Immobilizing single atom catalytic sites onto highly reduced carbon hosts: Fe–N4/CNT as a durable oxygen reduction catalyst for Na–air batteries

Noh, Woo Yeong, Kim, Eun Mi, Kim, Kwang Young, Kim, Jin Hyun, Jeong, Hu Young, Sharma, Pankaj ORCID: https://orcid.org/0000-0003-2319-260X, Lee, Geunsik, Jang, Ji-Wook, Joo, Sang Hoon and Lee, Jae Sung 2020. Immobilizing single atom catalytic sites onto highly reduced carbon hosts: Fe–N4/CNT as a durable oxygen reduction catalyst for Na–air batteries. Journal of Materials Chemistry A: materials for energy and sustainability 8 (36) , pp. 18891-18902. 10.1039/D0TA06489K

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Abstract

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–N4/CNT) synthesized via SMA show unprecedented oxygen reduction reaction (ORR) activity and pH-universal durability superior to those of thermally annealed Fe–N4/CNT and expensive Pt/C catalysts. Furthermore, an aqueous Na–air battery with our Fe–N4/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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Publisher:	Royal Society of Chemistry
ISSN:	2050-7488
Date of Acceptance:	17 August 2020
Last Modified:	14 Nov 2022 14:30
URI:	https://orca.cardiff.ac.uk/id/eprint/153558

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