Rotating disk electrode RDE

The working principle of the rotating disk electrode RDE is based on the control of material transfer and current density by electrochemically active substances, and the movement of these electrochemically active substances is carried out according to the laws of fluid dynamics.

The rotating disk electrode RDE, as an important electrochemical research tool, has played a role in the field of electrochemistry since its inception. Here is a detailed introduction:

1、 Working principle

The working principle of the rotating disk electrode RDE is based on the control of material transfer and current density by electrochemically active substances, and the movement of these electrochemically active substances is carried out according to the laws of fluid dynamics. During the high-speed rotation of the electrode, substances in the solution are forced to flow to the electrode surface, thereby accelerating the reaction rate on the electrode surface. This forced convection effect helps to reduce or eliminate the influence of diffusion layers on electrochemical reactions, making measurement results more accurate.

2、 Basic Structure and Characteristics

1. Structure: The main part is a high-speed rotating disk that is concentric with the axis perpendicular to it and has good axial symmetry. The disk is usually covered with a certain thickness of insulation layer to reduce edge effects in fluid dynamics.

2. Characteristics: The roughness of the electrode surface is much smaller than the thickness of the diffusion layer, which enables effective control of material transfer and current density on the electrode surface. In addition, there is a clear functional relationship between the diffusion layer thickness of reactants at the electrode solution interface and the electrode rotation speed, so the mass transfer of reactants and products can be regulated by changing the electrode rotation speed.

3、 Advantages and Improvements

The main advantage of rotating disk electrode RDE is that it can regulate the mass transfer of reactants and products by changing the electrode rotation speed, thereby achieving control over electrochemical reactions. In addition, with the advancement of technology and the deepening of research, continuous improvement and innovation are also being carried out. For example, the rotating ring disk electrode is a further development based on this device, which can simultaneously collect current signals from both the disk electrode and the ring electrode, providing richer information for electrochemical research.

4、 Application Fields

Widely applicable in multiple fields:

1. Electrochemical analysis: used to measure the rate of electrochemical reactions, mass transfer characteristics, and species concentration in solutions, providing a powerful tool for electrochemical analysis.

2. Corrosion research: By using metal samples as working electrodes and exposing them to corrosive media in the form of rotating disks, the corrosion resistance and corrosion kinetics parameters of materials are evaluated.

3. Energy Conversion: In fuel cell research, evaluating the performance of fuel cell catalysts, oxygen reduction reaction kinetics, and proton conduction provides support for the development of fuel cells.

4. Environmental monitoring: It can be used to monitor changes in environmental parameters such as atmosphere and water quality in real time, providing data support for environmental protection.

5. Materials Science: In processes such as electrodeposition, electric brush plating, anodizing, etc., the uniformity of film formation, grain size, and other characteristics of materials are controlled by controlling the electrode rotation speed, thereby optimizing the performance of materials.

5、 Technical parameters:

The higher speed is 3000RPM, and the collection rate is 37%

Ring disk spacing: 320um Operating temperature: 10-25 ℃

Disk area: 0.2475CM2

Ring area: 0.1866CM2 glassy carbon disk electrode outer diameter: 5.61mm

Outer diameter of platinum ring: 7.92mm Inner diameter of platinum ring: 6.25mm

Disk material: Glass carbon ring material: Platinum

In summary, the rotating disk electrode RDE plays an important role as an electrochemical research tool in various fields such as electrochemical analysis, corrosion research, and energy conversion. With the continuous development of technology, its application prospects will become even broader.