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Boosting Oxygen Reaction Activity by Coupled Sulfides for High-Performance Rechargeable Metal-Air Battery

Abstract

Sluggish oxygen electrochemistry including both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) greatly restricts the performance of rechargeable metal-air battery. Herein we couple NiFe sulfide (NiFeS2) with S-doped graphene oxide (S-GO) via a simultaneous sulfurization strategy to dramatically improve both the OER and ORR activities. The NiFeS2/S-GO on glassy carbon yields an OER current density of 10 mA/cm2 at 1.48 V and an ORR current density of 3 mA/cm2 at 0.75 V (vs. RHE), giving an overvoltage difference as low as 0.73 V. When assembled in a rechargeable Zn-air battery, the battery with NiFeS2/S-GO air electrode exhibits steady charging potential (1.98 V) with very little decay in discharging potential (from 1.20 to 1.17 V) for 180 charging-discharging cycles at 10 mA/cm2. Our work shall provide new insights for the design of efficient bifunctional oxygen electrocatalysts for high-performance energy conversion and storage devices.

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Publication details

The article was received on 12 Sep 2018, accepted on 08 Oct 2018 and first published on 09 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA08862D
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Boosting Oxygen Reaction Activity by Coupled Sulfides for High-Performance Rechargeable Metal-Air Battery

    D. Zhou, Y. Jia, H. Yang, W. Xu, S. Kai, J. Zhang, S. Wang, Y. Kuang, B. Liu and X. Sun, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08862D

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