The effect of the AOx-based scavenger on O2 removal within this capillary channel of the sensor strip was evaluated by cyclic voltammetry. In the absence of the O2-scavenger, the O2 reduction signal appears at potential lower than -0.45 V vs the pseudo RE (Figure ). In contrast, when the AOx-based O2-scavenger was added, the signal of O2 reduction is fully suppressed in the CV which is identical to the CV performed inside a glovebox. No waiting time was used between the sample addition and the start of the CV. This demonstrates that the anaerobic conditions are achieved quickly within the time scale of the experiment (about 100 s until the potential reaches the O2 reduction potential), which is in excellent agreement with the prediction from the simulations.