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Rationally Designed Fe-Tetrapyridophenazine Complex: A Promising Precursor to Single-Atom Fe Catalyst for Efficient Oxygen Reduction Reaction in High-Power Zn-Air Cells

Abstract

The development of low-cost and highly efficient single-atom oxygen reduction catalysts to replace platinum for fuel cells and metal-air cells is highly desirable but remains challenging. Herein, we report the fabrication of isolated single-atom Fe anchored on porous nitrogen-doped carbon from pyrolysis of a well-designed solely Fe-tetrapyridophenazine coordination complex. The N-riched bridging ligand, tetrapyridophenazine (tpphz) is firstly employed as a spatial isolation agent of Fe that suppresses its aggregation during high temperature pyrolysis, resulting in highly reactive and stable single-atom Fe ORR catalysts. The catalyst shows remarkable ORR activity with a half-wave potentials of 0.863 V versus the reversible hydrogen electrode (RHE) (21 mV more positive than that of commercial 20 wt % Pt/C) and excellent durability in 0.1 M KOH. While in acidic media, the Fe single atoms also demonstrate the ORR activity comparable to and stability much higher than those of Pt/C. Notably, Zn-air cell made using the as-prepared catalyst as the cathode provide a high open circuit voltage (1.53 V) and gravimetric energy density (947 Whkg–1), which is higher than commercial Pt/C based Zn-air cell (1.50 V, 828 Whkg–1). This work will open a new avenue to design single-atom catalysts for clean renewable energy storage and conversion devices.

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Publication details

The article was received on 30 May 2018, accepted on 10 Aug 2018 and first published on 13 Aug 2018


Article type: Paper
DOI: 10.1039/C8NR04372H
Citation: Nanoscale, 2018, Accepted Manuscript
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    Rationally Designed Fe-Tetrapyridophenazine Complex: A Promising Precursor to Single-Atom Fe Catalyst for Efficient Oxygen Reduction Reaction in High-Power Zn-Air Cells

    Z. Yang, C. Yuan and A. Xu, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR04372H

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