaceous microspherical aggregates. The nitroxide free-radical-hydrochar materials demonstrate enhancements in terms of both electrocatalytic activity and capacitive features.

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Diamond Films as Support for Electrochemical Systems for Energy Conversion and Storage

Costa

Santos

Silva

et al. 2019

Topics in Applied Physics

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Electrochemical Deposition of Pt–RuO x ⋅nH2O Composites on Conductive Diamond and Its Application to Methanol Oxidation in Acidic Media

Cited by 17 publications

References 52 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

Rational Functionalization Towards Redox‐Active TEMPO Stable Free‐Radical‐Hydrochar Composites

Diamond Films as Support for Electrochemical Systems for Energy Conversion and Storage

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