Position of Cu Atoms at the Pt(111) Electrode Surfaces Controls Electrosorption of (H)SO4(2)− from H2SO4 Electrolytes

Tymoczko, Jakub; Schuhmann, Wolfgang; Bandarenka, Aliaksandr S.

doi:10.1002/celc.201300107

Cited by 5 publications

(3 citation statements)

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“…Unfortunately, none of them is ideal. [33][34][35] Assume the real surface area should be estimated for the unknown Cu-NSA sample by integration of the hydrogen underpotential deposition (or corresponding oxidation) area of the CVs (0.05-0.4 V) taking the value for the unmodified Pt(111) samples as the reference. [31,32] However, the surface coverage by certain species, and consequently the associated charge, depend on the status of the electrode/electrolyte interface.…”

Section: Selection Of Surface-limited Reactions To Estimate the Real mentioning

confidence: 99%

“…Figure 6 A shows the CVs for Pt(111) and a Pt(111) electrode modified by a Cu near-surface alloy (Cu-NSA). [33][34][35] Assume the real surface area should be estimated for the unknown Cu-NSA sample by integration of the hydrogen underpotential deposition (or corresponding oxidation) area of the CVs (0.05-0.4 V) taking the value for the unmodified Pt(111) samples as the reference. While this reaction is commonly used to determine the real surface area of Pt and Pt-alloy electrodes, referring to the unmodified Pt is not suitable in this case.…”

Section: Selection Of Surface-limited Reactions To Estimate the Real mentioning

confidence: 99%

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Experimental Aspects in Benchmarking of the Electrocatalytic Activity

et al. 2014

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With the high interest in improving the performance of electrocatalysts for technologically significant reactions, great efforts are directed at the assessment of the activities of various catalytic materials. For this purpose, it is important to compare the catalytic activities measured using different methods and under different conditions. To achieve this, it is of utmost importance to avoid certain methodological and instrumental issues that can severely affect the obtained experimental results. Using well‐defined systems, we demonstrate the importance of experimental conditions in the assessment and benchmarking of the activity of catalytic processes for various reactions. Particularly, we demonstrate that the correction of the uncompensated ohmic resistance using impedance spectroscopy measurements requires particular attention and additional procedures which are normally ignored. Additionally, we demonstrate how the uncompensated resistance changes with the potential if a non‐conducting gas phase is accumulated in the system, hence influencing the activity measurement. It is further shown that a correct choice for surface‐limited reactions for the determination of the real surface area of catalytic electrodes plays a key role in ensuring more meaningful activity assessment.

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Section: Selection Of Surface-limited Reactions To Estimate the Real mentioning

confidence: 99%

Section: Selection Of Surface-limited Reactions To Estimate the Real mentioning

confidence: 99%

Experimental Aspects in Benchmarking of the Electrocatalytic Activity

et al. 2014

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“…Selective positioning of monolayer amounts of foreign atoms at the surface and subsurface regions of metal electrodes is a promising way to optimize the properties of the electrode/electrolyte interface. , In our recent study, we demonstrated that the relative position of Cu atoms at the surface drastically changes the adsorption energies for (bi)sulfate anions at the Pt(111) interface . Here, we focus on the adsorption of anionic species present in Nafion membranes on Pt(111) and Cu/Pt(111) near-surface alloy (NSA) electrodes and their influence on the ORR kinetics.…”

Section: Introductionmentioning

confidence: 99%

Oxygen Reduction at a Cu-Modified Pt(111) Model Electrocatalyst in Contact with Nafion Polymer

et al. 2014

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The effect of Nafion on the performance of a model Cumodified Pt(111) electrocatalyst has been investigated using electrochemical techniques and density functional theory calculations. In this work, we demonstrate that Cu subsurface alloying not only increases the activity of model Pt( 111) electrodes toward the oxygen reduction reaction (ORR) but also largely prevents catalyst poisoning by electrolyte components relevant for polymer electrolyte membrane fuel cell applications. Our results indicate that specific adsorption of (bi)sulfates and sulfonates (present in Nafion membranes) on the Cu-modified Pt(111) electrocatalyst is gradually suppressed, which implies that the ORR activity in 0.05 M H 2 SO 4 electrolyte drastically increases, with a change in the corresponding pseudo-half-wave potential of ∼93 mV. Importantly, the Cu-modified Pt(111) electrocatalyst in contact with Nafion polymer shows an activity as high as that in the absence of this polymer in perchloric acid media.

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Sulfate-induced electrochemical instability in the transpassive region during the electrooxidation of Na2S on Pt

Cheng

2019

J Solid State Electrochem

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Position of Cu Atoms at the Pt(111) Electrode Surfaces Controls Electrosorption of (H)SO₄⁽²⁾⁻ from H₂SO₄ Electrolytes

Cited by 5 publications

References 50 publications

Experimental Aspects in Benchmarking of the Electrocatalytic Activity

Experimental Aspects in Benchmarking of the Electrocatalytic Activity

Oxygen Reduction at a Cu-Modified Pt(111) Model Electrocatalyst in Contact with Nafion Polymer

Sulfate-induced electrochemical instability in the transpassive region during the electrooxidation of Na2S on Pt

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