Beilstein J. Nanotechnol.2011,2, 127–134, doi:10.3762/bjnano.2.15
potential; nanoporous TiO2 thin film; photocurrent; Schottkyjunctionandohmiccontact; Introduction
Photoelectrocatalytic reactions at semiconductor electrodes were investigated before the 1960s [1][2]. A semiconductor electrode forms a type of Schottky junction with liquid electrolytes called a liquid
simultaneously both Schottkyjunctionandohmiccontact behavior. Sensitization and electron transfer in TiO2 nanoparticles and nanoporous electrodes by [Fe(CN)6]4− has been thoroughly investigated [8][9][10], but such multi-nature behavior of both Schottkyjunctionandohmiccontact has not been reported.
In
second band structure whose Efb lies near the redox potential of the iron complex on the TiO2 surface.
The photocurrents increased with repeated scans. In a previous paper [14] by one of the present authors (MK), both Schottkyjunctionandohmiccontact behavior were found at a single crystal CdS
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Figure 1:
Side view of a photoelectrochemical cell (1 cm × 1 cm × 3 cm) used for CV measurements with membran...