Electrooxidation mechanism of glyoxylic acid on Au polycrystalline electrodes in acidic medium

Ocón, P.; Velasco, Jaime González

doi:10.1002/bbpc.19981020809

Cited by 2 publications

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

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

Electrocatalysis – Heterogeneous

Horányi

2002

Encyclopedia of Catalysis

View full text Add to dashboard Cite

show abstract

Theoretical and Spectroelectrochemical Studies on the Adsorption and Oxidation of Glyoxylate and Hydrated Glyoxylate Anions at Gold Electrodes

et al. 2010

View full text Add to dashboard Cite

The adsorption of anions from glyoxylic acid solutions at gold electrodes has been studied by cyclic voltammetry and in situ infrared (external reflection and ATR-SEIRAS) and Raman (SERS) spectroscopies using both Au(111) single crystals and sputtered gold thin-film electrodes. In addition, theoretical harmonic IR frequencies and intensities of glyoxylate (HCOCOO -) and hydrated glyoxylate (gem-diol, HC(OH) 2 COO -) species adsorbed with different geometries on Au(111) clusters have been obtained from B3LYP/LANL2DZ, 6-31+G(d) calculations. Although only hydrated glyoxylate anions have been detected in the glyoxylic acid-containing solutions, the ATR-SEIRA spectra in conjunction with density functional theory (DFT) calculations have demonstrated the existence of both adsorbed glyoxylate and hydrated-glyoxylate anions on the gold surfaces. The ratio between the coverages of these two adsorbates depends on the glyoxylic acid concentration in solution, the relative glyoxylate coverage increasing when the glyoxylic acid concentration increases. The theoretical and experimental results have confirmed bidentate bonding of the anions with their OCO plane perpendicular to the metal surface. Furthermore, the in situ infrared data have shown the formation of adsorbed (bi)oxalate and formate as intermediates in the oxidation of glyoxylate and hydrated glyoxylate to carbon dioxide. The presence of adsorbed formate has been confirmed by the SERS spectra, whereas external reflection infrared experiments have shown the formation of carbon dioxide.

show abstract

Electrooxidation mechanism of glyoxylic acid on Au polycrystalline electrodes in acidic medium

Cited by 2 publications

References 18 publications

Electrocatalysis – Heterogeneous

Electrocatalysis – Heterogeneous

Theoretical and Spectroelectrochemical Studies on the Adsorption and Oxidation of Glyoxylate and Hydrated Glyoxylate Anions at Gold Electrodes

Contact Info

Product

Resources

About