Abstract
Hydrothermally synthesized titanate nanotubes are calcined at different temperatures (400−700 °C) in air to obtain TiO2(B) nanotubes, anatase nanorods, and anatase nanoparticles. The morphology and structure of the prepared samples are characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). These samples with different morphologies and structures are used to fabricate photoelectrodes for dye-sensitized solar cells (DSSCs). It is found from current−voltage curve (I−V) measurements that the DSSC with anatase nanorods calcined at 600 °C shows much better photoelectrochemical performance than those using other samples, with a photovoltaic conversion efficiency of 7.71%. Electrochemical impendence spectroscopy (EIS), intensity-modulated photocurrent spectroscopy (IMPS), and intensity-modulated voltage spectroscopy (IMVS) are used to further investigate the kinetics process of TiO2 film electrodes. The results indicate that the charge-transfer resistance and lifetime depend on the m...
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