"Highly active sites of low spin Fe<sup>Ⅱ</sup>N<sub>4</sub> species: T" by Huizhu Cai, Bingbing Chen et al.

Article Title

Highly active sites of low spin Fe^ⅡN₄ species: The identification and the ORR performance

Authors

Huizhu Cai, State Key Laboratory of Fine Chemicals, College of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
Bingbing Chen, State Key Laboratory of Fine Chemicals, College of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
Xiao Zhang, State Key Laboratory of Fine Chemicals, College of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
Yuchen Deng, College of Chemistry and Molecular Engineering and College of Engineering, Peking University, Beijing 100871, China
Dequan Xiao, Center for Integrative Materials Discovery, Department of Chemistry and Chemical Engineering, University of New Haven, CT 06516, USA
Ding Ma, College of Chemistry and Molecular Engineering and College of Engineering, Peking University, Beijing 100871, China
Chuan Shi, State Key Laboratory of Fine Chemicals, College of Chemical Engineering, Dalian University of Technology, Dalian 116024, China

Keywords

single sites of FeN4, oxygen reduction reaction, structure-performance correlation, electrocatalysis

Abstract

Over recent years, catalytic materials of Fe-N-C species have been recognized being active for oxygen reduction reaction (ORR). However, the identification of active site remains challenging as it generally involves a pyrolysis process and mixed components being obtained. Herein Fe3C/C and Fe2N/C samples were synthesized by temperature programmed reduction of Fe precursors in 15% CH4/H2 and pure NH3, respectively. By acid leaching of Fe2N/C sample, only single sites of FeN4 species were presented, providing an ideal model for identification of catalytic functions of the single sites of FeN4 in ORR. A correlation was conducted between the concentration of FeⅡN4 in low spin state by Mössbauer spectra and the kinetic current density at 0.8 V in alkaline media, and such a structure-performance correlation assures the catalytic roles of low spin FeⅡN4 species as highly active sites for the ORR.

DOI

https://doi.org/10.1007/s12274-020-3054-8

Publisher

Tsinghua University Press

Recommended Citation

Huizhu Cai, Bingbing Chen, Xiao Zhang, Yuchen Deng, Dequan Xiao, Ding Ma, Chuan Shi. Highly active sites of low spin Fe^ⅡN₄ species: The identification and the ORR performance. Nano Research 2021, 14(1): 122-130.

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