- Title
- Molecular catalysis of the oxygen reduction reaction by iron porphyrin catalysts tethered into Nafion layers
- Creator
- He, Qinggang
- Creator
- Mugadza, Tawanda
- Creator
- Kang, Xiongwu
- Creator
- Zhu, Xiaobing
- Creator
- Chen, Shaowei
- Creator
- Kerr, John
- Creator
- Nyokong, Tebello
- Subject
- To be catalogued
- Date Issued
- 2012
- Date
- 2012
- Type
- text
- Type
- article
- Identifier
- http://hdl.handle.net/10962/243168
- Identifier
- vital:51123
- Identifier
- xlink:href="https://doi.org/10.1016/j.jpowsour.2012.05.043"
- Description
- This study was motivated by the need for improved understanding of the kinetics and transport phenomena in a homogeneous catalyst system for the oxygen reduction reaction (ORR). Direct interaction between the sulfonic groups of Nafion and an Fe(III) meso-tetra(N-methyl-4-pyridyl) porphine chloride (Fe(III)TMPyP) compound was observed using FTIR and in situ UV–Vis spectroelectrochemical characterizations. A positive shift of the half wave potential value (E1/2) for ORR on the iron porphyrin catalyst (Fe(III)TMPyP) was observed upon addition of a specific quantity of Nafion ionomer on a glassy carbon working electrode, indicating not only a faster charge transfer rate but also the role of protonation in the oxygen reduction reaction (ORR) process. A membrane electrode assembly (MEA) was made as a sandwich of a Pt-coated anode, a Nafion® 212 membrane, and a Fe(III)TMPyP + Nafion ionomer-coated cathode. This three-dimensional catalysis system has been demonstrated to be working in a H2/O2 proton exchange membrane (PEM) fuel cell test.
- Format
- computer
- Format
- online resource
- Format
- application/pdf
- Format
- 1 online resource (9 pages)
- Format
- Publisher
- Elsevier
- Language
- English
- Relation
- Journal of Power Sources
- Relation
- He, Q., Mugadza, T., Kang, X., Zhu, X., Chen, S., Kerr, J. and Nyokong, T., 2012. Molecular catalysis of the oxygen reduction reaction by iron porphyrin catalysts tethered into Nafion layers: An electrochemical study in solution and a membrane-electrode-assembly study in fuel cells. Journal of Power Sources, 216, pp.67-75
- Relation
- Journal of Power Sources volume 216 p. 67 2012 1873-2755
- Rights
- Publisher
- Rights
- Use of this resource is governed by the terms and conditions of the Elsevier Terms and Conditions Statement (https://www.elsevier.com/legal/elsevier-website-terms-and-conditions)
- Rights
- Closed Access
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Nyokong, Tebello (Distinguished Professor)
RU DST/NRF SARChI for Medicinal Chemistry and Nanotechnology
RU Department of Chemistry
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