Zhengqing Ye, Ying Jiang, Tianyu Yang, Li Li, Feng Wu, Renjie Chen
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引用次数: 55
摘要
硫还原缓慢和硫化锂(Li2S)氧化阻碍了锂硫电池的广泛使用,锂硫电池是锂离子电池的有吸引力的替代品。作者提出过渡金属硒化物异质结(se - znse)催化加速了双向硫转化反应。结合同步加速器x射线吸收光谱和密度泛函数理论计算表明,具有电荷重分布和结构畸变的高活性异质界面有效地固定了硫种,促进了Li离子的扩散,降低了硫还原和Li2S氧化能垒。该催化剂具有面积容量大、倍率性能好、循环稳定性好等特点,在1700次循环中,每循环容量衰减率为0.027%。此外,锚定在石墨烯气凝胶(CoSe - ZnSe@G)上的se - znse异质结增强了高硫负载和贫电解质条件下的离子传输和催化活性。在电解质/硫比为3 μ L mg - 1时,实现了8.0 mAh cm - 2的高面容量。这项研究证明了双向催化异质结和结构工程对提高锂硫电池性能的重要性。
Engineering Catalytic CoSe–ZnSe Heterojunctions Anchored on Graphene Aerogels for Bidirectional Sulfur Conversion Reactions
Sluggish sulfur reduction and lithium sulfide (Li2S) oxidation prevent the widespread use of lithium–sulfur (Li–S) batteries, which are attractive alternatives to Li−ion batteries. The authors propose that a transition metal selenide heterojunction (CoSe–ZnSe) catalytically accelerates bidirectional sulfur conversion reactions. A combination of synchrotron X-ray absorption spectroscopy and density functional theory calculations show that a highly active heterointerface with charge redistribution and structure distortion effectively immobilizes sulfur species, facilitates Li ion diffusion, and decreases the sulfur reduction and Li2S oxidation energy barriers. The CoSe–ZnSe catalytic cathode exhibits high areal capacities, good rate capability, and superior cycling stability with capacity fading rate of 0.027% per cycle over 1700 cycles. Furthermore, CoSe–ZnSe heterojunctions anchored on graphene aerogels (CoSe–ZnSe@G) enhance ionic transport and catalytic activity under high sulfur loading and lean electrolyte conditions. A high areal capacity of 8.0 mAh cm−2 is achieved at an electrolyte/sulfur ratio of 3 µL mg−1. This study demonstrates the importance of bidirectional catalytic heterojunctions and structure engineering in boosting Li–S battery performances.
期刊介绍:
Advanced Science is a prestigious open access journal that focuses on interdisciplinary research in materials science, physics, chemistry, medical and life sciences, and engineering. The journal aims to promote cutting-edge research by employing a rigorous and impartial review process. It is committed to presenting research articles with the highest quality production standards, ensuring maximum accessibility of top scientific findings. With its vibrant and innovative publication platform, Advanced Science seeks to revolutionize the dissemination and organization of scientific knowledge.