Shapes of practical rotating disc electrodes

Characterization of the hydrodynamics inside a practical cell with a rotating disk electrode

“…A major concern in the early works was to verify that the hydrodynamic behavior assumed in the theory developed by Levich [3] was in agreement with the velocity field inside a cell where fluids of finite volume and electrodes of finite dimensions were being employed [1,4,5]. A precise experimental determination of the velocity field near the electrode through modern non-intrusive techniques such as Particle Imaging Velocimetry (PIV) becomes difficult due to cell geometry and electrode dimensions.…”

“…In early works devoted to electrochemical cells with RDE, several problems caused by using finite, practical electrodes were studied [5,[7][8][9]. In order to avoid edge effects, different electrode geometries were suggested in those works based on the knowledge about the hydrodynamic behavior inside the cell.…”

“…Electrochemical cells with a rotating disk electrode (RDE) are the preferred configurations to characterize electrochemical reactions [1][2][3][4][5]. The availability of analytical expressions for the velocity field and current density around the electrode are the most significant attributes of these cells [2].…”

Hydrodynamic Analysis of Electrochemical Cells

“…Azim and Riddiford (Azim & Riddiford, 1962) recommended conical or bell-shaped electrode designs. The effect of the electrode shape upon the rate of mass transfer was widely analyzed by Blurton and Riddiford (Blurton & Riddiford, 1965) and by Prater and Adams (Prater & Adams, 1966). However, in accordance with Prater and Adams: "... the difficulty of fabricating the bell-shaped electrode probably outweighs its advantages...".…”

Influence of Geometry and Velocity of Rotating Solids on Hydrodynamics of a Confined Volume

“…Thus, the geometry of the solid has been changed to fulfill the specific requirement of a process [8,9]. But, most of these modifications were based on the results obtained by the process itself and not by the investigation of the phenomenon.…”