ChemInform Abstract: CO Electrooxidation on Well‐Characterized Pt‐Ru Alloys.

Gasteiger, Hubert A.; Marković, Nenad M.; Ross, Philip N.; Cairns, Elton J.

doi:10.1002/chin.199418005

Cited by 54 publications

(88 citation statements)

References 1 publication

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“…According to this assumption, the CVs for the catalysts in the base electrolyte change drastically after heating, as can be seen in Figures 4 and 5, as a consequence of the elimination of the organic residues. Results in Figure 5 are in agreement with that reported in the literature for wellcleaned Pt-Ru alloys used as catalysts for CO electrochemical oxidation [32]. Then, it is proved that the treatment at 350…”

Section: Resultssupporting

confidence: 90%

Use of Dendrimers during the Synthesis of Pt-Ru Electrocatalysts for PEM Fuel Cells: Effects on the Physical and Electrochemical Properties

Calderón

Calvillo

Lázaro

et al. 2011

International Journal of Electrochemistry

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In this work, Pt-Ru catalysts were synthesized by a novel methodology which includes the use as encapsulating molecules of dendrimers of different generation: zero (DN-0), one (DN-1), two (DN-2), and three (DN-3). Synthesized catalysts were heattreated at 350• C, and the effects of this treatment was established from the physical (X-ray dispersive energy (XDE) and X-ray diffraction (XRD)) and electrochemical characterization (cyclic voltammetry and chronoamperometry). Results showed that the heat-treatment benefits the catalytic properties of synthesized materials in terms of CO and methanol electrochemical oxidation. The curves for CO stripping were more defined for heat-treated catalysts, and methanol oxidation current densities were higher for these materials. These changes are principally explained from the removal of organic residues remaining on the surface of the Pt-Ru nanoparticles after the synthesis procedure. After the activation of the catalysts by heating at 350• C, the real importance of the use of these encapsulating molecules and the effect of the generation of the dendrimer become visible. From these results, it can be concluded that synthesized catalysts are good catalytic anodes for direct methanol fuel cells (DMFCs).

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Section: Resultssupporting

confidence: 90%

Use of Dendrimers during the Synthesis of Pt-Ru Electrocatalysts for PEM Fuel Cells: Effects on the Physical and Electrochemical Properties

Calderón

Calvillo

Lázaro

et al. 2011

International Journal of Electrochemistry

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“…CO gas was first bubbled through the solution for 15 min while setting the electrode potential at 0.1 V. Afterwards, the dissolved CO was removed by N 2 bubbling through the solution for 30 min and then, the adsorbed CO was stripped by sweeping the potential between 0.0 and 1.0 V at 20 mV s −1 without stirring. The ECSA for the CO oxidation was estimated taking into account that the oxidation of a CO monolayer on polycrystalline Pt needs 420 µC cm −2 [4,9,43]. After CO stripping, the activity of the Pt(Cu)/C and Pt-Ru(Cu)/C catalysts was recovered as demonstrated by the consecutive cyclic voltammograms, which retraced those obtained before the CO adsorption.…”

Section: Electrochemical Testingmentioning

confidence: 99%

Effects of the Electrodeposition Time in the Synthesis of Carbon-Supported Pt(Cu) and Pt-Ru(Cu) Core-Shell Electrocatalysts for Polymer Electrolye Fuel Cells

et al. 2016

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Pt(Cu)/C and Pt-Ru(Cu)/C electrocatalysts with core-shell structure supported on Vulcan Carbon XC72R have been synthesized by potentiostatic deposition of Cu nanoparticles on the support, galvanic exchange with Pt and spontaneous deposition of Ru species. The duration of the electrodeposition time of the different species has been modified and the obtained electrocatalysts have been characterized using electrochemical and structural techniques. The High Resolution Transmission Electron Microscopy (HRTEM), Fast Fourier Transform (FFT) and Energy Dispersive X-ray (EDX) microanalyses allowed the determining of the effects of the electrodeposition time on the nanoparticle size and composition. The best conditions identified from Cyclic Voltammetry (CV) corresponded to onset potentials for CO and methanol oxidation on Pt-Ru(Cu)/C of 0.41 and 0.32 V vs. the Reversible Hydrogen Electrode (RHE), respectively, which were smaller by about 0.05 V than those determined for Ru-decorated commercial Pt/C. The CO oxidation peak potentials were about 0.1 V smaller when compared to commercial Pt/C and Pt-Ru/C. The positive effect of Cu was related to its electronic effect on the Pt shells and also to the generation of new active sites for CO oxidation. The synthesis conditions to obtain the best performance for CO and methanol oxidation on the core-shell Pt-Ru(Cu)/C electrocatalysts were identified. When compared to previous results in literature for methanol, ethanol and formic acid oxidation on Pt(Cu)/C catalysts, the present results suggest an additional positive effect of the deposited Ru species due to the introduction of the bifunctional mechanism for CO oxidation.

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“…According to the bifunctional mechanism [36], CO ad on the Pt site could be removed by reacting with the neighboring OH ad on the Ru site to yield CO 2 , thus the electrocatalytic activity is strongly dependent on the distribution of Pt and Ru atoms at an atomic level. The broader CO ad stripping peak and its positive shift for PtRu-GMC-X (X = 1, 2) indicate a lower catalytic activity for the CO ad electro-oxidation due to the poor alloy degree of PtRu in the two samples [37][38][39]. Assuming the charge of CO monolayer adsorption is 420 lC cm À2 , the ECSAs of all catalysts studied here were calculated by integrating the charge of CO stripping [40] and the corresponding results are summarized in Table 2.…”

Section: Potentiodynamic Measurements In a Half Cellmentioning

confidence: 99%

Synthesis of graphitic mesoporous carbons with different surface areas and their use in direct methanol fuel cells

Jiang

Tang

et al. 2012

Carbon

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ChemInform Abstract: CO Electrooxidation on Well‐Characterized Pt‐Ru Alloys.

Cited by 54 publications

References 1 publication

Use of Dendrimers during the Synthesis of Pt-Ru Electrocatalysts for PEM Fuel Cells: Effects on the Physical and Electrochemical Properties

Use of Dendrimers during the Synthesis of Pt-Ru Electrocatalysts for PEM Fuel Cells: Effects on the Physical and Electrochemical Properties

Effects of the Electrodeposition Time in the Synthesis of Carbon-Supported Pt(Cu) and Pt-Ru(Cu) Core-Shell Electrocatalysts for Polymer Electrolye Fuel Cells

Synthesis of graphitic mesoporous carbons with different surface areas and their use in direct methanol fuel cells

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