Accordingly, upon irradiation, the formed RNH + can now be attracted to the electrode and accept electrons from the WE. Hence, both water and RNH + reduction processes are possible and the addition of RNH + reduction under irradiation is causing the observed changes in both CV and CA measurements. To pinpoint the contribution of RNH + to the measured photocurrent, we have performed CA upon titrating RNH + at a low pH solution (Figure and text within).