To explore the light-induced modulation of the pH on the generated photocurrent, we turned to photoelectrochemical measurements where a platinum CE was inserted into the half-cell containing the 2N6S PA and a graphite WE and an Ag/AgCl RE were inserted to a joint halfcell containing the 6AQ PB (Figure ). We used this H-cell setup to follow the CA at the negative (-1V) bias regime on the WE (Figure ) while irradiating the different half cells in the following sequence: irradiation the 6AQ PB → dark → irradiation the 2N6S PA → dark.