Iron phthalocyanine with coordination induced electronic localization to boost oxygen reduction reaction

Kejun Chen, Kang Liu, Pengda An, Huangjingwei Li, Yiyang Lin, Junhua Hu, Chuankun Jia, Junwei Fu, Hongmei Li, Hui Liu, Zhang Lin, Wenzhang Li, Jiahang Li, Ying-Rui Lu, Ting-Shan Chan, Ning Zhang and Min Liu ()
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Kejun Chen: Central South University
Kang Liu: Central South University
Pengda An: Central South University
Huangjingwei Li: Central South University
Yiyang Lin: Central South University
Junhua Hu: Zhengzhou University
Chuankun Jia: Changsha University of Science & Technology
Junwei Fu: Central South University
Hongmei Li: Central South University
Hui Liu: Central South University
Zhang Lin: Central South University
Wenzhang Li: Central South University
Jiahang Li: Changjun High School of Changsha
Ying-Rui Lu: National Synchrotron Radiation Research Center
Ting-Shan Chan: National Synchrotron Radiation Research Center
Ning Zhang: Central South University
Min Liu: Central South University

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Iron phthalocyanine (FePc) is a promising non-precious catalyst for the oxygen reduction reaction (ORR). Unfortunately, FePc with plane-symmetric FeN4 site usually exhibits an unsatisfactory ORR activity due to its poor O2 adsorption and activation. Here, we report an axial Fe–O coordination induced electronic localization strategy to improve its O2 adsorption, activation and thus the ORR performance. Theoretical calculations indicate that the Fe–O coordination evokes the electronic localization among the axial direction of O–FeN4 sites to enhance O2 adsorption and activation. To realize this speculation, FePc is coordinated with an oxidized carbon. Synchrotron X-ray absorption and Mössbauer spectra validate Fe–O coordination between FePc and carbon. The obtained catalyst exhibits fast kinetics for O2 adsorption and activation with an ultralow Tafel slope of 27.5 mV dec−1 and a remarkable half-wave potential of 0.90 V. This work offers a new strategy to regulate catalytic sites for better performance.

Date: 2020
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DOI: 10.1038/s41467-020-18062-y

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