The Role of Anions in Single Crystal Platinum Cyclic Voltammograms

Souza-Garcia, Janaína; Angelucci, Camilo A.

doi:10.5935/0100-4042.20150048

Cited by 4 publications

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“…0.28 V and a sharp peak at ca. 0.39 V, related to desorption of hydrogen and adsorption of the anion on the defects and on wide (1x1) surface terraces, respectively [34,[37][38][39]. Figure 1(b) shows the evolution of the voltammetric profile of the Pt(100) electrode submitted to 20 cycles between 0.06 and 1.3 V. It can be seen that in the negative scan, immediately after the first cycle, the peak at ca.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Oxide formation as probe to investigate the competition between water and alcohol molecules for OH species adsorbed on platinum

Santiago

Oliveira

Roquetto

et al. 2019

Electrochimica Acta

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Section: Accepted Manuscriptmentioning

confidence: 99%

Oxide formation as probe to investigate the competition between water and alcohol molecules for OH species adsorbed on platinum

Santiago

Oliveira

Roquetto

et al. 2019

Electrochimica Acta

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“…The presence of adsorbed species and their adsorption strength can strongly affect reaction kinetics, activity and selectivity. [1][2][3][4][5][6][7] Electrocatalytic reactions are often influenced by nonreactive specifically adsorbed anions (spectator species), that lead to changes in structure and composition of the electrical doublelayer and alter the electronic properties of a catalyst's surface or even block active surface sites. [2,6,8] Therefore, understanding the electrochemical behaviour of anionic adlayers at the solidelectrolyte interface can help to improve reaction conditions and hence the overall electrocatalytic activity of an electrode surface towards a given reaction.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Acetate on Au(111): An in‐situ Scanning Tunnelling Microscopy Study and Implications on Formic Acid Electrooxidation

et al. 2019

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The adsorption of acetate on an Au(111) electrode surface in contact with acetic acid at pH 2.7 was imaged in‐situ using scanning tunnelling microscopy (STM). Two different ordered structures were imaged for acetate adsorbed in the bidentate configuration on the unreconstructed ()1×1 surface at 0.95 V (vs. the saturated calomel electrode, SCE). The first structure,(19×19)R23.45∘ , is metastable and transforms at constant potential within 20 minutes to a (2×2) structure, which is thermodynamically more favourable. The (2×2) acetate adlayer starts to form at step edges and propagates via nucleation and growth onto terraces. The findings from in‐situ STM are in agreement with the electrochemical behaviour of acetate on Au(111) characterized by voltammetry. A comparison is made with formate adsorption on Au(111). While acetate is not reactive, in contrast to formate, it can act as a spectator species in formic acid electrooxidation.

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“…Adsorption at the electrified interface is of fundamental importance in many fields of electrochemistry, such as electroanalytical chemistry, metal deposition, and corrosion. Due to the strong dependence not only on the chemical nature but also on the surface structure, well-ordered single-crystal electrode surfaces are commonly used to study adsorption processes and related phenomena on a fundamental level. − Electrosorption also plays a pivotal role in electrocatalysis since electrocatalytic reactions involve at least one adsorbed intermediate species. In addition, coadsorption of ions can have a strong impact on electrocatalytic processes, e.g., by blocking reactive sites .…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Formate on Au(111) in Acid Solution: Relevance for Electro-Oxidation of Formic Acid

Kibler

Al-Shakran

2016

J. Phys. Chem. C

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The behavior of formic acid on Au(111) in perchloric acid solution at room temperature has been investigated by electrochemical methods and in situ scanning tunneling microscopy (STM) in the potential region negative to surface oxidation. Specific adsorption of formate lifts the reconstruction of the Au(111) surface. Currents for formate adsorption have been separated from those of formic acid oxidation by varying the sweep rate between 0.01 and 50 V s −1 . A 2D phase transition within the formate layer adsorbed on long-range Au(111) terraces gives rise to a characteristic voltammetric needle-peak. Parallel chains of strongly bound formate have been imaged by in situ STM. Steady-state voltammetry at different formic acid concentrations shows a characteristic bell-shaped current maximum and a pronounced current jump related with the adlayer phase transition at more positive potentials. Oxidation kinetics of formic acid strongly depends on formate adsorption, which is determined by the electrode potential, the pH, and the formic acid concentration. Various adsorbates (bidentate and monodentate formate and/or carboxylate) with entirely different reactivity are supposed to play a role in the formic acid oxidation mechanism.

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The Role of Anions in Single Crystal Platinum Cyclic Voltammograms

Abstract: This review examined the state of the art of electrochemical and thermodynamic studies involving characteristic features related to the adsorption of anions present in the electrolyte solutions in contact with platinum single crystals electrodes. ]]>

Cited by 4 publications

References 0 publications

Oxide formation as probe to investigate the competition between water and alcohol molecules for OH species adsorbed on platinum

Oxide formation as probe to investigate the competition between water and alcohol molecules for OH species adsorbed on platinum

Adsorption of Acetate on Au(111): An in‐situ Scanning Tunnelling Microscopy Study and Implications on Formic Acid Electrooxidation

Adsorption of Formate on Au(111) in Acid Solution: Relevance for Electro-Oxidation of Formic Acid

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