Thermodynamic studies of bromide adsorption at the Pt(111) electrode surface perchloric acid solutions: Comparison with other anions

Garcı́a-Aráez, Nuria; Climent, Vı́ctor; Herrero, Enrique; Feliu, Juan M.; Lipkowski, Jacek

doi:10.1016/j.jelechem.2006.04.008

Cited by 54 publications

(51 citation statements)

References 28 publications

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“…The thermodynamic properties that characterize (bi)sulphate adsorption can be obtained from the analysis of the corresponding electrocapillary equation (see for example [11,[23][24][25]). The first step to perform this analysis is the calculation of charge density vs. potential plots.…”

Section: Charge Density Plotsmentioning

confidence: 99%

Thermodynamic analysis of (bi)sulphate adsorption on a Pt(111) electrode as a function of pH

Garcı́a-Aráez

Climent

Rodríguez

et al. 2008

Electrochimica Acta

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Section: Charge Density Plotsmentioning

confidence: 99%

Thermodynamic analysis of (bi)sulphate adsorption on a Pt(111) electrode as a function of pH

Garcı́a-Aráez

Climent

Rodríguez

et al. 2008

Electrochimica Acta

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“…[10][11][12][13][14][15][16][17][18][19][20][21] Feliu et al, Abruna et al, and others have extensively investigated the influence of halides (I − , Br − , Cl − ) on platinum single crystal electrodes. [22][23][24][25][26][27][28][29][30][31][32][33][34][35] Most of the available surface sensitive techniques were used to elucidate adsorbate coverage and structure. Such techniques, including auger electron spectroscopy (AES), low energy electron diffraction (LEED), second harmonic generation (SHG), surface X-ray scattering (SXS), electrochemical scanning tunneling microscope (ESTM) 31,34 and electrochemical quartz crystal microbalance (EQCM), used to investigate anion adsorption have offered significant insight on the dependence of adsorption process on exposed single crystal orientations.…”

mentioning

confidence: 99%

Recovery of Active Surface Sites of Shape-Controlled Platinum Nanoparticles Contaminated with Halide Ions and Its Effect on Surface-Structure

Devivaraprasad¹,

Kar²,

Leuaa³

et al. 2017

J. Electrochem. Soc.

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The interaction of halide ions (I − , Br − , Cl − ) with well-cleaned faceted platinum (nanocube, cuboctahedral) nanoparticles and platinum polycrystalline is investigated in 0.5 M H 2 SO 4 electrolyte. Under electrochemical conditions, the Pt surface gets poisoned with halide ad-atoms and it causes the attenuation of both hydrogen adsorption/desorption in the lower potential region (0.06-0.4 V) and electroxidation of Pt nanoparticles in the higher potential region (0.6-1.2 V). Above certain concentration (5 × 10 −6 M), the strongly adsorbing I − ions mask the H upd features. On the other hand, Br − and Cl − ions alter the peak features in the H upd region, those are characteristic of different Pt surface sites. On excursion to higher potentials (∼>1.2 V), concurrent halogen evolution, Pt oxidation, and oxygen evolution are observed; the increase in peak intensity in the H upd region reflects the reconstruction of the Pt surface. To remove the adsorbed halide ions from the Pt surface, an in-situ potentiostatic method is employed, which involves holding the working electrode at ∼0.03 V in 0.1 M NaOH solution. The cleanliness and retention of surface-structure are confirmed from the voltammograms recorded in the test electrolyte and the recovery of oxygen reduction reaction (ORR) activity after cleaning the Br − ion-contaminated Pt surface supports this conjecture. Anions specifically adsorbed on precious metal surfaces adversely impact several electrochemical reactions including oxidation/ reduction, metal deposition, corrosion and dissolution.1-6 Catalyst poisoning by the adsorbed anions (halides, sulfates and others) is a well-known phenomenon and it decreases the activity of electrocatalysts; for example, in fuel-cell, batteries and electrolyzers. 7,8 Especially platinum, a material for catalyzing a variety of electrochemical reactions, is prone to get poisoned in the presence of adatoms/adsorbates/solution anions under electrochemical conditions. Thus, oxygen reduction reaction (ORR) in fuel cells is affected by the adsorbed species or impurities and it is highly dependent on the cleanliness and surface structure of the catalyst. [9][10][11][12][13] In hydrogen-bromine fuel cells, bromides and bromine species migrate across the membrane and poison the hydrogen-electrode catalyst; moreover, Pt dissolves in Br − ion-containing solutions. 22-35 Most of the available surface sensitive techniques were used to elucidate adsorbate coverage and structure. Such techniques, including auger electron spectroscopy (AES), low energy electron diffraction (LEED), second harmonic generation (SHG), surface X-ray scattering (SXS), electrochemical scanning tunneling microscope (ESTM) 31,34 and electrochemical quartz crystal microbalance (EQCM), used to investigate anion adsorption have offered significant insight on the dependence of adsorption process on exposed single crystal orientations. Thus, AES/LEED studies revealed that Cl − ion adsorption occurs on Pt(100) surface at lower potential than that with Pt(111) surfaces, indi...

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“…7,15 Thermodynamic analysis allowed the determination of parameters associated to this process, such as charge transfer numbers and energies of adsorption. 6,8,[16][17][18] When the study includes a surface acid base equilibrium, pH variation allows discrimination of the nature of the adsorbed species. 4,19 In this way, it was demonstrated that Pt(111) in contact with sulphuric acid solutions led to sulphate adsorption, 19 in agreement with results from other experimental techniques.…”

mentioning

confidence: 99%

Surface Acid–Base Properties of Anion-Adsorbed Species at Pt(111) Electrode Surfaces in Contact with CO₂-Containing Perchloric Acid Solutions

et al. 2016

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Abstract:Carbonate and bicarbonate adsorption on Pt(111) electrodes from CO 2 saturated acidic solutions is investigated by cyclic voltammetry and Fourier Transform Infrared Reflection Absorption Spectroscopy (FT-IRRAS). Spectroscopic results show carbonate and bicarbonate adsorption even at pH=1, where bulk concentration of these anions is negligible. Moreover, analysis of the potential dependence of band intensities corresponding to adsorbed carbonate and bicarbonate reveals an effect of the electrode potential on the surface acid-base equilibrium. In this regards, increasing potentials favor bicarbonate deprotonation, leading to carbonate formation. A tentative thermodynamic analysis is given to rationalize these trends.

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Thermodynamic studies of bromide adsorption at the Pt(111) electrode surface perchloric acid solutions: Comparison with other anions

Cited by 54 publications

References 28 publications

Thermodynamic analysis of (bi)sulphate adsorption on a Pt(111) electrode as a function of pH

Thermodynamic analysis of (bi)sulphate adsorption on a Pt(111) electrode as a function of pH

Recovery of Active Surface Sites of Shape-Controlled Platinum Nanoparticles Contaminated with Halide Ions and Its Effect on Surface-Structure

Surface Acid–Base Properties of Anion-Adsorbed Species at Pt(111) Electrode Surfaces in Contact with CO₂-Containing Perchloric Acid Solutions

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Thermodynamic studies of bromide adsorption at the Pt(111) electrode surface perchloric acid solutions: Comparison with other anions

Cited by 54 publications

References 28 publications

Thermodynamic analysis of (bi)sulphate adsorption on a Pt(111) electrode as a function of pH

Thermodynamic analysis of (bi)sulphate adsorption on a Pt(111) electrode as a function of pH

Recovery of Active Surface Sites of Shape-Controlled Platinum Nanoparticles Contaminated with Halide Ions and Its Effect on Surface-Structure

Surface Acid–Base Properties of Anion-Adsorbed Species at Pt(111) Electrode Surfaces in Contact with CO2-Containing Perchloric Acid Solutions

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Product

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Surface Acid–Base Properties of Anion-Adsorbed Species at Pt(111) Electrode Surfaces in Contact with CO₂-Containing Perchloric Acid Solutions