mmo coating titanium cathode Mixed metal oxide coated titanium anode, also known as DSA (Dimensionally Stable Anode), also known as DSE anode. This titanium anode is a new type of insoluble anode material developed in the late 1960s. The titanium substrate is coated with a layer of precious metal oxide (MMO) through a special process to make it have good electrocatalytic activity and conductivity.