Fertilizer production dominates the industrial use of nitric acid with almost 81%, however, its synthesis via the Ostwald process is highly energy demanding. Molecular electrocatalysts show high activity in comparison to heterogeneous catalysts but suffer from reduced stability. The high pH of aqueous ammonia solutions presents an additional challenge for the stability of these catalysts. While thus far, the reported homogeneous catalysts exhibit large overpotentials, tuning of the metal ion and ligand sphere provides a powerful method for improving the performance. Heterogenization by immobilization of a molecular catalyst onto an electrode via a host-guest (HG) complex can be beneficial as this combines the high activity of molecular catalysts with the high stability of heterogeneous catalysts. Moreover, diffusion limitations of homogeneous catalysts in electrolytic systems may be overcome since all catalyst molecules are bound to the electrode surface, dramatically reducing the amount of catalyst present in the system compared to homogeneous systems. Beiler et al. recently reported a heterogenized approach anchoring a Ru-bda oligomer as the catalyst to the electrode via π-interactions, which showed high turnover numbers and faradaic efficiencies. A clear benefit of the anchored catalyst is that electrocatalysis can be conducted in an aqueous medium. However, the system displayed limited stability at higher pH (>10). Increasing the stability of the system while maintaining high efficiency could be achieved by employing a supramolecular HG assembly bound to the electrode surface. The HG complex enables the flow of charge between the surface and the catalytically active metal center. As reported previously, the HG electrochemical approach benefits from a non-direct bond from the surface to the catalysts, which allows for electrode recyclability and the independent improvement of the host anchoring unit, the guest binding group, and its desired active metal center. Tailoring the HG systems can lead to increased stability of molecular catalysts. In our previous work, we modified the backbone of the known [Ru(tpy)(bpy-NMe2)] 2+ (where bpy-NMe2 is 4,4'-bis(dimethylamino)-2,2'-bipyridyl and tpy is terpyridine) catalyst with an aromatic unit (naphthyl) to enable the flow of electrons between the catalytic active species and the electrode surface (guest 2). In the present study, we show that the catalyst backbone (guest 1) does not necessarily need to exhibit electron-transporting functionalities as long as the distance from the active site of the catalyst to the surface is sufficiently short to enable electron transfer via tunneling. We sought to improve our catalytic system by introducing a binding group to the guest molecules that typically exhibit stronger HG complex formation with beta-cyclodextrins (β-CD). Adamantane derivatives were reported to be among the strongest guests to bind to β-CD in (aqueous) solution, which motivated the incorporation of an adamantyl-substituent on the terpyridine backbone of the guest (Figure ). With this, we aimed to transfer the excellent binding properties from the solution to the surface-bound host molecule to achieve strong yet reversible binding of the catalyst guests on an electrode for efficient ammonia oxidation.