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- W2038633607 abstract "The mechanism of iodide oxidation on platinum electrodes is investigated using laser-activated voltammetry under both channel flow and no flow conditions together with independent in situ atomic force microscopy (AFM) measurements. Laser activation using a 10 Hz pulsed Nd:YAG 532 nm laser is shown to remove bulk iodine from the electrode surface so that under sustained pulsed irradiation a steady-state surface evolves at which the iodide oxidation can be reproducibly studied. When the concentration and flow rate dependence of the voltammetric wave shape are modeled, the mechanism is shown to be the following: 2I- (aq) − 2e- ⇌ I2 (aq) (i); I2 (aq) + I- (aq) ⇌ I3- (aq) (ii); I2 (aq) ⇌ I2 (s) (iii); I- (aq) + I2 (s) → I3- (aq) (iv), where the formal redox potential for reaction i is 0.358 V vs SCE in 0.1 M H2SO4, the equilibrium constant for reaction ii is 580 M-1 with a forward rate constant of 1 × 105 mol-1 cm3 s-1, the solubility of I2 (reaction ii) is 1.85 × 10-3 M, and the heterogeneous rate constant for reaction iv is 1.6 × 10-3 cm s-1." @default.
- W2038633607 created "2016-06-24" @default.
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- W2038633607 date "1999-09-01" @default.
- W2038633607 modified "2023-10-18" @default.
- W2038633607 title "Laser-Activated Voltammetry. Mechanism of Aqueous Iodide Oxidation at Platinum Electrodes: Theory and Experiment" @default.
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- W2038633607 doi "https://doi.org/10.1021/jp991778d" @default.
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