Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 36, Pages 18891-18902Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta06489k
Keywords
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Funding
- Climate Change Response Project [NRF-2015M1A2A2074663, NRF-2019M1A2A2065612]
- Basic Science Grant through the National Research Foundation (NRF) of Korea - Ministry of Science and ICT [NRF-2019R1A4A1029237]
- KIAT - Ministry of Trade, Industry, and Energy [N0001754]
- UNIST [1.190013.01]
- National Research Foundation of Korea [2019R1A4A1029237] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Immobilizing metal ions on a carbon support usually involves severe aggregation (sintering) and loose attachment of metal ions owing to a weak metal-support interaction. Here, we propose an alternative synthetic strategy termed 'selective microwave annealing' (SMA) to stabilize abundant single atom catalytic sites onto a highly reduced form of carbon host with only a few minutes of microwave irradiation. Thus, nitrogen-coordinated single atom iron sites on a carbon nanotube (Fe-N-4/CNT) synthesizedviaSMA show unprecedented oxygen reduction reaction (ORR) activity and pH-universal durability superior to those of thermally annealed Fe-N-4/CNT and expensive Pt/C catalysts. Furthermore, an aqueous Na-air battery with our Fe-N-4/CNT catalyst operates as effectively as the device with the Pt/C catalyst. The method provides a new concept for the design of various strongly coupled and highly dispersed carbon-supported catalysts, which could open up new avenues for use in a wide range of electrochemical and catalytic applications.
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