利用碳纳米管、石墨烯和金催化剂的锂氧电池

IF 6.5 3区 材料科学 Q2 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
Stanislav Levchenko, Giacomo Valente, Jusef Hassoun
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引用次数: 0

摘要

锂-氧(Li-O2)电池因其特有的电化学转换过程而被认为是锂离子电池的高能替代品,同时还具有成本低、对环境影响小的优点。然而,这种新兴电池仍需要提高稳定性和寿命,才能作为实用的储能系统使用。在这项工作中,我们研究了一种由多壁碳纳米管(MWCNTs)、少层石墨烯(FLG)和纳米金粉催化剂组成的电极材料,以提高锂-O2 电池在能量效率、循环寿命和稳定性方面的性能。形态、结构和电化学测试表明,该复合电极实际上可以促进氧还原反应(ORR)和氧进化反应(OER),并提高锂-O2 过程的可逆性,在 70 次循环中可获得 1000 mAh g-1 的容量。另一方面,测试还揭示了金在降低极化和延长电池寿命方面的作用。因此,研究结果表明,将具有不同形态的碳结合在一起是一种合适的结构,可以容纳锂-O2 反应产物并使其发生可逆反应。另一方面,研究结果也强调了更好地调整贵金属特性以进一步提高电池性能的必要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A Lithium-Oxygen Battery Exploiting Carbon Nanotubes, Graphene and Gold Catalyst

A Lithium-Oxygen Battery Exploiting Carbon Nanotubes, Graphene and Gold Catalyst

A Lithium-Oxygen Battery Exploiting Carbon Nanotubes, Graphene and Gold Catalyst

Lithium-oxygen (Li-O2) battery is considered a high-energy alternative to Li-ion one due its characteristic electrochemical conversion process, with the additional advantage of lower cost and environmental impact. However, this emerging battery still requires an enhancement of stability and lifespan to allow its use as a practical energy storage system. In this work we investigate an electrode material benefitting of multiwalled carbon nanotubes (MWCNTs), few layer graphene (FLG), and gold nano-powder catalyst to improve the Li-O2 battery performances in terms of energy efficiency, cycle life and stability. Morphological, structural, and electrochemical tests indicate that the composite electrode can actually boost the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), and enhance the Li-O2 process reversibility, with a capacity of 1000 mAh g−1 over 70 cycles. On the other hand, the tests reveal the role of the gold in decreasing the polarization and increasing the cell life. Therefore, the results suggest the combination of carbons with various morphologies as a suitable architecture for hosting the Li-O2 reaction products and allowing their reversible reaction. On the other hand, the results highlight the necessity for a better tuning the noble metal characteristics to further enhance the cell performances.

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来源期刊
Advanced Sustainable Systems
Advanced Sustainable Systems Environmental Science-General Environmental Science
CiteScore
10.80
自引率
4.20%
发文量
186
期刊介绍: Advanced Sustainable Systems, a part of the esteemed Advanced portfolio, serves as an interdisciplinary sustainability science journal. It focuses on impactful research in the advancement of sustainable, efficient, and less wasteful systems and technologies. Aligned with the UN's Sustainable Development Goals, the journal bridges knowledge gaps between fundamental research, implementation, and policy-making. Covering diverse topics such as climate change, food sustainability, environmental science, renewable energy, water, urban development, and socio-economic challenges, it contributes to the understanding and promotion of sustainable systems.
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