2006
DOI: 10.1021/jp055714g
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Kinetic Effects of Alcohol Addition on the Anodic Behavior of Silicon in Acid Fluoride Media

Abstract: The anodic dissolution of silicon in acid solutions of ammonium fluoride is investigated in aqueous and water-alcohol media by rotating disk voltammetry and impedance spectroscopy. The voltammograms recorded in water-alcohol media show, in comparison to water, the following effects: an increase of the dissolution currents measured at pH>2 and an opposite effect at pH<2; a distortion of the curve, with a relative increase of the characteristic currents in the region of low applied potentials, indicating easier … Show more

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Cited by 3 publications
(3 citation statements)
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“…7 are obtained. On this basis, a simple qualitative explanation of the main experimental findings is possible: ͑i͒ under polarization, protons are produced at the electrode surface in Reactions 2 and 4 and cause a local pH decrease; ͑ii͒ due to chemical equilibria ͑Reactions 5 and 6͒, an increase in the concentrations of HF and HF 2 − results; these species attack and dissolve the TiO 2 surface in a reaction similar to that valid for SiO 2 , 12,13 producing, e.g., fluoride complexes…”
Section: Electrode Reactions and Acid-basementioning
confidence: 92%
“…7 are obtained. On this basis, a simple qualitative explanation of the main experimental findings is possible: ͑i͒ under polarization, protons are produced at the electrode surface in Reactions 2 and 4 and cause a local pH decrease; ͑ii͒ due to chemical equilibria ͑Reactions 5 and 6͒, an increase in the concentrations of HF and HF 2 − results; these species attack and dissolve the TiO 2 surface in a reaction similar to that valid for SiO 2 , 12,13 producing, e.g., fluoride complexes…”
Section: Electrode Reactions and Acid-basementioning
confidence: 92%
“…On this basis a simple qualitative explanation of the main experimental findings is possible: (i) under polarization, protons are produced at the electrode surface in Reactions [2] and [4] and cause a local pH decrease; (ii) due to chemical equilibria (Reactions [5] and [6]), an increase in the concentration of HF and HF 2 results; these species attack and dissolve the surface TiO 2 in a reaction similar to that valid for SiO 2 (12,13), producing, e.g., fluoride complexes…”
Section: Electrode Reactions and Acid-base Equilibriamentioning
confidence: 94%
“…This is due to the fact that on diluting the HF acid, the dissociation of hydrogen bonds present in the concentrated hydrofluoric acid, 35 contributes to an enhanced availability of fluoride ions attacking the silicon anode. Therefore, one can deduce that the amount of the internal noise is regulated by the concentration of the fluoride ions in the electrolyte solution.…”
mentioning
confidence: 99%