Universal design of three-dimensional porous graphene-iron based promotors for kinetically rationalized lithium-sulfur chemistry

IF 13.1 1区 化学 Q1 Energy
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Abstract

Lithium-sulfur (Li-S) batteries are widely deemed to be one of the most potential candidates for future secondary batteries because of their remarkable energy density. Nevertheless, notorious polysulfide shuttling and retarded sulfur reaction kinetics pose significant obstacles to the further application of Li-S batteries. While rationally designed highly active electrocatalysts can facilitate polysulfide conversion, the universal and scalable synthesis strategies need to be developed. Herein, a universal synthetic strategy to construct a series of three-dimensional (3D) porous graphene-iron (3DGr-Fe) based electrocatalysts involving 3DGr-FeP, 3DGr-Fe3C, and 3DGr-Fe3Se4 is exploited for manipulating the Li-S redox reactions. It has been observed that the implementation of a 3D porous Gr architecture leads to the well-designed conductive networks, while the uniformly dispersed iron nanoparticles introduce an abundance of active sites, fostering the lithium polysulfide conversion, thereby bolstering the overall electrochemical performance. The Li-S battery with the 3DGr-Fe based electrocatalyst exhibits remarkable capacity retention of 94.8% upon 100 times at 0.2 C. Moreover, the soft-packaged Li-S pouch cell based on such a 3DGr-Fe electrocatalyst delivers superior capacity of 1060.71 mA h g−1 and guarantees for the continuous 30 min work of fan toy. This investigation gives comprehensive insights into the design, synthesis, and mechanism of 3DGr-Fe based electrocatalysts with high activity toward efficient and durable Li-S batteries.

Abstract Image

通用设计三维多孔石墨烯-铁基促进剂,促进动力学合理的锂硫化学反应
锂硫(Li-S)电池因其卓越的能量密度而被广泛认为是未来二次电池中最具潜力的候选电池之一。然而,众所周知的多硫穿梭和迟缓的硫反应动力学对锂硫电池的进一步应用构成了重大障碍。虽然合理设计的高活性电催化剂可以促进多硫化物的转化,但还需要开发通用的、可扩展的合成策略。本文利用通用合成策略构建了一系列基于三维(3D)多孔石墨烯-铁(3DGr-Fe)的电催化剂,包括3DGr-FeP、3DGr-Fe3C和3DGr-Fe3Se4,用于操纵锂-S氧化还原反应。研究观察到,三维多孔 Gr 结构的实施带来了精心设计的导电网络,而均匀分布的铁纳米粒子则引入了大量的活性位点,促进了多硫化锂的转化,从而提高了整体电化学性能。此外,基于这种 3DGr-Fe 电催化剂的软包装锂电池可提供 1060.71 mA h g-1 的超大容量,并可保证风扇玩具连续工作 30 分钟。这项研究全面揭示了基于 3DGr-Fe 的高活性电催化剂的设计、合成和机理,有助于开发高效耐用的锂-S 电池。
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来源期刊
Journal of Energy Chemistry
Journal of Energy Chemistry CHEMISTRY, APPLIED-CHEMISTRY, PHYSICAL
CiteScore
19.10
自引率
8.40%
发文量
3631
审稿时长
15 days
期刊介绍: The Journal of Energy Chemistry, the official publication of Science Press and the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, serves as a platform for reporting creative research and innovative applications in energy chemistry. It mainly reports on creative researches and innovative applications of chemical conversions of fossil energy, carbon dioxide, electrochemical energy and hydrogen energy, as well as the conversions of biomass and solar energy related with chemical issues to promote academic exchanges in the field of energy chemistry and to accelerate the exploration, research and development of energy science and technologies. This journal focuses on original research papers covering various topics within energy chemistry worldwide, including: Optimized utilization of fossil energy Hydrogen energy Conversion and storage of electrochemical energy Capture, storage, and chemical conversion of carbon dioxide Materials and nanotechnologies for energy conversion and storage Chemistry in biomass conversion Chemistry in the utilization of solar energy
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