Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.115
Publication date: 18th July 2019
The concept of dye-sensitized photoelectrosynthesis cells (DS-PECs) has recently been proposed as an alternative water splitting cell. The DS-PEC architecture involves an oxide semiconductor sensitized by an organic/inorganic chromophore and a water oxidation catalyst (WOC) connected either to the chromophore (a dyad assembly) or directly to the semiconductor. Recently, several dye-sensitized photoanodes, all of which consist of Ru chromophores, have been developed [1,2]. The rarity of ruthenium, however, forces the scientific community to introduce earth abundat chromophores. Being in the same group, iron bipyridyl complexes appear to be the obvious candidates for this purpose. Due to primogenic effect, the MLCT state in iron bipyridyl complexes is much less favored compared to that in ruthenium bipyridyl complexes [3]. Therefore, new iron complexes should be investigated to overcome this significant challenge.
We recently found that chromophore-Prussian blue assemblies can be constructed utilizing Fe(CN)5- group as a bridging as well as a relay group [4]. Herein, we take this idea to a new level by demonstrating an iron chromophore based photoanode. The preparation of the donor-acceptor iron chromophore and the dye-sensitized photoanode will be presented. Moreover, photoelectrochemical, transition absorption and quantum mechanical calculations will be presented to explain the charge transfer dynamics of the photoelectrode.
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