Long-range structural effects in the anomalous voltammetry on ultra-high vacuum prepared Pt (111)

Wagner, Frederick T.; Ross, P.N.

doi:10.1016/0022-0728(88)85172-6

Cited by 154 publications

(43 citation statements)

References 31 publications

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“…The voltammograms are very similar to those recorded in 0.1 M HClO4 and in (0.1-x) M KClO4 + x M HClO4 mixtures. Therefore, no evidence of fluoride specific anion adsorption is observed, as expected from previous literature[16,[34][35][36][37][38]. At low potentials (E<0.4V), hydrogen adsorption takes place whereas at higher potentials (E>0.5 V) the voltammogram is dominated by hydroxide adsorption.…”

supporting

confidence: 75%

Study of the Pt (111) | electrolyte interface in the region close to neutral pH solutions by the laser induced temperature jump technique

Sebastián

Martínez‐Hincapié

Climent

et al. 2017

Electrochimica Acta

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The laser-induced temperature jump method is used to determine the potential of maximum entropy (pme) of a Pt(111) single crystal electrode in contact with an aqueous solution, in a wide pH range and in the absence of specifically adsorbed anions. For this purpose, buffer solutions composed of a mixture of NaF and HClO4 are used. The results are compared with those from non-buffered perchlorate solutions. The use of the NaF/HF buffer allows extending the pH range from 3 to 6, approaching the situation of a neutral pH. Laser experiments show that the pme appears located at nearly the same potential position in the whole pH range between 3 and 6. This value is around 300 mV vs SHE, in agreement with previous works. Moreover, the potential response to the fast thermal perturbation at high potentials, above the pme, indicates the presence of a slower contribution, resulting in a bipolar, non-monotonous, profile. Such behaviour is strongly affected by the presence of fluoride anion and/or hydrofluoric acid, thus evidencing a strong structural effect on interfacial water from these species. These results bring some light to the understanding of the interfacial properties in acid-neutral conditions, and also show the influence of different non-specifically adsorbed anions on the interfacial properties that cannot be evidenced only by cyclic voltammetry.

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supporting

confidence: 75%

Study of the Pt (111) | electrolyte interface in the region close to neutral pH solutions by the laser induced temperature jump technique

Sebastián

Martínez‐Hincapié

Climent

et al. 2017

Electrochimica Acta

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“…The immersion potential is more negative than the oxide film-formation region of platinum. [12] The sample potential is decreased stepwise, and reference spectra are then collected at 0.5 V. The negative-going bands at 2054 and 1810 cm À1 are assigned to on-top and bridged CO adsorbed on PtA C H T U N G T R E N N U N G (111), respectively. When the electrode potential is stepped below 0.7 V, the band intensities of adsorbed CO gradually decrease.…”

Section: Resultsmentioning

confidence: 99%

In‐situ Flow‐Cell IRAS Observation of Intermediates during Methanol Oxidation on Low‐Index Platinum Surfaces

2007

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Structural effects on intermediate species of methanol oxidation are studied on low-index planes of platinum using in-situ infrared (IR) spectroscopy. A flow cell is designed for rapid migration of reactant and product species on the electrode surface. IR spectra show adsorption of formate and the formation of carbonate species on the Pt(111) surface at potentials higher than that of CO oxidation. The band assignments for carbonate and formate are confirmed by vibrational isotope shifts. On Pt(100), the absorption band of adsorbed formate is much smaller than that on Pt(111). On the other hand, there is no adsorbed formate on Pt(110) in the potential region examined. The band intensity of formate follows the order: Pt(111)>Pt(100)>Pt(110). This order is opposite to that of the current density in the regions of higher potential. Adsorbed formate on Pt(111) behaves like a catalyst-poisoning intermediate, like adsorbed CO.

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“…The other issues debated over the last few decades are the stability and durability of metal nanoparticles, in particular that of Pt and Pd nanoparticle surfaces in electrochemical environment (or in the presence of adsorbates) (Clavilier and Armand, 1986; Wagner and Ross, 1988; Kolb, 1995). Previous studies have shown that the loss of electrochemical surface area (ESA) of metal nanoparticles limits the long-term performance (durability) of PEMFCs (Ferreira et al, 2005; Bi et al, 2007; Shao-Horn et al, 2007; Tripkovic et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Electrocatalysis of Oxygen Reduction Reaction on Shape-Controlled Pt and Pd Nanoparticles—Importance of Surface Cleanliness and Reconstruction

et al. 2019

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Shape-controlled precious metal nanoparticles have attracted significant research interest in the recent past due to their fundamental and scientific importance. Because of their crystallographic-orientation-dependent properties, these metal nanoparticles have tremendous implications in electrocatalysis. This review aims to discuss the strategies for synthesis of shape-controlled platinum (Pt) and palladium (Pd) nanoparticles and procedures for the surfactant removal, without compromising their surface structural integrity. In particular, the electrocatalysis of oxygen reduction reaction (ORR) on shape-controlled nanoparticles (Pt and Pd) is discussed and the results are analyzed in the context of that reported with single crystal electrodes. Accepted theories on the stability of precious metal nanoparticle surfaces under electrochemical conditions are revisited. Dissolution, reconstruction, and comprehensive views on the factors that contribute to the loss of electrochemically active surface area (ESA) of nanoparticles leading to an inevitable decrease in ORR activity are presented. The contribution of adsorbed electrolyte anions, in-situ generated adsorbates and contaminants toward the ESA reduction are also discussed. Methods for the revival of activity of surfaces contaminated with adsorbed impurities without perturbing the surface structure and its implications to electrocatalysis are reviewed.

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Long-range structural effects in the anomalous voltammetry on ultra-high vacuum prepared Pt (111)

Cited by 154 publications

References 31 publications

Study of the Pt (111) | electrolyte interface in the region close to neutral pH solutions by the laser induced temperature jump technique

Study of the Pt (111) | electrolyte interface in the region close to neutral pH solutions by the laser induced temperature jump technique

In‐situ Flow‐Cell IRAS Observation of Intermediates during Methanol Oxidation on Low‐Index Platinum Surfaces

Electrocatalysis of Oxygen Reduction Reaction on Shape-Controlled Pt and Pd Nanoparticles—Importance of Surface Cleanliness and Reconstruction

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