Fig. 2. (a) Supramolecular dye–catalyst assembly on photocathode: layer-by-layer deposition of RuP3, Zr4+ and NiP on p-type NiO photocathode (see text for details). (b) Energy diagram of the NiO photocathode assembly showing the proposed electron transfer mechanisms (reductive quenching) as black solid arrows and possible recombination pathways as grey dashed arrows between p-NiO, RuP3 and NiP.
