Evaluation of local oxygen flux produced by photoelectrochemical hydroxide oxidation by scanning electrochemical microscopy

Several in-situ electrochemical approaches have been developed for performing a localized photoelectrochemical investigation of the photoanode. One of the techniques is scanning electrochemical microscopy (SECM), which probes local heterogeneous reaction kinetics and fluxes of generated species. In...

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Bibliographic Details
Published in:Scientific reports 2023-03, Vol.13 (1), p.5019-5019, Article 5019
Main Authors: Gupta, Bhavana, Aziz, Ariba, Sundriyal, Shashank, Shrivastav, Vishal, Melvin, Ambrose A., Holdynski, Marcin, Nogala, Wojciech
Format: Article
Language:English
Subjects:
639/301
639/4077
639/638
Electrochemistry
Ferric oxide
Fluctuations
Humanities and Social Sciences
Image processing
Microscopy
multidisciplinary
Oxygen
Scanning
Science
Science (multidisciplinary)
Tin oxide
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Summary:Several in-situ electrochemical approaches have been developed for performing a localized photoelectrochemical investigation of the photoanode. One of the techniques is scanning electrochemical microscopy (SECM), which probes local heterogeneous reaction kinetics and fluxes of generated species. In traditional SECM analysis of photocatalysts, evaluation of the influence of radiation on the rate of studied reaction requires an additional dark background experiment. Here, using SECM and an inverted optical microscope, we demonstrate the determination of O 2 flux caused by light-driven photoelectrocatalytic water splitting. Photocatalytic signal and dark background are recorded in a single SECM image. We used an indium tin oxide electrode modified with hematite (α-Fe 2 O 3 ) by electrodeposition as a model sample. The light-driven flux of oxygen is calculated by analysis of SECM image recorded in substrate generation/tip collection mode. In photoelectrochemistry, the qualitative and quantitative knowledge of oxygen evolution will open new doors for understanding the local effects of dopants and hole scavengers in a straightforward and conventional manner.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-023-32210-6