Effects of redox mediators on the catalytic activity of iron porphyrins towards oxygen reduction in acidic media
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 conjunctio...
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2016
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| _version_ | 1779905283217162240 |
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| author | He, Qinggang Wu, Gang Liu, Ke Khene, Samson Li, Qing Mugadza, Tawanda Deunf, Elise Nyokong, Tebello Chen, Shaowei W. |
| author_facet | He, Qinggang Wu, Gang Liu, Ke Khene, Samson Li, Qing Mugadza, Tawanda Deunf, Elise Nyokong, Tebello Chen, Shaowei W. |
| author_sort | He, Qinggang |
| collection | DSpace |
| 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 | Article |
| id | ir-11408-1040 |
| institution | My University |
| language | English |
| publishDate | 2016 |
| publisher | Wiley |
| record_format | dspace |
| spelling | ir-11408-10402022-06-27T13:49:06Z Effects of redox mediators on the catalytic activity of iron porphyrins towards oxygen reduction in acidic media He, Qinggang Wu, Gang Liu, Ke Khene, Samson Li, Qing Mugadza, Tawanda Deunf, Elise Nyokong, Tebello Chen, Shaowei W. Redox Oxygen reduction 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. 2016-04-26T10:21:23Z 2016-04-26T10:21:23Z 2014 Article 2196-0216 onlinelibrary.wiley.com/journal/10.1002/(ISSN)2196-0216/homepage/ProductInformation.html en ChemElectroChem;Vol. 3 open Wiley |
| spellingShingle | Redox Oxygen reduction He, Qinggang Wu, Gang Liu, Ke Khene, Samson Li, Qing Mugadza, Tawanda Deunf, Elise Nyokong, Tebello Chen, Shaowei W. Effects of redox mediators on the catalytic activity of iron porphyrins towards oxygen reduction in acidic media |
| title | Effects of redox mediators on the catalytic activity of iron porphyrins towards oxygen reduction in acidic media |
| title_full | Effects of redox mediators on the catalytic activity of iron porphyrins towards oxygen reduction in acidic media |
| title_fullStr | Effects of redox mediators on the catalytic activity of iron porphyrins towards oxygen reduction in acidic media |
| title_full_unstemmed | Effects of redox mediators on the catalytic activity of iron porphyrins towards oxygen reduction in acidic media |
| title_short | Effects of redox mediators on the catalytic activity of iron porphyrins towards oxygen reduction in acidic media |
| title_sort | effects of redox mediators on the catalytic activity of iron porphyrins towards oxygen reduction in acidic media |
| topic | Redox Oxygen reduction |
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