Electrolytic salt water why use iron as a cathode, all with graphite can not?
From an economic point of view, the storage amount of iron is much larger than that of graphite, graphite iron is cheaper and easier to get.
When electrolyzed salt water is used, the cations in the solution (H+, ionized by H2O) are moved to the cathode by the electric field force, and electrons are generated at the cathode to produce H2 hydrogen, and the hydrogen H2 generated does not react with iron
Although iron and graphite can be used, it is better to use iron as the cathode: 1, because the cathode will be protected when it is electrolytic, that is to say, iron will be protected and will not lose electrons
The iron electrode is easier to be installed in the electrolytic cell, which is more convenient than the graphite electrode, and the density of the graphite is small. After being adsorbed by hydrogen, the graphite is easy to float up, and the density of the iron is larger. This problem does not exist in the.5
