Selective two-electron and four-electron oxygen reduction reactions using Co-based electrocatalysts
The oxygen reduction reaction (ORR) can take place via both four-electron (4e − ) and two-electron (2e − ) pathways. The 4e − ORR, which produces water (H 2 O) as the only product, is the key reaction at the cathode of fuel cells and metal-air batteries. On the other hand, the 2e − ORR can be used t...
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| Published in | Chemical Society reviews Vol. 54; no. 11; pp. 5248 - 5291 |
|---|---|
| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
England
Royal Society of Chemistry
03.06.2025
|
| Subjects | |
| Online Access | Get full text |
| ISSN | 0306-0012 1460-4744 1460-4744 |
| DOI | 10.1039/d4cs01199f |
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| Summary: | The oxygen reduction reaction (ORR) can take place
via
both four-electron (4e
−
) and two-electron (2e
−
) pathways. The 4e
−
ORR, which produces water (H
2
O) as the only product, is the key reaction at the cathode of fuel cells and metal-air batteries. On the other hand, the 2e
−
ORR can be used to electrocatalytically synthesize hydrogen peroxide (H
2
O
2
). For the practical applications of the ORR, it is very important to precisely control the selectivity. Understanding structural effects on the ORR provides the basis to control the selectivity. Co-based electrocatalysts have been extensively studied for the ORR due to their high activity, low cost, and relative ease of synthesis. More importantly, by appropriately designing their structures, Co-based electrocatalysts can become highly selective for either the 2e
−
or the 4e
−
ORR. Therefore, Co-based electrocatalysts are ideal models for studying fundamental structure-selectivity relationships of the ORR. This review starts by introducing the reaction mechanism and selectivity evaluation of the ORR. Next, Co-based electrocatalysts, especially Co porphyrins, used for the ORR with both 2e
−
and 4e
−
selectivity are summarized and discussed, which leads to the conclusion of several key structural factors for ORR selectivity regulation. On the basis of this understanding, future works on the use of Co-based electrocatalysts for the ORR are suggested. This review is valuable for the rational design of molecular catalysts and material catalysts with high selectivity for 4e
−
and 2e
−
ORRs. The structural regulation of Co-based electrocatalysts also provides insights into the design and development of ORR electrocatalysts based on other metal elements.
Recent progress made in Co-based electrocatalysts for selective four-electron (4e
−
) and two-electron (2e
−
) electrocatalytic oxygen reduction reactions is reviewed. |
|---|---|
| Bibliography: | Haoquan Zheng is currently a professor at the School of Chemistry and Chemical Engineering at Shaanxi Normal University. He received his BS degree (2006) and PhD degree (2011) in applied chemistry from Shanghai Jiao Tong University under the supervision of Professor Shunai Che. He worked as a postdoctoral fellow in the group of Professor Xiaodong Zou at Stockholm University. He moved to his current position in July 2016. His research interests mainly focus on the development of hierarchical porous materials with novel structures and functions. 2 Wei Zhang is currently a professor at the School of Chemistry and Chemical Engineering at Shaanxi Normal University. He received his BS degree (2007) in chemistry from Peking University in Beijing, China and PhD degree (2012) from Nanyang Technological University in Singapore with Professor Rong Xu. After postdoctoral work on photocatalytic CO Zuozhong Liang is currently an associate research fellow at the School of Chemistry and Chemical Engineering at Shaanxi Normal University. He received his BS degree (2011) from Qufu Normal University and PhD degree (2016) from the Beijing University of Chemical Technology under the supervision of Professor Jian-Feng Chen. In July 2016, he joined the research group of Professor Rui Cao. His research interests are in the development of bioinspired electrocatalysts used in energy-related small molecule activation. reduction and organic synthesis. Haitao Lei is currently an associate research fellow at the School of Chemistry and Chemical Engineering at Shaanxi Normal University. He received his BS degree (2012) from Lanzhou University and PhD degree (2017, with professor Rui Cao) from the Renmin University of China. He served as a postdoctoral fellow at Shaanxi Normal University (2017-2020), working under the supervision of professor Rui Cao. His research interests focus on the design and development of novel functional metal complexes and related materials for the activation of energy-related small molecules. Rui Cao is currently a professor at the School of Chemistry and Chemical Engineering at Shaanxi Normal University. He received his BS degree (2003) in chemistry from Peking University in Beijing, China and his PhD degree (2008) from Emory University in Atlanta, Georgia. He was the Dreyfus Postdoctoral Fellow (2009-2011) at the Massachusetts Institute of Technology under the guidance of Professor Stephen J. Lippard. In 2011, he became a professor at the Renmin University of China and he transferred to Shaanxi Normal University in 2014. His current research focuses on molecular electrocatalysis. Hong-Yan Wang is currently a professor at the School of Chemistry and Chemical Engineering at Shaanxi Normal University. She received her PhD degree in organic chemistry from the Chinese Academy of Sciences in 2011. In 2014, she joined Shaanxi Normal University as an associate professor. Her research interests concern artificial photosynthesis based on supramolecular systems, coordination compounds with organic ligands and semiconductors. Now, she is working on the design of photochemical devices for water splitting, CO reduction with Professor Rong Xu, he joined the faculty at Shaanxi Normal University in 2014. His research focuses on the kinetics of electrocatalytic water oxidation. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 ObjectType-Review-3 content type line 23 |
| ISSN: | 0306-0012 1460-4744 1460-4744 |
| DOI: | 10.1039/d4cs01199f |