Heterogeneous Electrochemical Ammonia Oxidation with a Ru-bda Oligomer Anchored on Graphitic Electrodes via CH-π Interactions.

Molecular catalysts can promote ammonia oxidation, providing mechanistic insights into the electrochemical N cycle for a carbon-free fuel economy. We report the ammonia oxidation activity of carbon anodes functionalized with the oligomer {[Ru(bda-κ- )(4,4'-bpy)](4,4'-bpy)}, , where bda is [2,2'-bipyridine]-6,6'-dicarboxylate and 4,4'-bpy is 4,4'-bipyridine. Electrocatalytic studies in propylene carbonate demonstrate that the Ru-based hybrid anode used in a 3-electrode configuration transforms NH to N and H in a 1:3 ratio with near-unity faradaic efficiency at an applied potential of 0.

Synthesis, Structure, and Ammonia Oxidation Catalytic Activity of Ru-NH Complexes Containing Multidentate Polypyridyl Ligands.

Ammonia (electro)oxidation with molecular catalysts is a rapidly developing topic with wide practical applications ahead. We report here the catalytic ammonia oxidation reaction (AOR) activity using [Ru(tda-κ-NO)(py)], , (tda is 2,2':6',2''-terpyridine-6,6''-dicarboxylate; py is pyridine) as a catalyst precursor. Furthermore, we also describe the rich chemistry associated with the reaction of Ru-tda and Ru-tPa (tPa is 2,2':6',2''-terpyridine-6,6''-diphosphonate) complexes with NH and NH using [Ru(tda-κ-NO)(dmso)Cl] (dmso is dimethyl sulfoxide) and [Ru(tPa-κ-NO)(py)], , as synthetic intermediates, respectively.