CdS|TiO2 non-enzymatic sulfide photoelectrochemical sensor

VAZQUEZ, CECILIA I.; MONTERO BRUNI, FELIPE; BARUZZI, ANA M.; IGLESIAS, RODRIGO A.

IEEE SENSORS JOURNAL

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Lugar: New York; Año: 2023 vol. 23 p. 856 - 863

1530-437X

A non-enzymatic photoelectrochemical detection of aqueous sulfide and ascorbic acid, using an CdS|TiO 2 -nanotubes photoanode is presented. Its performance is compared with an CdS|Pt photoanode. Both electrodes shown high sensitivity in the visible range with capabilities of detection at micromolar levels for sulfide and ascorbic acid. Photoelectrodes are also able to detect micromolar levels of H 2 O 2 , but this analyte causes the degradation of CdS during photocurrent measurements, with the consequent release of Cd 2+ ions to the analyte solution.