In this example, a surface loading of 0.026 mC with a surface area of 1.25 cm 2 and a scan speed of 100mV, corresponds to a catalyst loading of 1.15 pmol cm -2 : Physisorbed guest means that no previous host functionalization of the electrode was performed to demonstrate that the host is necessary to bind the guest to the surface. A blank sample FTO + mITO was tested twice with the same tests after CA for 90 min at 0.98V vs NHE in 200 mM NH3 in phosphate buffer (pH=10.86) to demonstrate the activity of our catalysts. The tested sample did not contain nitrate or nitrite, which shows that the plain electrode is not capable of oxidizing ammonia.