Does the subject want to ask "What are the types and structures of metal-based electrodes"? Three types of electrodes and structures. Metal-based electrodes can be divided into four types: the first type electrode, active metal electrode, the second type electrode, also known as metal-insoluble salt electrode (MúMXn), and the third type electrode, Mú(MXNXN). There are three types and structures of metal-based electrodes. Zero electrode inert metal electrode, metal-based electrode structure, bulk electrode, combined structure and assembly structure.