The Marriage of the FeN4 Moiety and MXene Boosts Oxygen Reduction Catalysis: Fe 3d Electron Delocalization Matters
Iron–nitrogen–carbon (Fe–N–C) is hitherto considered as one of the most satisfactory alternatives to platinum for the oxygen reduction reaction (ORR). Major efforts currently are devoted to the identification and maximization of carbon‐enclosed FeN4 moieties, which act as catalytically active center...
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Published in | Advanced materials (Weinheim) Vol. 30; no. 43; pp. e1803220 - n/a |
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Abstract | Iron–nitrogen–carbon (Fe–N–C) is hitherto considered as one of the most satisfactory alternatives to platinum for the oxygen reduction reaction (ORR). Major efforts currently are devoted to the identification and maximization of carbon‐enclosed FeN4 moieties, which act as catalytically active centers. However, fine‐tuning of their intrinsic ORR activity remains a huge challenge. Herein, a twofold activity improvement of pristine Fe–N–C through introducing Ti3C2Tx MXene as a support is realized. A series of spectroscopy and magnetic measurements reveal that the marriage of FeN4 moiety and MXene can induce remarkable Fe 3d electron delocalization and spin‐state transition of Fe(II) ions. The lower local electron density and higher spin state of the Fe(II) centers greatly favor the Fe dz2 electron transfer, and lead to an easier oxygen adsorption and reduction on active FeN4 sites, and thus an enhanced ORR activity. The optimized catalyst shows a two‐ and fivefold higher specific ORR activity than those of pristine catalyst and Pt/C, respectively, even exceeding most Fe–N–C catalysts ever reported. This work opens up a new pathway in the rational design of Fe–N–C catalysts, and reflects the critical influence of Fe 3d electron states in FeN4 moiety supported on MXene in ORR catalysis.
The marriage of the FeN4 moiety and MXene can induce remarkable Fe 3d electron delocalization and spin‐state transition of Fe(II) ions. Less local electron density and higher spin state of Fe(II) centers greatly favor the Fe dz2 electron transfer, and lead to an easier oxygen adsorption and reduction on active FeN4 sites, and thus an enhanced oxygen reduction reaction activity. |
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AbstractList | Iron–nitrogen–carbon (Fe–N–C) is hitherto considered as one of the most satisfactory alternatives to platinum for the oxygen reduction reaction (ORR). Major efforts currently are devoted to the identification and maximization of carbon‐enclosed FeN4 moieties, which act as catalytically active centers. However, fine‐tuning of their intrinsic ORR activity remains a huge challenge. Herein, a twofold activity improvement of pristine Fe–N–C through introducing Ti3C2Tx MXene as a support is realized. A series of spectroscopy and magnetic measurements reveal that the marriage of FeN4 moiety and MXene can induce remarkable Fe 3d electron delocalization and spin‐state transition of Fe(II) ions. The lower local electron density and higher spin state of the Fe(II) centers greatly favor the Fe dz2 electron transfer, and lead to an easier oxygen adsorption and reduction on active FeN4 sites, and thus an enhanced ORR activity. The optimized catalyst shows a two‐ and fivefold higher specific ORR activity than those of pristine catalyst and Pt/C, respectively, even exceeding most Fe–N–C catalysts ever reported. This work opens up a new pathway in the rational design of Fe–N–C catalysts, and reflects the critical influence of Fe 3d electron states in FeN4 moiety supported on MXene in ORR catalysis. Iron–nitrogen–carbon (Fe–N–C) is hitherto considered as one of the most satisfactory alternatives to platinum for the oxygen reduction reaction (ORR). Major efforts currently are devoted to the identification and maximization of carbon‐enclosed FeN4 moieties, which act as catalytically active centers. However, fine‐tuning of their intrinsic ORR activity remains a huge challenge. Herein, a twofold activity improvement of pristine Fe–N–C through introducing Ti3C2Tx MXene as a support is realized. A series of spectroscopy and magnetic measurements reveal that the marriage of FeN4 moiety and MXene can induce remarkable Fe 3d electron delocalization and spin‐state transition of Fe(II) ions. The lower local electron density and higher spin state of the Fe(II) centers greatly favor the Fe dz2 electron transfer, and lead to an easier oxygen adsorption and reduction on active FeN4 sites, and thus an enhanced ORR activity. The optimized catalyst shows a two‐ and fivefold higher specific ORR activity than those of pristine catalyst and Pt/C, respectively, even exceeding most Fe–N–C catalysts ever reported. This work opens up a new pathway in the rational design of Fe–N–C catalysts, and reflects the critical influence of Fe 3d electron states in FeN4 moiety supported on MXene in ORR catalysis. The marriage of the FeN4 moiety and MXene can induce remarkable Fe 3d electron delocalization and spin‐state transition of Fe(II) ions. Less local electron density and higher spin state of Fe(II) centers greatly favor the Fe dz2 electron transfer, and lead to an easier oxygen adsorption and reduction on active FeN4 sites, and thus an enhanced oxygen reduction reaction activity. |
Author | Chen, Wei Mai, Liqiang Feng, Shihao Lv, Fan Zhuang, Zechao Li, Zilan Guo, Shaojun Zhou, Liang Luo, Mingchuan Zhu, Han Zhu, Jiexin Lang, Zhiquan |
Author_xml | – sequence: 1 givenname: Zilan surname: Li fullname: Li, Zilan organization: Wuhan University of Technology – sequence: 2 givenname: Zechao surname: Zhuang fullname: Zhuang, Zechao organization: Wuhan University of Technology – sequence: 3 givenname: Fan surname: Lv fullname: Lv, Fan organization: Peking University – sequence: 4 givenname: Han surname: Zhu fullname: Zhu, Han organization: Jiangnan University – sequence: 5 givenname: Liang surname: Zhou fullname: Zhou, Liang organization: Wuhan University of Technology – sequence: 6 givenname: Mingchuan surname: Luo fullname: Luo, Mingchuan organization: Peking University – sequence: 7 givenname: Jiexin surname: Zhu fullname: Zhu, Jiexin organization: Wuhan University of Technology – sequence: 8 givenname: Zhiquan surname: Lang fullname: Lang, Zhiquan organization: Wuhan University of Technology – sequence: 9 givenname: Shihao surname: Feng fullname: Feng, Shihao organization: Wuhan University of Technology – sequence: 10 givenname: Wei surname: Chen fullname: Chen, Wei email: chenwei2005@whut.edu.cn organization: Wuhan University of Technology – sequence: 11 givenname: Liqiang surname: Mai fullname: Mai, Liqiang email: mlq518@whut.edu.cn organization: Wuhan University of Technology – sequence: 12 givenname: Shaojun orcidid: 0000-0003-4427-6837 surname: Guo fullname: Guo, Shaojun email: guosj@pku.edu.cn organization: Peking University |
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SubjectTerms | Carbon Catalysis Catalysts electron delocalization Electron density Electron spin Electron states Electron transfer Iron iron–nitrogen–carbon Magnetic measurement Materials science MXenes Nitrogen oxygen reduction reaction Oxygen reduction reactions Platinum support effect |
Title | The Marriage of the FeN4 Moiety and MXene Boosts Oxygen Reduction Catalysis: Fe 3d Electron Delocalization Matters |
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