Abstract
Photoelectrochemical (PEC) characterization of carbon nanotubes-titania (CNT-TiO2) electrodes sensitized with bismuth sulfide (Bi2S3) is presented as a function of CNT-TiO2 annealing temperature and Bi2S3 deposition time. Arrays of CNT were grown on stainless steel substrates by spray pyrolisis and then functionalized with a thin layer of TiO2. Air annealing at 400 and 550ºC modified the morphology and C/TiO2 ratio in the hybrid materials, from CNT-TiO2 coaxial cables to C-doped TiO2. Both matrices increase the amount of Bi2S3 deposited by chemical bath, but the absorbing layer is mainly located at the outer electrode surface. Best PEC performance is observed in electrodes based in C-doped TiO2, as electrodes based on coaxial cables of CNT-TiO2 show large capacitive currents that interfere with photocurrent generation.
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