Abstract
In the present work, the photoelectrochemical characterization of ITO/TiO2 electrodes electrosynthesized at two distinct TiO2 film charges (0.35 and 1.00 C) was performed. Scanning electron microscopy presented a globular-like nanostructure and a typical morphology that are dependent on the growing charge, where the photoelectrode synthesized at 0.35 C presented a more homogeneous morphology. Such dependence was also observed at the photoelectrochemical response, once the photoactivity for the photoelectrode synthesized at 0.35 C was better than the photoelectrode synthesized at 1.00 C, which was explained by the surface recombination process and the electron lifetime. In order to explore the charge-transfer process and the displacement of the quasi-Fermi level upon illumination, electrochemical impedance spectroscopy (EIS) was performed at distinct applied potentials. EIS results corroborate the previous results, presenting a higher charge-transfer resistance and a lower chemical capacitance for the 1.00 C electrode film, the last one in accordance with the open-circuit voltage decay.
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Acknowledgments
The authors should thank the financial support from Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) under Universal Project (446320/2014-5) and Scholarship (158984/2014-5), the National Institute for Science and Technology on Organic Electronics (INEO), Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), and Fundação Araucária do Estado do Paraná.
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Marchesi, L.F., Freitas, R.G., Spada, E.R. et al. Photoelectrochemical characterization of ITO/TiO2 electrodes obtained by cathodic electrodeposition from aqueous solution. J Solid State Electrochem 19, 2205–2211 (2015). https://doi.org/10.1007/s10008-015-2848-1
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DOI: https://doi.org/10.1007/s10008-015-2848-1