Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 9, Issue 35, Pages 19489-19507Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta02769g
Keywords
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Funding
- National Natural Science Foundation of China [51908256, 52002119]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [19KJA460004]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- State Key Laboratory Base of Eco-chemical Engineering [STHG1902]
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Fe-based atomic catalysts show great advantages in the ORR due to high atom-utilization efficiency and well-defined active sites. The high performance is mainly attributed to the coordination condition and electronic structures. Achieving high activity and stability with a high content of metal atoms remains a major challenge.
Single-atom and double-atom catalysts have emerged as a new Frontier in many fields due to their high atom-utilization efficiency, excellent catalytic properties and good durability. In this decade, Fe-based atomic catalysts have exhibited great advantages toward the oxygen reduction reaction (ORR) owing to the high utilization efficiency of their single/dual atomic sites, well-defined active sites and high selectivity toward the four-electron (4e(-)) pathway. To explore their catalytic behavior, many efforts have been made to synthesize Fe-based atomic catalysts. In addition, the high performance of Fe-based single/dual atoms toward ORR is mainly attributed to the critical coordination condition and the corresponding electronic structures. Currently, it is a great challenge to achieve high activity and good stability with a high content of metal atoms, while maintaining their atomic dispersion. In this review, we begin with a systematic review about the influence of the coordination environment of Fe-based single/dual-atom catalysts on their electrocatalytic properties, followed by an overview of some new strategies to improve their coordination environment. Then, we present a comprehensive summary on the advantages of their unique structures, catalytic activity for the ORR and further applications. Finally, the remaining key challenges and future opportunities in this emerging field are concluded to provide more useful clues for the development of advanced catalysts.
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