Effect of Anions on the Kinetics of Tris(1,10-phenanthroline)-cobalt(II)/(III) Redox-Electrode Reaction on a Platinum (111) Single Crystal Electrode

Improvements in the Efficiency of the Oxidation of Formic Acid Obtained by Increasing the Overall Anion Adsorption Strength

“…Decreases in the upper limit for water adsorption followed the trend given by anion adsorption strengths; the largest limit was obtained when the perchlorate ion was the major anion in solution, and the smallest limit was obtained when the chloride ion was the predominant anion in solution. The rate constants for a redox reaction were found to decrease in the presence of halide anions . The decrease follows the increase in adsorption strength of halide anions, F - < Cl - < Br - .…”

“…The effect of the electrolyte's anion composition on electrochemical processes at metal electrodes is a large research area. − Early studies of anion adsorption 1,2 provided important information, such as isotherms, which represent anion surface concentrations as a function of potential. Later studies provided more detailed, specific information about anion adsorption, much of which was obtained using modern and/or improved methods.…”

An Experimental and Theoretical Study of Interactions between Unlike Surface Anions and Increases in the Rate of Electrochemical Reactions

“…Many studies have exposed the large extent to which anions affect electrochemical reactions. − In a study on the electrochemical oxidation of methanol, it was found that the effects of anions are comparable to the effects of surface geometry. In another study on methanol oxidation, the adsorption of anions decreased the current in a potential range where previously it was believed oxide formation was responsible for the inhibition.…”

“…Considerable research supports the theory that the effects of anions on electrochemical reactions originate from their adsorption and subsequent blocking of surface sites. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Surface anions inhibit reactions requiring vacant sites. A study of the oxidation of methanol at polycrystalline Pt is consistent with this picture.…”

“…The trend in the oxidation currents follows the trend given by "anion adsorption strengths" which are ordered as 4 A large number of results in the literature follow the trends in anion adsorption strength and the competition for surface sites. [5][6][7][8][9][10][11][12][13][14][15][16] Because the inhibitory properties of anions are well established, it is easy to conclude that the dominant interactions of an adsorbed anion are with the atoms of the electrode surface. In this paper, an experimental and theoretical study is presented on the increase in the rate of electrochemical reactions that is seen when a fraction of the original supporting electrolyte is replaced by more inhibiting ones.…”