Adsorption of Organic Compounds on Electrodes

Дамаскин, Б. Б.; Петрий, О. А.; Батраков, В. В.; Uvarov, E. B.; Parsons, Roger; Barradas, R.G.

doi:10.1149/1.2404464

Cited by 138 publications

(27 citation statements)

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“…1, the magnitude of the capacities was a little lower than the data of Schmid and Hackerman, and the shape was close to the results of a (110) face single-crystal gold electrode for 0.1M of the acid (11). The differential capacity data of the saturated PPA solution (0.04M) were calculated by the straight line relationship between logarithmic concentration of an adsorbed substance and its capacity (12). The calculated differentim capacities were used as the ones of full coverage.…”

Section: Resultssupporting

confidence: 72%

Adsorption of 3‐phenyl‐1‐propanol on Gold Electrode from Perchloric Acid Solutions

Katoh

Koseki

1984

J. Electrochem. Soc.

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Adsorption parameters of 3-phenyl-l-propanol and some other co-phenyl alkanols were calculated after the isotherm of 0/(1 -O)" = Kad~' Xorg. The adsorption peaks appeared at 0.70 and 0.35V (vs. SCE) for the adsorbate. The peak near 0.70V seems to be due to ~r-electron interaction of the benzene ring and another peak at 0.35V to the alcohol group as side chain. The peak height of coverage-potential curve at 0.35V became larger depending upon the number of carbon atoms in the aliphatic alcohol group on the benzene ring. The differential capacity was measured by a rapid rectangular single-pulse technique, and the voltage-time curve was memorized electrically set by a "Wave Memory." Then, the reproducibility of the_capacity measurement became approximately within -+6%. The values of n and the standard free energy of adsorption (AG ~ of the adsorbate at 0.70V were calculated as 2.8 and -7.4 kcal/mol, respectively.In the adsorption of benzene compounds on electrode surface, the ~-electron interaction between the adsorbed molecule and the electrode surface plays a dominant role (1). As reported in a previous paper (2), the adsorption peak of benzoic acid appears at 0.60V (vs. SCE), and the peak seems to be due to adsorption of benzene ring by its ;~-electron interaction on the gold electrode. In this report, adsorption of 3-phenyl-l-propanol (PPA) on gold electrode was studied. The adsorption peak was found at 0.70V. However, we found out that the new peak appeared at 0.35V. Peak height of the coverage-potential curve became larger depending upon the number of carbon atoms in the aliphatic alcohol group on the benzene ring from the coverage data of benzyl alcohol, 2-phenyl ethanol, and 3-phenyl-l-propanol. Kinetic parameters were calculated after the concept of competitive adsorption by Bockris and Swinkels (3, 4), Dahms and Green (5), and Conway and Dhar (6). They assumed that one molecule of an organic substance took the place of n molecules of water on the electrode surface. Lawrence and Parsons (7) calculated the n value from the geometrical ratio of the area occupied by the organic molecule to the one by water molecule. Dahms and Green (5) calculated the value for adsorption of aromatic hydrocarbons on gold electrode with radiotracer technique. ExperimentalGold electrode.--The gold electrode which was used as the working electrode which was made from polycrystalline pure gold (99.99%, Tokuriki Manufacturing Company Limited) and was sheathed in a Teflon rod (2). The electrode surface was polished before each series of electrochemical works with very fine emery papers and then polished with dilute suspension of 600 mesh dichromium trioxide polishing powder. The electrode surface was reduced by setting the potential near --0.20V for 20 min or more. The surface condition of the reducing process was observed by drawing a cyclic voltammetric curve of the gold electrode. The apparent surface area of the electrode was 0.049 cm 2, and the roughness factor as calculated with the method of Brummer and Makrides (8) wa...

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Section: Resultssupporting

confidence: 72%

Adsorption of 3‐phenyl‐1‐propanol on Gold Electrode from Perchloric Acid Solutions

Katoh

Koseki

1984

J. Electrochem. Soc.

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“…However, we can expect that the binding of nonpolar, organic molecules on an electrode surface reduces the Cdl value. 19 Although we have demonstrated positively the possibility of impedimetric immunosensing by using a modified gold electrode, the results presented here need to be supplemented with further investigations. One of the major problems is the variation of impedance according to the preparations of the modified electrode.…”

Section: Application To Impedimetric Immunosensormentioning

confidence: 83%

Electrode Modification by Long-Chain, Dialkyl Disulfide Reagent Haying Terminal Dinitrophenyl Group and Its Application to Impedimetric Immunosensors

et al. 1993

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A long-chain, dialkyl disulfide having a terminal dinitrophenyl (DNP) group was newly synthesized for modification of a surface of gold with chemisorbed, self-assembled organic monolayers. The resulting monolayer was characterized by infrared spectroscopy of reflection absorption spectroscopy mode, by cyclic voltammetric measurement and by electrical impedance measurement. Coupled with impedance measurements, a possible application of the modified electrode system to impedimetric immunosensors was demonstrated. The sensor gave electrical response to anti-DNP antibody at 10 -103 ng cm-3 concentration.

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“…Aiola, B.B. Damaskin [27,28], the value of activation energy less than 80 kJ/mol and even smaller than 5 kJ/mol represents physical adsorption. Hence, in the present observation, a considerably lower value of E a in the inhibitor is the indication of inhibitory effect of inhibitor through physical adsorption.…”

Section: Potentiostatic Polarization Studiesmentioning

confidence: 99%

The Inhibitory Effect of Diethanolamine on Corrosion of Mild Steel in 0.5 M Sulphuric Acidic Medium

Singh¹,

Bhrara²,

Singh³

2007

Port. Electrochim. Acta

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The inhibitory effect of diethanolamine (DEA) on corrosion of mild steel in 0.5 M H 2 SO 4 was investigated by various corrosion monitoring techniques. Galvanostatic polarization study revealed that this compound is a very good inhibitor. The inhibition efficiency (I%) varies in the range of 88.7% to 55.3 % for a concentration range of 10 -3 M to 10 -7 M at 303 K, respectively. A study of corrosion potential (E corr ) reveals that DEA is a mixed type inhibitor. DEA inhibited mild steel corrosion due to physical adsorption of the inhibitor on the metal surface. The study at higher temperatures indicates that the inhibition efficiency decreases with the increase in temperature. The adsorption of DEA on the mild steel surface in 0.5 M H 2 SO 4 follows the Frumkin's adsorption isotherm. The results of potentiostatic polarization study revealed that DEA is a strong passivating additive. The results of infra red (IR) spectroscopy, scanning electron microscopy (SEM) and quantum chemical study supplement the results of the electrochemical techniques.

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Adsorption of Organic Compounds on Electrodes

Abstract: not Available.

Cited by 138 publications

References 0 publications

Adsorption of 3‐phenyl‐1‐propanol on Gold Electrode from Perchloric Acid Solutions

Adsorption of 3‐phenyl‐1‐propanol on Gold Electrode from Perchloric Acid Solutions

Electrode Modification by Long-Chain, Dialkyl Disulfide Reagent Haying Terminal Dinitrophenyl Group and Its Application to Impedimetric Immunosensors

The Inhibitory Effect of Diethanolamine on Corrosion of Mild Steel in 0.5 M Sulphuric Acidic Medium

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