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Issue 19, 2020
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A yolk–shell structured metal–organic framework with encapsulated iron-porphyrin and its derived bimetallic nitrogen-doped porous carbon for an efficient oxygen reduction reaction

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Abstract

A yolk–shell structured metal–organic framework (MOF) with encapsulated 5,10,15,20-tetraphenylporphyrinatoiron (FeTPP) in a zeolitic imidazolate framework (ZIF)-L-ZIF-8 is reported. ZIF-L with leaf-like morphology is used as a core, and FeTPP molecules will induce the partial decomposition of ZIF-L. The ZIF-8 shell is formed and encapsulates FeTPP in the yolk–shell structure by adding Zn ions and 2-methylimidazole (Hmim). After pyrolysis, FeCo bimetallic nitrogen doped porous carbon (FeCo–C/N) exhibits ORR performance comparable to commercial Pt/C (20 wt%), with a significant decrease in cost. Density functional theory (DFT) calculations demonstrate that the Fe site in FeCo–C/N contributes to the improved ORR performance by reducing the formation energy of *OOH formation. Thus, a Zn–air battery with FeCo–C/N as an electrocatalyst exhibits significantly improved performance (a high peak power density of 397.25 mW cm−2, and good rechargeable stability). The synthesis strategy presented in this work provides new opportunities for designing yolk–shell structured 2D MOFs for applications in energy conversion and storage.

Graphical abstract: A yolk–shell structured metal–organic framework with encapsulated iron-porphyrin and its derived bimetallic nitrogen-doped porous carbon for an efficient oxygen reduction reaction

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Article information


Submitted
23 Jan 2020
Accepted
26 Mar 2020
First published
27 Mar 2020

J. Mater. Chem. A, 2020,8, 9536-9544
Article type
Paper

A yolk–shell structured metal–organic framework with encapsulated iron-porphyrin and its derived bimetallic nitrogen-doped porous carbon for an efficient oxygen reduction reaction

C. Zhang, H. Yang, D. Zhong, Y. Xu, Y. Wang, Q. Yuan, Z. Liang, B. Wang, W. Zhang, H. Zheng, T. Cheng and R. Cao, J. Mater. Chem. A, 2020, 8, 9536
DOI: 10.1039/D0TA00962H

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