Xiao Fengping, Yang Xuming, Wang Hongkang, Yu Denis Y W, Rogach Andrey L
Department of Materials Science and Engineering, and Center for Functional Photonics (CFP), City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region, P. R. China.
Department of Materials Science and Engineering, Southern University of Science and Technology, No. 1088 Xueyuan Road, Shenzhen 518055, Guangdong, P. R. China.
ACS Appl Mater Interfaces. 2020 Dec 9;12(49):54644-54652. doi: 10.1021/acsami.0c15793. Epub 2020 Nov 24.
We introduce a hierarchical nanostructure of CoS/N-doped carbon@MoS comprising two transition-metal sulfides CoS and MoS, with enhanced sodium storage performance in sodium-ion batteries. A micron-sized Co metal-organic framework (MOF) is transformed into a CoS/N-doped carbon composite, followed by a solvothermal growth of MoS nanosheets on the surface. The resulting composite material offers several specific advantages for sodium storage: (i) accelerated sodium-ion diffusion kinetics due to its heterogeneous interface; (ii) shortened ion diffusion path and exposed active sites for sodium storage due to its hierarchical nanosheet architecture; and (iii) homogeneous nitrogen doping of the MOF-derived carbon, which is beneficial for electronic conductivity. Due to these merits, this composite exhibits excellent electrochemical performance with a specific capacity of 596 mAh g after 100 cycles at 0.1 A g and 395 mAh g at 5.0 A g.
我们介绍了一种由两种过渡金属硫化物CoS和MoS₂组成的CoS/N掺杂碳@MoS₂分层纳米结构，其在钠离子电池中具有增强的储钠性能。将微米级的钴金属有机框架（MOF）转化为CoS/N掺杂碳复合材料，随后在其表面通过溶剂热法生长MoS₂纳米片。所得复合材料在储钠方面具有几个特定优势：（i）由于其异质界面，钠离子扩散动力学加快；（ii）由于其分层纳米片结构，离子扩散路径缩短且储钠活性位点暴露；（iii）MOF衍生碳的均匀氮掺杂，有利于电子传导。由于这些优点，这种复合材料表现出优异的电化学性能，在0.1 A g下循环100次后比容量为596 mAh g，在5.0 A g下为395 mAh g。
