Guo Pengqian, Chen Weixin, Zhou Yifan, Xie Fangyan, Qian Guoyu, Jiang Pengfeng, He Deyan, Lu Xia
School of Materials, Sun Yat-sen University, Shenzhen, 518107, China.
Instrumental Analysis & Research Center, Sun Yat-sen University, Guangzhou, 510275, China.
Small. 2022 Dec;18(50):e2205158. doi: 10.1002/smll.202205158. Epub 2022 Oct 30.
Although lithium-sulfur batteries (LSBs) promise high theoretical energy density and potential cost effectiveness, their applications are severely impeded by the shuttling and sluggish redox kinetics of lithium polysulfides (LiPSs). In this context, a Co S @MoS heterostructure is sophisticatedly designed as an efficient catalytic host to boost the sulfur reduction reaction/evolution reaction (SRR/SER) kinetics and suppresses the LiPSs shuttling in LSBs. The results indicate that the electronic structure is manipulated in the Co S @MoS heterostructure, where the built-in electric fields (BIEFs) within the heterointerfaces enable the sufficient adsorption sites to accelerate the ionic diffusion/charge transfer kinetics for LiPSs redox, thus enhancing the sulfur conversion. By tuning the electronic structure, the metal d-band of Co S @MoS heterostructure plays an important role in adsorbing and catalyzing the conversion of LiPSs, thus promoting the reaction kinetics of the corresponding LSBs. This work unlocks the potential of heterostructures as promising catalysts to the design of high-energy and stabilized LSBs.
尽管锂硫电池（LSBs）具有较高的理论能量密度和潜在的成本效益，但其应用却受到多硫化锂（LiPSs）穿梭效应和缓慢的氧化还原动力学的严重阻碍。在此背景下，一种Co S@MoS异质结构被精心设计为一种高效的催化主体，以加速硫还原反应/析硫反应（SRR/SER）动力学，并抑制LiPSs在锂硫电池中的穿梭。结果表明，Co S@MoS异质结构中的电子结构得到了调控，异质界面内的内建电场（BIEFs）提供了充足的吸附位点，以加速LiPSs氧化还原的离子扩散/电荷转移动力学，从而提高硫转化率。通过调整电子结构，Co S@MoS异质结构的金属d带在吸附和催化LiPSs的转化中发挥了重要作用，从而促进了相应锂硫电池的反应动力学。这项工作揭示了异质结构作为有前景的催化剂在设计高能稳定锂硫电池方面的潜力。
