Water dissociation on well-defined platinum surfaces: The electrochemical perspective

Niet, Maria J. T. C. van der; Garcı́a-Aráez, Nuria; Hernández, Javier; Feliu, Juan M.; Koper, Marc T. M.

doi:10.1016/j.cattod.2012.04.059

Cited by 217 publications

(290 citation statements)

References 65 publications

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“…It was mentioned earlier that the reaction between CO and H 2 O demands water dissociation. The phenomenon of water adsorption and its dissociation over platinum catalysts is described in literature [31]. Recently, water dissociation on five platinum surfaces, i.e.…”

Section: The Activity Tests and Overall Discussionmentioning

confidence: 99%

Photocatalytic CO oxidation with water over Pt/TiO2 catalysts

Czupryn

Kocemba

Rynkowski

2017

Reac Kinet Mech Cat

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This paper reports that Pt/TiO 2 and to some extent, Pt/Al 2 O 3 and Pt/SiO 2 catalysts show some activity in the photocatalytic oxidation of CO by water at low temperature (\ 100°C) in the absence of oxygen. For Pt/TiO 2 catalysts, CO conversion is dependent on the Pt loading as well as the temperature of their reduction. There are an optimal platinum loading (5 wt%) and catalyst reduction temperature (500°C) ensuring the best photocatalytic efficiency. Catalytic performance results from the combined effects of electron-hole photogeneration and partial photodesorption of CO from the platinum surface, followed by the adsorption and subsequent dissociation of H 2 O. The probable mechanism of photooxidation of CO by H 2 O was proposed.

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Section: The Activity Tests and Overall Discussionmentioning

confidence: 99%

Photocatalytic CO oxidation with water over Pt/TiO2 catalysts

Czupryn

Kocemba

Rynkowski

2017

Reac Kinet Mech Cat

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“…Additionally shown are the surface oxidation and upd hydrogen adsorption (H upd ) regions, which were determined in the positive-and negative-going scans, respectively, in the supporting electrolyte solutions free of HCOOH/HCOO − (experimental data points were omitted to avoid complexity). The white area is the double-layer region, but it is noted that some amount In fact, the onset of OH − adsorption is reported to be located in the H upd region [48,49].…”

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confidence: 99%

The effect of pH on the electrocatalytic oxidation of formic acid/formate on platinum: A mechanistic study by surface-enhanced infrared spectroscopy coupled with cyclic voltammetry

Joo

Uchida

Cuesta

et al. 2014

Electrochimica Acta

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132

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Please cite this article as: J. Joo, T. Uchida, A. Cuesta, M.T.M. Koper, M. Osawa , The effect of pH on the electrocatalytic oxidation of formic acid/formate on platinum: A mechanistic study by surface-enhanced infrared spectroscopy coupled with cyclic voltammetry, Electrochimica Acta (2014), http://dx.doi.org/10. 1016/j.electacta.2014.02.040 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractThe electrocatalytic oxidation of formic acid (HCOOH) and formate (HCOO − ) to CO 2 on platinum has been studied over a wide range of pH (0-12) by surface-enhanced infrared absorption spectroscopy (SEIRAS) coupled with cyclic voltammetry. The peak current of HCOOH/HCOO − oxidation exhibits a volcano-shaped pH dependence peaked at a pH close to the pK a of HCOOH (3.75). The experimental result is reasonably explained by a simple kinetic model that HCOO − oxidation is the dominant reaction route over the whole pH range.HCOOH is oxidized after being converted to HCOO − via the acid-base equilibrium. The ascending part of the volcano plot at pH < 4 is ascribed mostly to the increase of the molar ratio of HCOO − , while the descending part at pH > 4 is ascribed to the suppression of HCOO − oxidation by adsorbed OH or oxidation of the electrode surface. In acidic media, HCOOH is

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“…Ideally, it would have been expected that the voltammetric profiles of the electrodes in perchloric acid and NaOH solution were the same in the RHE scale, since only 85 adsorbed hydrogen and OH are involved in the voltammograms. 24 However, it should be reminded that adsorption processes on the electrode surfaces are always competitive since water (or any solvent) is always present on the electrolytic media. For platinum surfaces, the interactions between water and platinum are 90 significant, as revealed by the change in the work function of Pt(111) surfaces upon water adsorption.…”

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Oxygen reduction reaction on stepped platinum surfaces in alkaline media

Rizo

Herrero

Feliu

2013

Phys. Chem. Chem. Phys.

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110

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The oxygen reduction reaction (ORR) in 0.1 M NaOH on platinum single crystal electrodes has been studied using hanging meniscus rotating disk electrode configuration. Basal planes and stepped surfaces with (111) and (100) terraces have been employed. The results indicate that the Pt(111) electrode has the highest electrocatalytic activity of all the studied surfaces. The addition of steps on this electrode surface diminishes significantly the reactivity of the surface towards the ORR. In fact, the reactivity of the steps 10 for the surfaces with wide terraces can be considered negligible with respect to that measured for the terrace. On the other hand, Pt(100) and Pt(110) electrodes have much lower activity than the Pt(111) electrode. These results have been compared with those obtained in acid media to understand the role of the pH and the adsorbed OH on the mechanism. It is proposed that the surface covered by adsorbed OH is active for the reduction of the oxygen molecules.

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Water dissociation on well-defined platinum surfaces: The electrochemical perspective

Cited by 217 publications

References 65 publications

Photocatalytic CO oxidation with water over Pt/TiO2 catalysts

Photocatalytic CO oxidation with water over Pt/TiO2 catalysts

The effect of pH on the electrocatalytic oxidation of formic acid/formate on platinum: A mechanistic study by surface-enhanced infrared spectroscopy coupled with cyclic voltammetry

Oxygen reduction reaction on stepped platinum surfaces in alkaline media

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