NiFe Alloyed Nanoparticles Encapsulated in Nitrogen Doped Carbon Nanotubes for Bifunctional Electrocatalysis Toward Rechargeable Zn‐Air Batteries. Issue 24 (15th October 2019)

• Record Type: Journal Article
• Authors: Chen, Yinghuan; Peng, Jin; Duan, Wentao; He, Guoqiang; Tang, Zhenghua
• Is Part Of: ChemCatChem. Volume 11:Issue 24(2019)
• Page Start: 5994
• Page End: 6001
• Publication Date: 2019-10-15
• Subjects: oxygen evolution reaction -- oxygen reduction reaction -- NiFe alloys -- nitrogen doped carbon nanotubes -- rechargeable zinc air batteries; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.201901337
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: Developing cost‐effective, efficient and durable electrocatalysts to replace the high cost and low poison resistant platinum‐group‐metal (PGM) catalysts to boost the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is critical for promoting the practical performance of zinc‐air batteries (ZABs). Herein, a series of NiFe alloyed nanoparticles encapsulated in nitrogen‐doped carbon nanotubes (Nix Fe100−x @N‐CNTs, where x denotes the Ni ratio in NiFe alloys) have been fabricated as bifunctional catalysts for both OER and ORR. Among the series, the Ni50 Fe50 @N‐CNTs sample exhibited the best oxygen reversible electrocatalytic performance, of which it possessed an overpotential of 318 mV at 10 mA cm −2 for OER and a half‐wave potential of 0.86 V for ORR. The ZAB cell using Ni50 Fe50 @N‐CNTs as an air‐cathode also showed a power density of 203.6 mW cm −2, and a specific capacity of 778 mA h g −1, outperforming the noble‐metal‐based Pt/C+IrO2 catalyst. In addition, such ZAB cell also demonstrated a superlong stable rechargeability over 200 h without structural deterioration, presenting promises for pushing forward into practical applications. Abstract : Electrocatalysis : NiFe alloyed nanoparticles encapsulated in nitrogen doped carbon nanotubes were prepared as oxygen reversible electrocatalysts for rechargeable zinc air batteries. Ni50 Fe50 /N‐CNTs exhibited the best OER and ORR performances in the series. When employed as air cathode, Ni50 Fe50 /N‐CNTs demonstrated superior properties in the primary rechargeable zinc air battery to the Pt/C+RuO2 catalyst.