- Title
- Promotion of Catalytic Oxygen Reduction Reactions
- Creator
- Wei, Yuqin
- Creator
- Zhao, Long
- Creator
- Yuan, Rui
- Creator
- Xue, Zhaoli
- Creator
- Mack, John
- Creator
- Chivumba, Choonzo
- Creator
- Nyokong, Tebello
- Creator
- Zhang, Jianming
- Subject
- To be catalogued
- Date Issued
- 2022
- Date
- 2022
- Type
- text
- Type
- article
- Identifier
- http://hdl.handle.net/10962/300347
- Identifier
- vital:57919
- Identifier
- xlink:href="https://doi.org/10.1021/acs.inorgchem.2c01591"
- Description
- Three ABAB-type cobalt meso-tetraarylporphyrins with fluorine (F-CoPor), acetic acid (AC-CoPor), and cyanoacetic acid (CN-CoPor) groups at the para-positions of phenyl rings at the 10,20-positions are synthesized and evaluated as catalysts for oxygen reduction reactions (ORRs). In density functional theory calculations, the frontier molecular orbitals of these complexes were found to be stabilized relative to model complexes with electron-withdrawing atoms or moieties on the meso-aryl rings. Electrochemical measurements suggest that electrodes with CN-CoPor (CN-CoPor/C) exhibit the most positive ORR potential values and the highest limiting current density in both acidic and alkali electrolytes, while the F-CoPor/C electrocatalyst exhibits extremely low ORR performance. The electron transfer numbers for the electrocatalysts are more than 3.0, indicating that a mixture of 2- and 4-electron transfer pathways occurs. The results demonstrate that coupling the hydrogen bonding properties and electron-withdrawing abilities through rational design of the substituent at the meso-position is an efficient way to modify the ORR performance.
- Format
- computer
- Format
- online resource
- Format
- application/pdf
- Format
- 1 online resource (11 pages)
- Format
- Publisher
- ACS Publications
- Language
- English
- Relation
- Inorganic Chemistry
- Relation
- Wei, Y., Zhao, L., Yuan, R., Xue, Z., Mack, J., Chiyumba, C., Nyokong, T. and Zhang, J., 2022. Promotion of Catalytic Oxygen Reduction Reactions: The Utility of Proton Management Substituents on Cobalt Porphyrins. Inorganic Chemistry, 61(33), pp.13085-13095
- Relation
- Inorganic Chemistry volume 61 number 33 p. 13085 2022 1520-510X
- Rights
- Publisher
- Rights
- Use of this resource is governed by the terms and conditions of the ACS Publications Terms of Use Statement (https://0-www.acs.org.wam.seals.ac.za/content/acs/en/terms.html)
- Rights
- Closed Access
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Collections
Mack, John (Associate Prof)
Nyokong, Tebello (Distinguished Professor)
RU DST/NRF SARChI for Medicinal Chemistry and Nanotechnology
RU Department of Chemistry
| Thumbnail | File | Description | Size | Format | |||
|---|---|---|---|---|---|---|---|
| View Details Download | SOURCE1 | Promotion of Catalytic Oxygen Reduction Reactions.pdf | 1 MB | Adobe Acrobat PDF | View Details Download |