| Autor: |
da Silva, Fernanda Gabrielle Soares, Ferreira, Andréia Rodrigues, dos Santos, Clenilton Costa, de Menezes, Alan Silva, de Cássia Silva Luz, Rita, Damos, Flávio Santos |
| Předmět: |
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| Zdroj: |
Journal of Solid State Electrochemistry; Sep2021, Vol. 25 Issue 8/9, p2213-2224, 12p |
| Abstrakt: |
Photoelectrochemical systems based on half-photoelectrochemical cells have been widely exploited in the development of analytical methods. However, the development of self-powered systems based on dual-photoelectrode photoelectrochemical cells for the determination of many species is still a challenger. In this work, a two-compartment photoelectrochemical cell has been developed to determine tannic acid exploiting the effects of the analyte on the photoelectrochemical response of a CdS/TiO2/FTO photoanode. The photoactivity of the photoanode was characterised by electrochemical impedance spectroscopy (EIS) and measurements of the photocurrent. The spectroscopic characteristics of the photoanode were evaluated by Raman and Fourier-transform infrared spectroscopy (FT-IR) measurements, the structural characteristics were evaluated by powder X-ray diffraction (PXRD) measurements, the morphology of the surface was evaluated by scanning electron microscopy, and the composition analysis was evaluated by energy-dispersive X-ray spectroscopy. Electrochemical impedance measurements were performed under the incidence and absence of light to investigate the effects of photons on the charge transfer resistance of the photoanode. The nature of the semiconductor and the flat band potential of the photoanode were evaluated by Mott-Schottky analysis. The influence of the TA on the photoelectrochemical response of the CdS/TiO2/FTO electrode was evaluated by measuring the photocurrent of the system. The PEC platform presented a linear response range for TA from 10 to 500 μmol L−1. The PEC was successfully applied to the determination of the TA in orange juice samples with a mean recovery percentage of about 99%. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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