Rotating ring electrodeRRDE is an electrochemical research device that combines fluid dynamics principles, consisting of concentric disks and peripheral circular electrodes separated by a small gap. It generates forced convection through rotation, measures the current density distribution on the electrode surface, eliminates diffusion layer interference, and can detect reaction intermediates to study reaction mechanisms.
Key Features:
The rotating electrodes are connected through silver carbon brushes to achieve signal output/input, and each disk and ring has two silver carbon brushes to provide reliable and stable connections.
The host has dual functions of RDE and RRDE, and the speed can be manually controlled.
The speed control adopts a closed-loop design with a built-in speed measurement device to ensure that the actual speed is consistent with the set speed.
Adopting a humanized design, it is convenient to install and replace electrode rods and carbon brushes. The electrodes are easy to rinse, clean, and replace, making it very easy to move and replace the electrolytic cell.
Inspection and calibration methods for platinum electrodes:
Calibrating a platinum electrode typically requires using it in conjunction with a reference electrode of known potential (such as a saturated calomel electrode) and inserting it into a standard solution for verification.
Electrode connection: Connect the platinum electrode to the positive electrode of the instrument, and connect the reference electrode (such as a saturated calomel electrode) to the negative electrode of the instrument.
Standard solution test: Insert these electrodes into a standard solution with a fixed potential. For example, a standard solution of ferrous ammonium nitrate and ferric ammonium sulfate can be used, with a standard oxidation-reduction potential of+430mV at 25 ℃.
Result comparison: Read the measured potential value displayed by the instrument. If the deviation between the measured result and the standard potential value (+430mV) exceeds ± 10mV, it indicates that the platinum electrode needs to be re purified or replaced.
Principle for determining calibration cycle:
When determining the calibration cycle, two key factors need to be balanced: first, to ensure that the risk of the instrument exceeding the allowable error within the cycle is minimized; The second is to make the calibration cost economically reasonable. After the initial calibration of the instrument, the calibration cycle can be gradually extended, but the longest should not exceed 5 years, and periodic checks should be arranged during this period. If the instrument is found to be unstable, it needs to be recalibrated.