Immobilizing single atom catalytic sites onto highly reduced carbon hosts: Fe-N-4/CNT as a durable oxygen reduction catalyst for Na-air batteries
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- Immobilizing single atom catalytic sites onto highly reduced carbon hosts: Fe-N-4/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; Lee, Geunsik; Jang, Ji-Wook; Joo, Sang Hoon; Lee, Jae Sung
- Issue Date
- ROYAL SOC CHEMISTRY
- JOURNAL OF MATERIALS CHEMISTRY A, v.8, no.36, pp.18891 - 18902
- 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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