Comparison of a bisulfate anion adsorbed on M(111) (M=Pt, Rh, Au, Ag and Cu)

Shingaya, Yoshitaka; Ito, M.

doi:10.1016/s0022-0728(99)00085-6

Cited by 68 publications

(57 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One positive-going band is centered at 1100 cm -1 and two negative-going bands are located at 1247 cm -1 and 960 cm -1 . These bands are in good agreement with those reported for sulfate adsorbed on Rh(111) in sulfuric acid solutions 16 . As already discussed in previous publications 6 , the positive feature at 1100 cm -1 is due to the dissolved SO 4 2-, which presents only one active stretching vibration located at this wavenumber.…”

Section: Effect Of Solution Aciditysupporting

confidence: 91%

“…Shyngaya et al used Ultra-High-Vacuum (UHV) models to identify the chemical nature of the adsorbed sulfate species on Pt(111) 15 and Au(111). 16 SO 3 is dosed on a pre-deposited water layer at 100 K. Upon dosing SO 3 the water was desorbed at different temperatures and the infrared spectra was then acquired. present for the surface with less water, they propose that bisulfate was converted into sulfuric acid molecules tilted on the surface.…”

Section: Discussionmentioning

confidence: 99%

“…In sulfuric acid solution they found similar vibrational features for Pt(111) and concluded that bisulfate is adsorbed at low potentials and sulfuric acid at high potentials. On Au(111), Shyngaya et al 16 suggested that a mixture of sulfate and bisulfate ions are adsorbed based on the evolution of two bands at 1171 and 1044 cm -1 to 1246 and 1041 cm -1 for a more dehydrated overlayer. Again, the lack of a detailed isotopic study prevents an unequivocal assignment of the bands observed.…”

Section: Discussionmentioning

confidence: 99%

“…Vibrational studies of sulfate adsorbed on single crystal metal electrodes are reported for Pt(111) [6][7][8][9] , Pt(100) 10,11 , Pt(110) 12 , Au(111) 3,13 , Au(100) and (110) 14 and Rh(111) 15,16 . Single crystal surfaces constitute interesting model systems for the study of adsorbed sulfate, especially using in situ FTIR, since it permits to establish some correlation between the surface crystallography and the observed vibrational features.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

On the adsorption of sulfate on low Miller index Rh(hkl) electrodes: an in situ vibrational analysis

Moraes¹,

Nart²

2001

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

A adsorção de íon sulfato em eletrodos de Rh(111), Rh(100) e Rh(110) foi estudada utilizandose a técnica de espectroscopia de FTIR por reflectância in situ. Foi observada somente uma banda vibracional localizada acima de 1200 cm -1 para as três superfícies com baixo índice de Miller e uma banda fraca em 960 cm -1 para o sulfato adsorvido em Rh(111). A banda forte acima de 1200 cm -1 é dependente do potencial com uma variação de 50 cm -1 V -1 . Não foram observadas diferenças espectrais ao se variar a acidez da solução de forma a gerar soluções contendo sulfato ou sulfato ácido. Este resultado é interpretado em termos de uma dissociação completa dos íons, produzindo somente SO 4 2-adsorvido. A orientação da superfície afeta somente a quantidade de espécies sulfato adsorvidas. Parece que o mesmo tipo de adsorbato é encontrado em Rh(111), Rh(110) e Rh(100).The adsorption of sulfate ion on Rh(111), Rh(100) and Rh(110) electrodes was studied using in situ FTIR reflection spectroscopy. For wavenumbers above 1200 cm -1 , only one strong vibrational band is observed for adsorbed sulfate on the three low index rhodium surfaces. A weak band at 960 cm -1 is also observed for Rh(111). The strong band above 1200 cm -1 is potential dependent with a tuning rate of 50 cm -1 V -1 . No differences were observed upon changing the solution acidity in order to provide sulfate or bisulfate in solution. This result is interpreted in terms of complete dissociation of the ions, giving only adsorbed SO 4 2-. The surface orientation affects only the amount of the adsorbed sulfate species. It seems that the same adsorbed sulfate is present on Rh(111), Rh(110) and Rh(100).

show abstract

Section: Effect Of Solution Aciditysupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the adsorption of sulfate on low Miller index Rh(hkl) electrodes: an in situ vibrational analysis

Moraes¹,

Nart²

2001

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…61,[65][66][67][68][69][70][71][72][73][74] In general, these conclusions are based on the assumption that surface-bound anions (i.e., sulfate) possess a pK a value different from that of anions in solution, and therefore, the adsorbed species in the adlayer is not necessarily the dominant species from solution. Considering these possibilities, the whole picture becomes even more complex, especially taking into account that different sulfate species show rather specific affinity for the gold substrate and copper adlayer deposit.…”

Section: Copper Deposition Onto the Bare Au(111) Electrode Surface Wmentioning

confidence: 99%

New Insights into Evaluation of Kinetic Parameters for Potentiostatic Metal Deposition with Underpotential and Overpotential Deposition Processes

2000

View full text Add to dashboard Cite

Kinetics of copper deposition onto an Au(111) surface from sulfuric acid electrolyte, was evaluated using potentiostatic current transients. Measurements were conducted employing a new and nontraditional method, with gold electrode completely free from copper deposit at the beginning of the potential step (i.e., deposition process). The current transients obtained clearly show partial contribution from copper underpotential deposition (UPD) and copper overpotential deposition (OPD) processes. Quantitative evaluation of experimental transients was performed with the recently developed method for theoretical transient computer simulation. Detailed analysis of the kinetic parameters shows that copper UPD could be characterized as a two-dimensional nucleation and growth limited by the lattice incorporation (2D-LI) process and copper OPD as a three-dimensional nucleation process limited by diffusion-controlled growth (3D-DC). The UPD seems to be an inevitable part of the deposition process and takes place prior to OPD, regardless of the potential applied. Therefore, UPD should be treated as an early stage of the deposition process. Furthermore, our results show that the kinetics differs depending on whether deposition is initiated from a clean, bare Au(111) surface or from a gold surface already coated with a copper UPD adlayer. This indicates the role of the UPD process and the UPD adlayer on the course of OPD. Differences observed in deposition kinetics between electrolytic baths at pH 2 and 4 were likely due to adsorption of different sulfate species (sulfate or bisulfate anions) on the copper-deposit-modified Au(111) substrate (UPD, epitaxial monolayer) or bulk deposit adlayer (OPD).

show abstract

Electrocatalysis – Heterogeneous

Horányi

2002

Encyclopedia of Catalysis

View full text Add to dashboard Cite

The present article surveys the state of the art of electrocatalysis, laying stress on the present knowledge and understanding. The links between electrocatalysis and catalysis are analyzed, demonstrating the similarity of catalytic and electrocatalytic systems. Electrochemical methods for the characterization and preparation of catalysts are discussed. Results concerning electrochemical activation of catalysis are presented. Fundamental aspects of electrocatalysis are approached in terms of electrochemistry, analyzing the role of the nature and surface structure of the electrode/catalyst in electrocatalytic processes. Electrocatalytic hydrogenation/reduction processes are discussed in detail, with special attention to the reductive splitting of CO and COH bonds. Studies devoted to the electrocatalytic reduction of carbon dioxide are also considered with respect to the great practical importance of the transformation of CO 2 into useful organic materials and fuels. Results connected with the reductive dehalogenation of various halogenated derivatives are also presented as these compounds are among the most widespread pollutants of the environment. Importance of attempts devoted to the electrocatalytic reduction of anions, first of all to the reduction of nitrate, motivated by their relevance to pollution control is emphasized. Problems of electrocatalytic oxidation of small organic molecules (formic acid, formaldehyde, and methanol) are discussed in detail, considering the potential use of these molecules as fuels in direct fuel cells. Special attention is paid to the electrocatalytic oxidation of diols and polyols.

show abstract

Comparison of a bisulfate anion adsorbed on M(111) (M=Pt, Rh, Au, Ag and Cu)

Cited by 68 publications

References 33 publications

On the adsorption of sulfate on low Miller index Rh(hkl) electrodes: an in situ vibrational analysis

On the adsorption of sulfate on low Miller index Rh(hkl) electrodes: an in situ vibrational analysis

New Insights into Evaluation of Kinetic Parameters for Potentiostatic Metal Deposition with Underpotential and Overpotential Deposition Processes

Electrocatalysis – Heterogeneous

Contact Info

Product

Resources

About