Electrodeposition of fluorine-doped lead dioxide

The electrocatalytic properties of PbO₂ may be increased by incorporation of some ions such as F⁻. In this review, the preparation of fluorine-doped PbO₂ in the presence of some additives of fluorine-containing compounds (F⁻, potassium salt of nonafluoro-1-butanesulfonic acid C₄F₉O₃SK and Nafion^®) is reported. The mechanism of electrodeposition is discussed. The amount of additives in the deposit depends on the experimental conditions: potential, current density and charge of additive species in the plating solution. The physicochemical properties of doped oxide are very different from those of undoped oxide, accounting for the different electrocatalytic activity of the materials.     

Electrodeposition of composite PbO2–TiO2 materials from colloidal methanesulfonate electrolytes

Journal of Solid State Electrochemistry - The influence of particles of colloidal titanium dioxide on the morphology and structure of lead dioxide electrodeposits has been investigated. The...     

New Approaches to the Creation of Nanocomposite Anode Materials Based on PbO2: A Review

Theoretical and Experimental Chemistry - An original approach to the creation of new nanocomposite anode materials based on PbO2 and to the processes of composite formation due to the influence of...     

Electrochemical properties of Ebonex®/Pt anodes

The electrochemical behavior of platinized Ebonex® was studied. The electrochemical and semiconductor properties of electrodes can be varied within wide limits by thermal treatment of Ebonex®/Pt, which selectively affects the electrocatalytic activity of anodes in the oxygen evolution reaction. The reduction peak of platinum oxides on the cyclic voltammetry (CV) curves can be used as a correlation parameter when evaluating the electrocatalytic activity of Ebonex®/Pt electrodes in the oxygen evolution reaction.     

Oxygen evolution on lead dioxide modified with fluorine and iron

In the oxygen evolution reaction in a sulfuric acid solution, the electrocatalytic activity of lead dioxide doped with fluorine or iron changes. At low and elevated dopant concentrations, the reaction rate is limited by the transfer of the second and first electrons, respectively. Dedicated to the ninetieth anniversary of Ya.M. Kolotyrkin’s birth.     

Anodic oxidation of Cr3+ ions in a chromium electroplating bath on Pt and composite TiO x /PtO y

The effect of various factors (anodic current density, composition of electrolyte, electrode material) on current efficiency of the anodic reaction of formation of Cr(VI) ions is established on Pt and composite TiO _x /PtO _y under electrolysis of solutions containing Cr³⁺ ions. It is shown that the current efficiency values of Cr(VI) on TiO _x /PtO _y decrease at an increase in the active layer thickness and increase in the electrode treatment temperature. It is found that the major part of Cr(VI) compounds formed on the anode is reduced on the cathode and as a result of homogeneous chemical reactions in the bulk of electrolyte.     

Electrodeposition of PbO<Subscript>2</Subscript>-ZrO<Subscript>2</Subscript> composite materials

The regularities of electrodeposition of composite materials based on PbO₂ containing zirconium dioxide particles are studied. The contents of various phases in the composite depend on the electrolyte composition and conditions of deposition. When a dispersed phase is incorporated into the composite coating, the dimensions of lead dioxide crystals decrease to submicrons.     

Nitrite oxidation on RuO<Subscript>2</Subscript> electrodes

An electrochemical kinetic investigation of nitrite oxidation to nitrate on RuO₂ is discussed. The process is studied by cyclic voltammetry, steady-state measurements and potential step measurements. The overall oxidation reaction is a two-electron process where the first step involves a reversible charge transfer: NO₂⁻ ⇔ NO₂ + e⁻ The one-electron oxidation of nitrite yields adsorbed NO₂ which is further oxidized to adsorbed (NO₂)⁺ and subsequently desorbed via a chemical reaction. In the general case, fit of experimental data is obtained with adsorption described by a Temkin isotherm unless the electrode is pre-treated at a cathodic potential where the (NO₂)_ads is removed. This treatment lowers the degree of coverage by intermediates but not the nature of the slow step. Published in Russian in Elektrokhimiya, 2008, Vol. 44, No. 1, pp. 142–149. The text was submitted by the authors in English.     

PbO<Subscript>2</Subscript>-TiO<Subscript>2</Subscript> composites: Electrosynthesis and physicochemical properties

Fundamental aspects of electro deposition of PbO₂-based composites containing titanium dioxide particles were studied. The content of the dispersed phase in the composite depends on the electrolyte composition and deposition conditions. Incorporation of titanium dioxide particles into PbO₂ leads to significant changes in the morphology and structure of the deposit.