Structural Effects on Methanol Oxidation on Single Crystal Electrodes of Palladium

Hoshi, Nagahiro; Nakamura, Masashi; Haneishi, Hidenori

doi:10.5796/electrochemistry.85.634

Cited by 5 publications

(4 citation statements)

References 23 publications

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“…The anodic peaks observed around 0 V and 0.2 V (vs. RHE) for all of the above catalysts correspond to the hydrogen desorption from the Pd (111) and Pd (100) surfaces [36,37] . The same hydrogen desorption peak feature indicates that all the catalysts own the same surface morphology, and Pd (111) is the dominant phase exposed on the surface, which agrees well with the XRD results.…”

Section: Resultssupporting

confidence: 86%

Co and Ni Ratio Modulation‐Derived Electron Deficient Pd Trimetallic Catalysts for Enhanced Formic Acid Electrooxidation

Li,

Jiang,

Zhu

et al. 2024

ChemistrySelect

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PdCoNi trimetallic catalysts attracted extensive interest in direct formic acid fuel cells due to high poisoning resistance and high activity for formic acid electro‐oxidation (FAO). Herein, a series of Pd0.75CoxNiy/C alloys with a modulated ratio of Co and Ni are synthesized to investigate the effect of Co and Ni content on the electronic structure of Pd for FAO. The physical analysis demonstrated that the introduction of Co and Ni induces the lattice strain effect compared to monometallic Pd catalysts. As a consequence of fixing the total amount of Co and Ni, the strain effect is restricted, and the electronic perturbation of Pd is successfully regulated by varying the ratio of Co and Ni in Pd0.75CoxNiy/C trimetallic alloys. Pd loses more electrons, the bond strength of Pd−H is weakened, and FAO activity is enhanced first and then decreased as the Co content increases. Among the trimetallic catalysts, Pd0.75Co0.125Ni0.125/C trimetallic catalyst exhibits the highest current density of 3.253 mA cm−2 owing to the optimum electronic perturbation and Pd−H bond strength. This work provides a valuable guideline for future studies of Pd‐based trimetallic alloys.

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Section: Resultssupporting

confidence: 86%

Co and Ni Ratio Modulation‐Derived Electron Deficient Pd Trimetallic Catalysts for Enhanced Formic Acid Electrooxidation

Li,

Jiang,

Zhu

et al. 2024

ChemistrySelect

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“…Therefore, in the present electrolyte medium (H 2 SO 4 ), deposition of Pt on Pd(111) sites is less probable than on other sites during the short reaction time of 2 min (longer reaction time is avoided to minimize the Pt deposition on carbon support by direct FA oxidation). Figure also shows that the CV of Pd/C has two sharp peaks in the H UPD region, peak I and peak II, apparently corresponding to Pd(111) and Pd(100), whereas H UPD happens on Pd(110) in a wide potential range from 0.02 to 0.3 V RHE . , Interestingly, in the first sweep cycle of Pt@Pd/C/GC, the disappearance of peak II (see Figure ) coincided with the appearance of current peak due to the oxidation of adsorbed CO. Thus, it can be understood that Pd(100) sites are covered by CO-adsorbed Pt.…”

Section: Results and Discussionmentioning

confidence: 74%

“…Figure 2 also shows that the CV of Pd/C has two sharp peaks in the H UPD region, peak I and peak II, apparently corresponding to Pd(111) and Pd(100), whereas H UPD happens on Pd(110) in a wide potential range from 0.02 to 0.3 V RHE . 47,48 Interestingly, in the first sweep cycle of Pt@Pd/ C/GC, the disappearance of peak II (see Figure 2) coincided with the appearance of current peak due to the oxidation of adsorbed CO. Thus, it can be understood that Pd(100) sites are covered by CO-adsorbed Pt.…”

Section: Experimental Methodsmentioning

confidence: 79%

Self-Restraining Electroless Deposition for Shell@Core Particles and Influence of Lattice Parameter on the ORR Activity of Pt(Shell)@Pd(Core)/C Electrocatalyst

Mahesh

Sarkar

2018

J. Phys. Chem. C

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Ultrathin metal layer-coated particles have potential applications in various fields, especially in electrocatalysis, where catalytic activity can be increased by shell@ core design. In this article, a synthetic method is introduced to synthesize shell@core nanoparticles, in which the selected reducing agent can be electrochemically oxidized preferentially on the core particle but not on the shell metal. Once the shell metal is deposited on the core metal, the oxidation of the reducing agent is inhibited, subsequently forming a shell@core particle with an ultrathin shell. By this method, carbonsupported shell(Pt)@core(Pd) nanoparticles with submonolayer Pt shell were synthesized using formic acid as reducing agent. Spectroscopic characterizations, X-ray photoelectron spectroscopy and energy-dispersive system, confirmed the Pt deposition. The shell@core structure of Pt@Pd was corroborated by scanning transmission electron microscopy analysis. This Pt(shell)@Pd(core) electrocatalyst was tested for electrochemical reduction of oxygen. Further, the influence of lattice parameter on the catalytic activity for oxygen reduction reaction was examined by varying the lattice parameter of Pt@Pd nanoparticles.

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“…To date, many groups have reported the preparation of various Pd polyhedrons with specifically exposed facets: cubes with {100} facets, rhombic dodecahedron with {110} facets, and octahedron with {111} facets ( Figure ) . For instance, Hoshi et al carefully investigated the shape effect of Pd single crystal with different surface structure toward the methanol oxidation reaction (MOR) . Their experiments revealed that the Pd(111) surface showed the lowest activity, while the Pd(100) surface showed the highest activity for MOR.…”

Section: Introductionmentioning

confidence: 99%

Chemical Design of Palladium‐Based Nanoarchitectures for Catalytic Applications

Iqbal

Kaneti

Kim

et al. 2019

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100

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Palladium (Pd) plays an important role in numerous catalytic reactions, such as methanol and ethanol oxidation, oxygen reduction, hydrogenation, coupling reactions, and carbon monoxide oxidation. Creating Pd‐based nanoarchitectures with increased active surface sites, higher density of low‐coordinated atoms, and maximized surface coverage for the reactants is important. To address the limitations of pure Pd, various Pd‐based nanoarchitectures, including alloys, intermetallics, and supported Pd nanomaterials, have been fabricated by combining Pd with other elements with similar or higher catalytic activity for many catalytic reactions. Herein, recent advances in the preparation of Pd‐based nanoarchitectures through solution‐phase chemical reduction and electrochemical deposition methods are summarized. Finally, the trend and future outlook in the development of Pd nanocatalysts toward practical catalytic applications are discussed.

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Structural Effects on Methanol Oxidation on Single Crystal Electrodes of Palladium

Cited by 5 publications

References 23 publications

Co and Ni Ratio Modulation‐Derived Electron Deficient Pd Trimetallic Catalysts for Enhanced Formic Acid Electrooxidation

Co and Ni Ratio Modulation‐Derived Electron Deficient Pd Trimetallic Catalysts for Enhanced Formic Acid Electrooxidation

Self-Restraining Electroless Deposition for Shell@Core Particles and Influence of Lattice Parameter on the ORR Activity of Pt(Shell)@Pd(Core)/C Electrocatalyst

Chemical Design of Palladium‐Based Nanoarchitectures for Catalytic Applications

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