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Angew Chem Int Ed Engl. 2017 Aug 7;56(33):9901-9905. doi: 10.1002/anie.201705778. Epub 2017 Jul 13.

Ni3 FeN-Supported Fe3 Pt Intermetallic Nanoalloy as a High-Performance Bifunctional Catalyst for Metal-Air Batteries.

Author information

1
Materials Science and Engineering Program & Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712, USA.
2
School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China.

Abstract

Electrocatalysts for both the oxygen reduction and evolution reactions (ORR and OER) are vital for the performances of rechargeable metal-air batteries. Herein, we report an advanced bifunctional oxygen electrocatalyst consisting of porous metallic nickel-iron nitride (Ni3 FeN) supporting ordered Fe3 Pt intermetallic nanoalloy. In this hybrid catalyst, the bimetallic nitride Ni3 FeN mainly contributes to the high activity for the OER while the ordered Fe3 Pt nanoalloy contributes to the excellent activity for the ORR. Robust Ni3 FeN-supported Fe3 Pt catalysts show superior catalytic performance to the state-of-the-art ORR catalyst (Pt/C) and OER catalyst (Ir/C). The Fe3 Pt/Ni3 FeN bifunctional catalyst enables Zn-air batteries to achieve a long-term cycling performance of over 480 h at 10 mA cm-2 with high efficiency. The extraordinarily high performance of the Fe3 Pt/Ni3 FeN bifunctional catalyst makes it a very promising air cathode in alkaline electrolyte.

KEYWORDS:

Zn-air battery; electrocatalysis; intermetallic phases; oxygen evolution reaction; oxygen reduction reaction

PMID:
28666066
DOI:
10.1002/anie.201705778

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