Iridium Cluster Decoration on Amorphous Cobalt Oxide-Coated Carbon Nanotubes for High-Performance Lithium-Oxygen Battery Cathodes

IF 12.1 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Small Pub Date : 2025-06-23 DOI:10.1002/smll.202503521
Yuqing Yao, Shang Wang, Xinyang Ma, Yuhang Han, Zirui Tong, Geng Li, Jiayun Feng, Malik Dilshad Khan, Neerish Revaprasadu, Qing Sun, Yanhong Tian
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Abstract

Lithium-oxygen batteries hold great promise for next-generation energy storage due to their exceptionally high theoretical energy density. However, their practical application is hindered by the sluggish kinetics associated with the oxygen reduction reaction and oxygen evolution reaction, resulting in severe voltage polarization and limited cycling stability. Herein, a simple solvent thermal reaction and a one-step reduction reaction is developed, where amorphous cobalt oxide (CoO) is uniformly coated on multi-walled carbon nanotubes (CNT) and further decorated with highly dispersed iridium (Ir) clusters. The amorphous CoO coatings preferentially nucleate at CNT defect sites, which not only passivates surface defects but also facilitates the homogeneous distribution of Ir clusters. This unique Ir/CoO@CNT architecture provides abundant active sites and promotes efficient electronic and ionic transport, thereby enhancing the electrocatalytic activity and overall battery performance. The synergistic effect between the highly active Ir clusters and the amorphous CoO, which accelerates reaction kinetics and stabilizes the electrode interface. As a result, the Ir/CoO@CNT cathode achieves a high discharge capacity of ≈6700 mAh g−1, with a low overpotential of 0.96 V and exhibits excellent cycling stability, sustaining over 150 cycles under a limited capacity of 500 mAh g−1 at 500 mA g−1.

Abstract Image

用于高性能锂氧电池阴极的非晶氧化钴涂层碳纳米管上的铱簇装饰
锂氧电池由于其极高的理论能量密度,在下一代储能领域有着巨大的前景。然而,由于氧还原反应和析氧反应相关的动力学缓慢,导致严重的电压极化和有限的循环稳定性,阻碍了它们的实际应用。本文提出了一种简单的溶剂热反应和一步还原反应,将无定形氧化钴(CoO)均匀涂覆在多壁碳纳米管(CNT)上,并进一步用高度分散的铱(Ir)簇进行修饰。非晶CoO涂层优先在碳纳米管缺陷处成核,这不仅钝化了表面缺陷,而且有利于Ir簇的均匀分布。这种独特的Ir/CoO@CNT结构提供了丰富的活性位点,促进了有效的电子和离子传输,从而提高了电催化活性和整体电池性能。高活性Ir团簇与无定形CoO之间的协同作用,加速了反应动力学,稳定了电极界面。结果表明,Ir/CoO@CNT阴极具有≈6700 mAh g - 1的高放电容量,过电位低至0.96 V,并具有优异的循环稳定性,在500 mA g - 1的500mah g - 1有限容量下可维持150次以上的循环。
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来源期刊
Small
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.
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