Geng Pengbiao, Lin Yuxing, Du Meng, Wu Chunsheng, Luo Tianxing, Peng Yi, Wang Lei, Jiang Xinyuan, Wang Shuli, Zhang Xiuyun, Ni Lubin, Chen Shuangqiang, Shakouri Mohsen, Pang Huan
School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu, 225009, P. R. China.
College of Physics Science and Technology, Yangzhou University, Yangzhou, Jiangsu, 225009, P. R. China.
Adv Sci (Weinh). 2023 Aug;10(24):e2302215. doi: 10.1002/advs.202302215. Epub 2023 Jun 19.
Sulfur cathodes in Li-S batteries suffer significant volumetric expansion and lack of catalytic activity for polysulfide conversion. In this study, a confined self-reduction synthetic route is developed for preparing nanocomposites using diverse metal ions (Mn , Co , Ni , and Zn )-introduced Al-MIL-96 as precursors. The Ni -introduced Al-MIL-96-derived nanocomposite contains a "hardness unit", amorphous aluminum oxide framework, to restrain the volumetric expansion, and a "softness unit", Ni nanocrystals, to improve the catalytic activity. The oxygen-potential diagram theoretically explains why Ni is preferentially reduced. Postmortem microstructure characterization confirms the suppressive volume expansion. The in situ ultraviolet-visible measurements are performed to probe the catalytic activity of polysulfide conversion. This study provides a new perspective for designing nanocomposites with "hardness units" and "softness units" as sulfur or other catalyst hosts.
锂硫电池中的硫阴极会发生显著的体积膨胀，并且在多硫化物转化方面缺乏催化活性。在本研究中，开发了一种受限自还原合成路线，以使用引入不同金属离子（锰、钴、镍和锌）的Al-MIL-96作为前驱体制备纳米复合材料。引入镍的Al-MIL-96衍生纳米复合材料包含一个“硬度单元”，即非晶态氧化铝骨架，以抑制体积膨胀，以及一个“软度单元”，即镍纳米晶体，以提高催化活性。氧势图从理论上解释了为什么镍优先被还原。死后微观结构表征证实了对体积膨胀的抑制作用。进行原位紫外-可见测量以探测多硫化物转化的催化活性。本研究为设计具有“硬度单元”和“软度单元”作为硫或其他催化剂主体的纳米复合材料提供了新的视角。
