Another interesting field of utilizing molecularly functionalized electrode surface focuses on introducing spatial and temporal control in polymerization reactions. Switchable catalysis can be achieved by electrochemically altering the oxidation state of a catalytically active metal center. Electrochemically control of molecular catalysts in switchable polymerization has been reported for atomic transfer radical polymerization (ATRP), 141 cationic polymerizations, 142 and ring-opening polymerizations. The selective application of an electrical stimulus to trigger redox events on a redox-active metal complex provides an alternative way to chemically controlled redox events. In particular, electrochemical control in redox-switchable polymerization reactions alleviates the need for additional chemicals in these processes. It further enables multiple switches when possible. Switching between reductive and oxidative potentials allows on/off control of the polymerization process, control over molecular weights and dispersity, as well as over the stereochemistry and composition of the polymer chain. . Enabling surface-initiated polymerization by immobilizing redox-active metal complexes onto an electrically addressable surface with the selective application of an electrical stimulus would allow electrochemical control to afford valuable polymeric materials. One could expect that the combination of electrochemistry associated with the solid support and molecular properties of the metal complex should evolve the field of switchable polymerization.