Molecular electrocatalysts can exhibit surprisingly high activities and selectivities that are unmatched by most heterogeneous catalysts. Therefore, the development of robust immobilization strategies for these molecular species on electrode surfaces is of great interest if these molecular catalytic activities and selectivities are to be transferred to more practical heterogeneous electrosynthetic systems, which have already shown promising results for CO 2 reduction, water reduction and water oxidation in the context of storage of renewable energy. Over the past decades, many immobilization strategies have been developed, which can be categorized into covalent binding (achieved by adding anchoring groups such as carboxylate to the catalysts), non-covalent binding (pi-stacking on carbon-based electrodes) and polymerization-based binding. Here, we report a new strategy for surface immobilization of molecular electrocatalysts, which relies on a non-covalent "click" chemistry approach to bind molecular species in welldefined sites on electrode surfaces. The binding of electroactive molecular guests into molecular pockets by means of host-guest complex (HGC) formation has previously been studied by several groups, including those of Stoddart and Kaifer, Reinhoudt and Huskens. Liu et al. reported the HGC-formation on gold surfaces with the C 60 monoanion as guest, which was found to be electrochemically stable over prolonged durations. Light-induced electron transfer to and from dye molecules bound via the HGC approach was also demonstrated by Freitag and Galoppini. The group of Sun demonstrated the use of HGC to improve electron transfer between a molecular catalyst and a dye molecule bound onto TiO 2 . Among the diverse class of host molecules, cyclodextrins, cucurbiturils and calixarenes are the most studied for HGC formation on different surfaces. For cyclodextrins, the electron transfer rates between the electrode and guest molecules situated inside the surface-bound hosts have been reported to be on the order of 100 s -1 , indicating the potential applicability of these systems for molecular electrocatalysis. It was found that the binding of the guest was not affected by redox processes if the binding units do not undergo oxidation themselves.