Effect of MO2 (M = Ce, Mo, Ti) layer on activity and stability of PtCo/C catalysts during an oxygen reduction reaction

Chaisubanan, Napapat; Hunsom, Mali; Vergnes, Hugues; Pruksathorn, Kejvalee

doi:10.1016/j.enconman.2016.02.033

Cited by 8 publications

(5 citation statements)

References 35 publications

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“…Additionally, Table reports on the average diameters of each of the binary alloy catalysts tested as well as of the measured d spacing values, derived from the TEM and HRTEM images in Figures and . All of the measured d spacing values are in accordance with corresponding data determined for other similar Pt-based alloy nanostructures described in the literature. − …”

Section: Resultssupporting

confidence: 88%

Role of Chemical Composition in the Enhanced Catalytic Activity of Pt-Based Alloyed Ultrathin Nanowires for the Hydrogen Oxidation Reaction under Alkaline Conditions

et al. 2016

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With the increased interest in the development of hydrogen fuel cells as a plausible alternative to internal combustion engines, recent work has focused on creating alkaline fuel cells (AFC), which employ an alkaline environment. Working in alkaline as opposed to acidic media yields a number of tangible benefits, including (i) the ability to use cheaper and plentiful precious-metal-free catalysts, due to their increased stability, (ii) a reduction in the amount of degradation and corrosion of Pt-based catalysts, and (iii) a longer operational lifetime for the overall fuel cell configuration. However, in the absence of Pt, no catalyst has achieved activities similar to those of Pt. Herein, we have synthesized a number of crystalline ultrathin PtM alloy nanowires (NWs) (M = Fe, Co, Ru, Cu, Au) in order to replace a portion of the costly Pt metal without compromising on activity while simultaneously adding in metals known to exhibit favorable synergistic ligand and strain effects with respect to the host lattice. In fact, our experiments confirm theoretical insights about a clear and correlative dependence between measured activity and chemical composition. We have conclusively demonstrated that our as-synthesized alloy NW catalysts yield improved hydrogen oxidation reaction (HOR) activities as compared with a commercial Pt standard as well as with our as-synthesized Pt NWs. The Pt7Ru3 NW system, in particular, quantitatively achieved an exchange current density of 0.493 mA/cm2, which is higher than the corresponding data for Pt NWs alone. Additionally, the HOR activities follow the same expected trend as their calculated hydrogen binding energy (HBE) values, thereby confirming the critical importance and correlation of HBE with the observed activities.

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Section: Resultssupporting

confidence: 88%

Role of Chemical Composition in the Enhanced Catalytic Activity of Pt-Based Alloyed Ultrathin Nanowires for the Hydrogen Oxidation Reaction under Alkaline Conditions

et al. 2016

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“…Combining theoretical and experimental studies, we explored the regulating mechanism of different interfacial chemical bonds, including Ir–O, Ir–Mo, and mixed Ir–Mo/O, of MoO 2 -supported Ir catalysts for HOR activity because Ir is one of the precious metals with relatively high HOR catalytic activity , and MoO 2 is a commonly used support with excellent stability. − Using density functional theory (DFT) calculations, we correlated the HOR theoretical activity with the interface and the surface electronic structure of MoO 2 -supported Ir catalysts. Experimentally, we prepared Ir/O–MoO 2 , Ir/Mo–MoO 2 , and Ir/MoO 2 catalysts and measured the HOR electrochemical activity to verify the theoretical results.…”

Section: Introductionmentioning

confidence: 99%

Revealing the Regulation Mechanism of Ir–MoO₂ Interfacial Chemical Bonding for Improving Hydrogen Oxidation Reaction

Li¹,

Xie²,

Zheng³

et al. 2021

ACS Catal.

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Different interfacial chemical bonds, Ir−O, Ir−Mo, and mixed Ir− Mo/O, are employed to explore the regulating mechanism of MoO 2 -supported Ir catalysts in optimizing hydrogen oxidation reaction (HOR) activity by using density functional theory calculations and an experimental study. We found that the interfacial electron distribution of the catalyst Ir/O−MoO 2 via Ir−O bonds is localized, only concentrated on Ir−O bonds, which downshifts the d-band center of the surface Ir atoms and weakens H and OH adsorption. It accordingly enhances the HOR activity. Its HOR exchange current density is as high as 1.96 mA/cm ECSA 2 . In contrast, the interfacial electron distribution of the catalyst Ir/Mo−MoO 2 via Ir−Mo bonds is delocalized, dispersed on all interfacial Ir and Mo atoms, which upshifts the d-band center of surface Ir atoms and strengthens H and OH adsorption. Its HOR activity is not as good as Ir/O−MoO 2 . Its HOR exchange current density is only about 1.47 mA/cm ECSA 2 . In the case of the mixed interfacial bonds Ir−Mo/O of Ir/ MoO 2 , irregular H adsorption on the catalyst is responsible for the poor HOR activity with an exchange current density of 1.10 mA/ cm ECSA 2 . We conclude that regulating interfacial chemical bonding patterns can optimize the electronic configuration of the metal oxide-supported metal catalysts and thus improve their catalytic activity effectively.

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“…Pruksathorn et al studied the performance of the ORR by adding different types of metal oxides (CeO 2 , MoO 2 and TiO 2 ) and metal loading amounts (0.03-0.45 mg cm À2 ) on the PtCo/C catalyst layer. 208 The research results indicate that although the addition of metal oxides on the catalyst layer has no effect on the morphology of PtCo/C, it significantly affects the electrochemical surface area (ECSA), internal contact resistance (ICR), and hydrophilic/hydrophobic properties of the catalyst layer. In addition, they significantly affect the activity and stability of the ORR in acidic solutions and PEM fuel cell operations.…”

Section: Oxygen Reduction Reactionmentioning

confidence: 97%

Rare earth oxide based electrocatalysts: synthesis, properties and applications

Jiang,

Fu,

Liang

et al. 2024

Chem. Soc. Rev.

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Effect of MO2 (M = Ce, Mo, Ti) layer on activity and stability of PtCo/C catalysts during an oxygen reduction reaction

Abstract: OATAO is an open access repository that collects the work of some Toulouse researchers and makes it freely available over the web where possible.

Cited by 8 publications

References 35 publications

Role of Chemical Composition in the Enhanced Catalytic Activity of Pt-Based Alloyed Ultrathin Nanowires for the Hydrogen Oxidation Reaction under Alkaline Conditions

Role of Chemical Composition in the Enhanced Catalytic Activity of Pt-Based Alloyed Ultrathin Nanowires for the Hydrogen Oxidation Reaction under Alkaline Conditions

Revealing the Regulation Mechanism of Ir–MoO₂ Interfacial Chemical Bonding for Improving Hydrogen Oxidation Reaction

Rare earth oxide based electrocatalysts: synthesis, properties and applications

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Effect of MO2 (M = Ce, Mo, Ti) layer on activity and stability of PtCo/C catalysts during an oxygen reduction reaction

Abstract: OATAO is an open access repository that collects the work of some Toulouse researchers and makes it freely available over the web where possible.

Cited by 8 publications

References 35 publications

Role of Chemical Composition in the Enhanced Catalytic Activity of Pt-Based Alloyed Ultrathin Nanowires for the Hydrogen Oxidation Reaction under Alkaline Conditions

Role of Chemical Composition in the Enhanced Catalytic Activity of Pt-Based Alloyed Ultrathin Nanowires for the Hydrogen Oxidation Reaction under Alkaline Conditions

Revealing the Regulation Mechanism of Ir–MoO2 Interfacial Chemical Bonding for Improving Hydrogen Oxidation Reaction

Rare earth oxide based electrocatalysts: synthesis, properties and applications

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Revealing the Regulation Mechanism of Ir–MoO₂ Interfacial Chemical Bonding for Improving Hydrogen Oxidation Reaction