Institute of Nanochemistry and Nanobiology, Shanghai University, Shanghai 200444, PR China.
Materials Genome Institute and International Centre for Quantum and Molecular Structures, Department of Physics, Shanghai University, Shanghai 200444, PR China.
J Colloid Interface Sci. 2019 Mar 7;538:116-124. doi: 10.1016/j.jcis.2018.11.098. Epub 2018 Nov 26.
The interfacial engineering plays an important role in enhancing the electrochemical properties of graphene-based hybrid materials for energy conversion and storage. Herein, we propose a facile interfacial engineering route for achieving a novel type of SnS/N-doped graphene (SnS/NG) composite with superior lithium storage capability. Interestingly, the SnS particles formed show two totally different morphologies including ultrasmall nanoparticles about 5 nm and ultrathin nanosheets, and they are strongly coupled with nitrogen-doped graphene, giving rise to a unique 0D/2D heterostructure. In the process, the multiple roles of the 3-aminophenol (AP) linker are well identified by combining the experimental results with the theoretical calculations, where a strong interface is successfully constructed between SnS and functionalized graphene. The electrochemical test results demonstrate that the as-made SnS/NG composite exhibits a high lithium storage capacity (1101.3 mAh g at 100 mA g), superior cycling stability (a capability fading of 0.04% per cycle for 200 cycles at 100 mA g), as well as a good rate retention. Such a unique hierarchical nanostructure and the strong interfacial interaction between 0D/2D SnS and nitrogen-doped graphene highlight the lithium storage performance of SnS/NG.
界面工程在提高用于能量转换和存储的基于石墨烯的杂化材料的电化学性能方面发挥着重要作用。在此,我们提出了一种简便的界面工程途径,以获得具有卓越储锂能力的新型 SnS/N-掺杂石墨烯(SnS/NG)复合材料。有趣的是,形成的 SnS 颗粒呈现出两种完全不同的形态,包括约 5nm 的超小纳米颗粒和超薄纳米片,它们与氮掺杂石墨烯强烈结合,形成独特的 0D/2D 异质结构。在这个过程中,通过将实验结果与理论计算相结合,充分确定了 3-氨基酚(AP)连接剂的多种作用,在 SnS 和功能化石墨烯之间成功构建了强界面。电化学测试结果表明,所制备的 SnS/NG 复合材料具有高的储锂容量(在 100mA/g 时为 1101.3mAh/g)、优异的循环稳定性(在 100mA/g 时 200 次循环的容量衰减率为 0.04%/循环)以及良好的倍率保持能力。这种独特的分级纳米结构和 0D/2D SnS 与氮掺杂石墨烯之间的强界面相互作用突出了 SnS/NG 的储锂性能。