- Title
- Effects of redox mediators on the catalytic activity of iron porphyrins towards oxygen reduction in acidic media
- Creator
- He, Qinggang, Wu, Gang, Liu, Ke, Khene, Samson M, Li, Qing, Mugadza, Tawanda, Deunf, Elise, Nyokong, Tebello, Chen, Shaowei W
- Subject
- To be catalogued
- Date
- 2014
- Type
- text
- Type
- article
- Identifier
- http://hdl.handle.net/10962/241472
- Identifier
- vital:50942
- Identifier
- xlink:href="https://doi.org/10.1002/celc.201402054"
- Description
- The effects of different redox mediators on the oxygen reduction reaction (ORR) catalyzed by an iron porphyrin complex, iron(III) meso-tetra(N-methyl-4-pyridyl)porphine chloride [FeIIITMPyP], in 0.1 M triflic acid were investigated by cyclic voltammetry (CV) and spectroelectrochemistry in conjunction with density functional theory (DFT) calculations. The formal potentials of the FeIIITMPyP catalyst and the redox mediators, as well as the half-wave potentials for the ORR, were determined by CV in the absence and presence of oxygen in acidic solutions. UV/Vis spectroscopic and spectroelectrochemical studies confirmed that only the 2,2′-azino-bis(3-ethylbenzothiazioline-6-sulfonic acid)diammonium salt (C18H24N6O6S4) showed effective interactions with FeIIITMPyP during the ORR. DFT calculations suggested strong interaction between FeIIITMPyP and the C18H24N6O6S4 redox mediator. The redox mediator caused lengthening of the dioxygen iron bond, which thus suggested easier dioxygen reduction. Consistent results were observed in electrochemical impedance spectroscopic measurements for which the electron-transfer kinetics were also evaluated.
- Format
- computer, online resource, application/pdf, 1 online resource (8 pages), pdf
- Publisher
- Wiley Library Online
- Language
- English
- Relation
- ChemElectroChem, He, Q., Wu, G., Liu, K., Khene, S., Li, Q., Mugadza, T., Deunf, E., Nyokong, T. and Chen, S.W., 2014. Effects of redox mediators on the catalytic activity of iron porphyrins towards oxygen reduction in acidic media. ChemElectroChem, 1(9), pp.1508-1515, ChemElectroChem volume 1 number 9 p. 1508 2014 2196-0216
- Rights
- Publisher
- Rights
- Use of this resource is governed by the terms and conditions of the Wiley Library Online Terms of Use Statement (https://onlinelibrary.wiley.com/terms-and-conditions)
- Rights
- Closed Access
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Khene, Samson Mielie (Assoc Prof)
RU DST/NRF SARChI for Medicinal Chemistry and Nanotechnology
Nyokong, Tebello (Distinguished Professor)
RU Department of Chemistry
SDG 03. Good Health and Well-Being
| Thumbnail | File | Description | Size | Format | |||
|---|---|---|---|---|---|---|---|
| View Details | SOURCE1 | Effects of redox mediators.pdf | 668 KB | Adobe Acrobat PDF | View Details |