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Co-Fe Prussian Blue Coordination Polymer Modified Silicon Nanowires Array for Efficient Photoelectrochemical Water Oxidation.

The Co-Fe prussian blue coordination polymer modified Silicon nanowires array (SiNW@CoHCF array) exhibits promising behavior in photoelectrochemical (PEC) water oxidation, giving rise to a largely enhanced photocurrent density and stability, much superior to those of SiNW-based photoanodes. The CoHCF shell as effective co-catalyst increases the reaction kinetics, thus depressing the charge recombination rate, as well as protects SiNWs array photoanode from photocorrosion. It is found that the CoHCF significantly decreases the charge transfer impedance (Rct), which means that the CoHCF facilitates majority transport and collection. These advantages may account for the performance enhancement.