Bimetallic Alloy Air Cathode Promoting Superoxide Formation for High-Performance Na-Air Batteries

IF 13 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Small Pub Date : 2025-03-04 DOI:10.1002/smll.202500109

Wenwen Yin, Xing Zhi, Yanyan Li, Jiawei Ma, Bernt Johannessen, Fangxi Xie, Mingmei Wu

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Abstract

Sodium superoxide is considered the preferred discharge product for sodium-air batteries (SABs) due to the reversible electrochemistry of the O₂/O₂⁻ redox pair and the consequent low charge overpotential. However, air cathodes of SABs based on mono-metal systems have not yet achieved optimal adsorption of the discharge products, leading to suboptimal performance of SABs. In this study, we present FeCo bimetallic alloy particles anchored on carbon nanotubes (FeCo/C) as a demonstration of a bimetal-based air cathode for SABs. Na-air batteries with FeCo/C cathode can achieve a low overpotential gap of 500 mV, a high discharge capacity of 3392.20 mAh g⁻¹, and excellent cyclic stability over 200 cycles (800 h). Ex-situ spectroscopy confirms the successful formation of sodium superoxide as the main discharge product, establishing a clear correlation between excellent performance and discharge product composition and verifying the effectiveness of the bimetallic alloy cathode. Theoretical calculations further reveal that the bimetallic-based air cathode exhibits improved adsorption of sodium superoxide, significantly enhancing the performance of SABs. This work pioneers the use of bimetal alloy strategies to optimize discharge products in SABs, paving the way for their practical application.

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来源期刊

Small 工程技术-材料科学：综合

CiteScore

17.70

自引率

3.80%

发文量

1830

审稿时长

2.1 months

期刊介绍： Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments. With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology. Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.