To test the Cu3Al2OF10 catalytic properties, a catalyst ink with 10 mg/mL was first prepared from Cu3Al2OF10 powder via extensive sonication in a 2:1 (V:V) solution with approx. 0.5% Nafion and 0.1% carbon nanotubes. This ink was drop cast on Toray carbon paper for a final catalyst loading of 1 mg/cm 2 and allowed to dry under ambient conditions prior to generate a working electrode applied for the NO3R.