Rotating-disc electrode studies of the anodic oxidation of iodide in concentrated iodine + iodide solutions

Understanding the role of Br− during the electrooxidation of I− in aqueous media: I2Br−(aq)‐formation without the precipitation of an iodine film

“…Nevertheless, there have only been a few studies that have made an effort toward fundamentally understanding the I 3 À (aq)/I À (aq) redox reaction in an aqueous solution mainly associated with its complicated electrochemical nature driven by an iodine film precipitated onto an electrode during the electrooxidation of I À due to its low solubility in water. [10][11][12][13][14][15][16] Recently, our group reported that a metastable iodine film could be conditionally generated in an I À -rich aqueous solution under a potential biased condition, where I À in the vicinity of an electrode was depleted by its electrooxidation. 17 Based on the newly developed electroanalytical approach by a rotating ring-disk electrode (RRDE), we could quantitatively monitor the formation and dissolution of an iodine film during a I 3 À (aq)/I À (aq) redox reaction occurring on a glassy carbon (GC) disk electrode.…”

Quantum Chemical Examination of the Sequential Halogen Incorporation Scheme for the Modeling of Speciation of I/Br/Cl-Containing Trihalomethanes

“…We hypothesize that this may be caused by the occurrence of a direct incorporation pathway (which is potentially distinct from the sequential three steps incorporation) in the cases of CH 2 l 2 and CHI 3 formation. These pathways can be possibly associated with the involvement of •I 2 and I 3 – species which have been observed to form in the halogenation-dehalogenation processes involving CHCl 2 I and CHI 3 . − Our prior electrochemical experiments also showed that I 2 and I 3 – could directly incorporate into organic matter by rotating ring-disk electrode (RRDE) and spectroscopy methods. , …”

Electrooxidation of Iodide Ion at Poly 8-(3-acetylimino-6-methyl-2,4- dioxopyran)-1-aminonaphthalene Modified Electrode in Aqueous Solution

“…16 The above results agree with that in literature, so precipitation-dissolution mechanism for the oxidation process at bare Pt electrode is still valid at PAMDAN /Pt modified electrodes. [13][14][15][16][17] For thicker film (20 scans), as shown in Figure 6, the 1 st oxidation peak disappears and only the 2 nd one appears at 0.58 V with decrease in its current. The broad cathodic peak appears at 0.28 V with some shoulders in it.…”

“…This is due to the presence of thick PAMDAN film on Pt electrode which hinders the diffusion of iodide ions to be oxidized at Pt surface. [13][14][15][16][17][21][22][23][24] It was found that the iodide ion concentration affects the redox response of the oxidation process. Figure 7 shows the cyclic voltamograms of the 0.01 M and 0.05 M KI.…”

“…Detailed studies on the formation, thickness, properties, growth and dissolution of the iodine film during the anodic oxidation of iodide have been performed. [13][14][15][16][17] Anodic oxidation of iodide is consecutive process; it consists of a series of elementary steps, such as the diffusion of iodide to the electrode, the discharge of iodide ions at the electrode, the complexing of the product iodine with I -(and I 3 -, etc. ), and the diffusion of iodine species from the electrode surface to the bulk solution.…”