School of Chemical Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, P. R. China.
Nanoscale. 2017 Jul 20;9(28):10059-10066. doi: 10.1039/c7nr03187d.
In this paper, we report the successful design and synthesis of a hierarchically porous MoS/C composite aerogel by simple one-pot mass preparation. The synthesis involves the in situ formation of MoS nanosheets on agarose molecular chains, the gelation of MoS-deposited agarose monomers to generate a composite hydrogel, and in situ transformation of the composite hydrogel into a MoS/C composite aerogel through carbonization. This composite aerogel can be used as a high-performance electrode material for supercapacitors and lithium-ion batteries. When tested as a supercapacitor electrode, it achieves a high specific capacitance of 712.6 F g at 1 A g and 97.3% capacity retention after 13 000 cycles at 6 A g. In addition, as a lithium-ion battery electrode, it exhibits a superior rate capability (653.2 mA h g at 0.1 A g and 334.5 mA h g at 5.0 A g) and an ultrahigh capacity retention of nearly 100% after 1000 cycles at 1 A g. These performances may be ascribed to the unique structure of the MoS/C composite aerogel, such as hierarchical pores, (002) plane-expanded MoS and interconnected carbon networks embedded uniformly with MoS nanosheets. This work may provide a general and simple approach for mass preparation of composite aerogel materials and pave the way for promising materials applied in both supercapacitors and lithium-ion batteries.
本文通过简单的一锅法质量制备，成功设计并合成了一种具有分级多孔结构的 MoS/C 复合气凝胶。该合成方法涉及在琼脂糖分子链上原位形成 MoS 纳米片，将沉积有 MoS 的琼脂糖单体凝胶化生成复合水凝胶，以及通过碳化将复合水凝胶原位转化为 MoS/C 复合气凝胶。这种复合气凝胶可用作超级电容器和锂离子电池的高性能电极材料。当用作超级电容器电极时，在 6 A g 下经过 13000 次循环后，它在 1 A g 时具有 712.6 F g 的高比电容和 97.3%的容量保持率。此外，作为锂离子电池电极，它表现出优异的倍率性能（在 0.1 A g 时为 653.2 mA h g，在 5.0 A g 时为 334.5 mA h g），在 1 A g 下经过 1000 次循环后，容量保持率接近 100%。这些性能可能归因于 MoS/C 复合气凝胶的独特结构，如分级孔、（002）平面扩展 MoS 和均匀嵌入 MoS 纳米片的互联碳网络。这项工作可能为复合气凝胶材料的大规模制备提供一种通用且简单的方法，并为超级电容器和锂离子电池中应用的有前途的材料铺平道路。
