Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.196
Publication date: 6th July 2018
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) either connected to the chromophore (a dyad assembly) or directly to the semiconductor. In this assembly, chromophore produces an electron-hole pair upon excitation with visible light followed by the injection of electrons to the semiconductor and then to the cathode compartment while holes are transferred to the catalytic site to activate the catalyst for water oxidation.
Despite the recent promising studies, achieving high stability for both the catalyst and the chromophore under DS-PEC operating conditions, extending the light absorption to visible and near IR region, and developing entirely earth abundant assemblies still remain as key challenges.
Our recent research efforts have recently been devoted to developing dye-sensitized photoanodes involving cyanide-based assemblies. For this purpose, pentacyanoferrate building block was used not only as donor system for the construction of a new donor-acceptor chromophore but also as a cyanide precursor to produce a heterogeneous cobalt-iron Prussian blue electrocatalyst film. The photoelectrochemical performance and superior stability of the Prussian blue film coupled with TiO2 will be presented in detail.
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