This article presents a novel approach to photochemical energy conversion by employing organic compounds. We demonstrated that water can be photoelectrochemically split into H2 and O2 using an organic photodevice responsive to the entire visible-light energy range of <750 nm. When an organic p/n bilayer of metal-free phthalocyanine (H 2Pc, a p-type semiconductor) and fullerene (C60, an n-type semiconductor) was applied to a photocathode in the water phase, H2 was evolved at Pt-coated C60 along with the conduction of the electron carriers photogenerated at the p/n interface, concurrently yielding O2 at the counter electrode. This is the first example of C 60 participation in H2 evolution: a mechanism was proposed, involving the formation of an active species (i.e., C 602-) on the basis of the results of in situ spectroelectrochemical measurements.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films