A rotating tungsten disc electrode in concentrated strong alkaline solutions: An electroanalytical aspect

Switching between voltammetry and potentiometry in order to determine H+ or OH− ion concentration over the entire pH scale by means of tungsten disk electrode

“…In addition, successive potential cycling in the region more negative relative to that at which surface oxidation may take place, removes the oxide layer, as evidenced by means of oxygen reduction reaction on W electrode in alkaline solutions [37]. In our recent paper [31] it was published that metallic W electrode can be applied for direct hydrodynamic amperometric detection of OH À ions concentration within the range 1-100 Â 10 À3 mol dm À3 . Direct relationship between limiting anodic current (j L ) in the region of anodic dissolution was confirmed in both potentiostatic and potentiodynamic regimes.…”

“…where the factor A depends on the kinematic viscosity and the ionic strength of the solution [31]. In contrast to the voltammetry of H + where no sample contamination risk exists, this might be problem when amperometry of OH À ions is performed using W electrode due to tungsten dissolution, and the proposed method is the more feasible when certain amount of the sample can be sacrificed.…”

“…Dimitrakopoulos et al evidenced that the interferences with dissolved O 2 affected the sensitivity of tungsten oxide in pH measurements [27]. Another analytical application of metallic W electrode was recently reported by our group [31], relating to the applicability of W disk electrode for hydrodynamic amperometric detection of OH À ions in the concentration range between 10 À3 mol dm À3 and 0.1 mol dm À3 . The method is based on the linear relationship between the concentration of OH À ions and the limiting current density of anodic dissolution of tungsten.…”

Evaluation of the electrocatalytic properties of Tungsten electrode towards hydrogen evolution reaction in acidic solutions

“…This is due to its superior electronic conductivity [41] that makes it significant candidate for electrocatalytic HER. The disadvantages of H2O alkaline electrolysis processes are mainly related to their low efficiency and high energy consumption [42][43].…”