Glassy carbon electrode; One-step treatment of solid electrode surface is mechanical grinding and polishing to mirror level, especially when there is an inert layer or strong adsorption layer on the electrode surface, it must be treated by mechanical or heating methods.
Materials commonly used for polishing electrodes are corundum, CeO2, ZrO2, MgO, and α-powder. When polishing, always grind in the order of the smaller particle size of the polishing agent.
During the experiment, the glassy carbon electrode with a diameter of 3mm was polished step by step with metallographic sandpaper (1#~7#), and then polished to the mirror surface with 1.0 and 0.3μm slurry on the suede, and polished each time after cleaning. Remove surface dirt, then move into the ultrasonic water bath for cleaning, 2~3min each time, repeat 3 times, and finally use 1:1 ethanol, 1:1, and distilled water for ultrasonic cleaning.
After a thorough cleaning, activate the electrode by cyclic voltammetry in a 0.5-1mol/L solution, the scanning range is 1.0~-1.0V, and scan the electrode repeatedly until stable cyclic voltammetry is achieved.
Finally, the cyclic voltammetry curve of 1×10-3mol/L K3Fe(CN)6 solution in 0./ was recorded to test the performance of the electrode. The scanning speed is 50 mV/s, and the scanning range is 0.6~-0.1V. The electrode can only be used when the peak potential difference in the cyclic voltammogram obtained under laboratory conditions is below 80mV and as close as possible to 64mV, otherwise, the electrode must be reprocessed until it meets the requirements.
Graphite electrode is a kind of conductive material with high-temperature resistance and oxidation resistance, which is made of petroleum coke as aggregate and coal tar pitch as binder through a series of processes such as crushing, batching, kneading, molding, roasting, and impregnation. , graphitization, and machining.
Graphite electrodes have good electrical properties and chemical stability, high mechanical strength at high temperatures, low impurity content, and good vibration resistance. It is a good conductor of heat and electricity.
Widely used in electric arc furnaces for steelmaking, refining furnaces, submerged arc furnaces for producing ferroalloys, industrial silicon, yellow phosphorus, corundum, and other melting furnaces that use electric arcs to generate high temperatures.
According to the different power and current during use, different raw materials and production processes are used to produce and can be divided into ordinary power graphite electrodes, high power graphite electrodes, and ultra-high power graphite electrodes. According to the diameter of the electrode, there are different specifications of φ75~.
According to the special requirements of users, graphite electrodes and special-shaped graphite products of special specifications can be processed and produced. A glassy carbon electrode can be used when performing stripping voltammetry in the relative positive potential range.