With limited nitrate production in these experiments, product quantification by the colourimetric Griess test became impossible due to the concentration falling below the detection limit. Nevertheless, electrocatalysis could be repeated multiple times utilising the same PA [6]-modified electrode (Figure ). When the pH of the substrate solution was increased to 11.3 (0.2 M NH 3, without supporting electrolyte), electrocatalysis remained possible with FE of up to 57% for the conversion to nitrate. However, reabsorption was not achievable at this pH, as evidenced by the absence of redox peaks during CV measurements (Figure , red). This indicates that PA [6] was not stably bound at this pH.