1. Precisely manipulated π–π stacking of catalytic exfoliated iron polyphthalocyanine/reduced graphene oxide hybrid via pyrolysis-free path.
- Author
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Hao, Rui, Chen, Jingjing, Hu, Jing, Gu, Shuai, Gan, Qingmeng, Li, Yingzhi, Wang, Zhiqiang, Luo, Wen, Yuan, Huimin, Liu, Guiyu, Yan, Chunliu, Zhang, Junjun, Liu, Kaiyu, Liu, Chen, and Lu, Zhouguang
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GRAPHENE oxide , *MOLECULAR structure , *ELECTRON delocalization , *METAL catalysts , *OXYGEN reduction , *IRON - Abstract
The precisely manipulated π–π stacking of the hybrid catalyst favors the specific prediction of the ORR active sites, which are the iron atoms in the form of natural Fe-N 4 that bind preferentially to the oxygen. [Display omitted] Metal macrocycles with well-defined molecular structures are ideal platforms for the in-depth study of electrochemical oxygen reduction reaction (ORR). Structural integrity of metal macrocycles is vital but remain challenging since the commonly used high-temperature pyrolysis would cause severe structure damage and unidentifiable active sites. Herein, we propose a pyrolysis-free strategy to precisely manipulate the exfoliated 2D iron polyphthalocyanine (FePPc) anchored on reduced graphene oxide (rGO) via π–π stacking using facile high-energy ball milling. A delocalized electron shift caused by π–π interaction is firstly found to be the mechanism of facilitating the remarkable ORR activity of this hybrid catalyst. The optimal FePPc@rGO-HE achieves superior half-wave potential (0.90 V) than 20 % Pt/C. This study offers a new insight in designing stable and high-performance metal macrocycle catalysts with well-defined active sites. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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