There are various calibration methods for in-situ electrocatalytic reaction tanks, each with its own operating steps and precautions. Here are some common in-situ electrocatalytic reaction cell calibration methods:

1. Electrode position calibration

-Visual inspection and preliminary positioning: When installing electrodes, first observe with the naked eye to ensure that the working electrode, counter electrode, and reference electrode are in roughly correct positions, and that there is no obvious dirt or damage on the electrode surface. For example, for an in-situ electrocatalytic reaction cell with a three electrode system, the working electrode should face a specific window or detection area of the electrolytic cell, and the counter electrode and reference electrode should also be located in appropriate positions to avoid mutual interference.

-Fine tuning electrode position: Use an electrode holder or fine-tuning device to precisely adjust the position of the electrode. The electrodes can be adjusted to the optimal position by measuring parameters such as the distance between the electrodes and the relative position of the electrode electrolyte interface. For example, in some high-precision in-situ Raman spectroscopy electrocatalytic reaction cells, it is necessary to precisely control the coincidence of the working electrode and the focal point of the Raman spectrum to obtain the optimal spectral signal.

2. Electrolyte level calibration

-Liquid level height inspection: Ensure that the electrolyte level is at the appropriate height, which can submerge the electrode without causing overflow. Generally speaking, the electrolyte level should be slightly higher than the surface of the electrode to ensure good contact between the electrode and the electrolyte. During the operation, the liquid level can be checked regularly, and if it drops, the electrolyte should be replenished in a timely manner.

-Exclude bubbles: Bubbles may exist in the electrolyte, which can affect the contact area between the electrode and the electrolyte, leading to measurement errors. During the calibration process, it is necessary to eliminate bubbles in the electrolyte, which can be removed by introducing inert gas (such as nitrogen) or using ultrasonic vibration.

3. Current and voltage calibration

-Open circuit voltage measurement: After connecting the electrode and electrolyte, without applying any external voltage, measure the open circuit voltage between the working electrode and the reference electrode. If the open circuit voltage is not within the expected range, it may be caused by impurities on the electrode surface, electrolyte contamination, or poor electrode connection, and inspection and treatment are needed.

-Current zero calibration: Set the electrochemical workstation or other measuring equipment to current measurement mode and measure the current value without applying voltage. If the current is not zero, it indicates that the equipment may have zero drift or leakage issues and needs to be calibrated. This issue can be resolved by adjusting the zero point setting of the device or checking the circuit connections.

-Voltage scanning range calibration: Set an appropriate voltage scanning range according to experimental requirements. Before conducting a voltage scan, perform a small-scale pre scan to observe if the current response is normal. If abnormal current response is found, it may be due to an unreasonable voltage scanning range setting or irreversible electrochemical reactions occurring on the electrode surface, requiring readjustment of the voltage scanning range or replacement of the electrode.

4. Spectral calibration (for in-situ spectral electrocatalytic reaction cell)

-Wavelength calibration: If the in-situ electrocatalytic reaction cell is equipped with a spectroscopic system (such as in-situ Raman spectroscopy, in-situ infrared spectroscopy, etc.), wavelength calibration of the spectrometer is required. The wavelength accuracy of the spectrometer can be calibrated using standard light sources or reference materials with known wavelengths to ensure the accuracy and reliability of the measured spectral data.

-Optical path alignment: Adjust the optical path between the light source, spectrometer, and reaction cell to accurately illuminate the working electrode and be received by the spectrometer. The alignment of the optical path can be determined by observing the intensity and stability of the spectral signal, and adjustments can be made if necessary.