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Transformation of the Active Moiety in Phosphorus-Doped Fe–N–C for Highly Efficient Oxygen Reduction Reaction by Roh, Jeonghan (author);Cho, Ara (author);Kim, Sungjun (author);Lee, Kug-Seung (author);Shin, Jaewook (author);Choi, Jin Seok (author);Bak, Junu (author);Lee, SangJae (author);Song, DongHoon (author);Kim, Eom-Ji (author);Lee, Chaewon (author);Uhm, Young Rang (author);Cho, Yong-Hun (author);Han, Jeong Woo (author);Cho, EunAe (author) is a Chemistry article available to read on EtoBox.
What is Transformation of the Active Moiety in Phosphorus-Doped Fe–N–C for Highly Efficient Oxygen Reduction Reaction about?
Iron-and nitrogen-doped carbon (Fe-N-C) materials have been suggested as the most promising replacement for Pt-based catalysts in the oxygen reduction reaction (ORR) owing to the FeN 4 active moiety. Based on the relationship between the oxygen binding energy and the catalytic activity, Fe-N-C has a very strong oxygen binding energy; hence, hard to desorb the final reaction intermediate of \*OH. Herein, we provide an effective method of tuning the active moiety using a phosphine-gas treatment for Fe-N-C. Combined analyses of experimental and computational results reveal that the conventional FeN 4 moiety is transformed into FeN 3 PO through the P-doping post-treatment. Furthermore, we propose an ORR mechanism on the unique FeN 3 PO moiety based on a microkinetic model, in which \*OH intermediates are considered. Compared to the FeN 4 moiety, the FeN 3 PO moiety facilitates \*OH desorption, thereby enhancing the ORR activity in both alkaline and acidic electrolytes. The effects of P-doping on the ORR performance are also validated in both anion exchange membrane fuel cells (AEMFCs) and proton exchange membrane fuel cells (PEMFCs).
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- Author
- Roh, Jeonghan (author);Cho, Ara (author);Kim, Sungjun (author);Lee, Kug-Seung (author);Shin, Jaewook (author);Choi, Jin Seok (author);Bak, Junu (author);Lee, SangJae (author);Song, DongHoon (author);Kim, Eom-Ji (author);Lee, Chaewon (author);Uhm, Young Rang (author);Cho, Yong-Hun (author);Han, Jeong Woo (author);Cho, EunAe (author)
- Publisher
- American Chemical Society (ACS)
- Published
- 2023
- Language
- EN
- Field
- Chemistry (Physical Sciences)