Publication date: 31st March 2013
Efficient photoelectrochemical (PEC) water splitting by solution prepared semiconductor photo-anodes on FTO glass is demonstrated. Two types of 3-dimensional photo-electrodes containing semiconductor oxides ZnO or WO3 were characterized in photoelectrochemical water splitting. Particularly, for the 3D photo-anode layer, a self-organized ripple nanostructure was formed enhancing light absorption and increasing the interfacial area with the electrolyte. Furthermore, to induce more effective extraction of electrons, an organic carbon based thin film, i.e. a phenyl-C61-butyric acid methyl esterlayer, was inserted between the prepared photo-anode oxide, and conducting FTO electrode.
Insertion of the layer of the C60 derivative providesa very substantial increase in photocurrent dynamics in an operating PEC cell. Abetter current homogeneity was determined by current AFM. From this result, we conclude that accumulation and trapping of photo-generated chargeat the interfacebetween photo-anode and conducting FTO electrode are less significant.
Because of these enhanced interfacial characteristics, the PEC cell with additional organic carbon layer exhibits a higher photo-current as compared to the system without the additional organic carbon layer.
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