Rotating disk voltammetry experiment

Abstract

The experiment described is designed to acquaint the graduate or advanced undergraduate student with the theory and application of rotating disc electrode method.

Gastight Hydrodynamic Electrochemistry: Design for a Hermetically Sealed Rotating Disk Electrode Cell

“…(b) A Levich plot of the average RDEV current densities at 0.8 V vs Ag/AgCl as a function of the square root of the rotation rate. The measurements from the hermetically sealed RDE cell are compared to those taken in conventional RDE cells in this report, previously reported values, and the calculated Levich response from eq .…”

“…The mass transport of Fe(CN) 6 4-can be modeled by the Levich equation, 21 where the limiting plateau current, i L at a given rotation rate is given by:…”

Cobalt-Doped Ba2In2O5 Brownmillerites: An Efficient Electrocatalyst for Oxygen Reduction in Alkaline Medium

“…It is clear from the figure that the limiting current density increases with increase in the rotation rate of the electrode; this can be attributed to the enhanced rate of mass transport at a higher electrode rotation rate. 37 Additional information such as number of electrons ( n ) involved in the ORR was determined by the Koutecky–Levich (K–L) equation 38 where “ j ” is the disk electrode current density, “ k ” is the reaction rate constant, “ n ” is the number of electrons exchanged per O 2 molecule, “ F ” is the Faraday constant (96 500 C mol –1 ), “ C O 2 ” is the bulk oxygen concentration (1.2 × 10 –6 mol L –1 ), “ D O 2 ” is the diffusion coefficient of molecular oxygen in 0.1 mol L –1 KOH solution (1.9 × 10 –5 cm 2 s –1 ), “ν” is the kinematic viscosity of the electrolyte (0.01 cm 2 s –1 ), and “ω” is the electrode rotation speed in radians per second (=2π f = 2πrpm/60). A plot of the inverse of current ( i –1 ) as a function of the inverse of the square root of the rotation rate (ω –1/2 ), which is known as the K–L plot, is a useful method to analyze the ORR kinetic parameters of an electrocatalyst.…”

Development of an electroanalytical method for the quantification of aminopyrine in seized cocaine samples

“…where I L is the limiting current (A), n is the number of electrons transferred (mol −1 ), A is the electrode area (cm 2 ), C is the solution concentration (mol cm − 3 ), D is the diffusion coefficient (cm 2 s − 1 ), F is the Faraday constant, 96.485 C, υ is the kinematic viscosity (cm 2 s −1 ), and ω is the angular rotation rate of the electrode (rad s −1 ). Hence, information about electrochemical mechanisms at the surface of the electrode and causes leading to deviations of the experimental currents from the Levich equation are amenable to study with the RDE [19,20]. Hydrodynamic voltammograms were recorded with different rotational speeds of the electrode between 100 and 6400 rpm, as shown in Fig.…”