Zhu Hangyi, Li Zhiyong, Xu Feng, Qin Zhaoxia, Sun Rui, Wang Caihong, Lu Shengjun, Zhang Yufei, Fan Haosen
College of Materials Science and Metallurgy Engineering, Guizhou University, Guiyang 550025, PR China.
College of Materials Science and Metallurgy Engineering, Guizhou University, Guiyang 550025, PR China; School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China.
J Colloid Interface Sci. 2022 Apr;611:718-725. doi: 10.1016/j.jcis.2021.11.175. Epub 2021 Dec 1.
Core-shell structured Ni-ZIF-67@ZIF-8 derived bimetal selenides encapsulating into a 3D interpenetrating dual-carbon framework (NiSe@CoSe@C/CNTs) have been designed and prepared via carbonization and subsequent selenization processes. In this hierarchical structure, NiSe@CoSe nanocrystals were uniformly dispersed into the 3D carbon frameworkstructure/carbon nanotubes networks, which greatly enhanced the electronic conductivity and further enabled ultrafast Na-ion diffusion kinetics. When used as anode materials of sodium ion battery (SIB), The NiSe@CoSe@C/CNTs electrode delivered the excellent rate capability of 206 mA h g at 3 A g and marvelous cyclic stability with capacity retention of 243 mA h g after 600 cycles at 1 A g. This research provides a new way to prepare bimetallic selenide derived from MOF precursor with amazing heterostructure as the advanced anode materials for SIBs.
通过碳化和后续硒化过程，设计并制备了核壳结构的Ni-ZIF-67@ZIF-8衍生双金属硒化物，其被封装在三维互穿双碳框架（NiSe@CoSe@C/CNTs）中。在这种分级结构中，NiSe@CoSe纳米晶体均匀地分散在三维碳框架结构/碳纳米管网络中，这极大地提高了电子导电性，并进一步实现了超快的钠离子扩散动力学。当用作钠离子电池（SIB）的负极材料时，NiSe@CoSe@C/CNTs电极在3 A g下具有206 mA h g的优异倍率性能，并且在1 A g下循环600次后具有出色的循环稳定性，容量保持率为243 mA h g。该研究为制备源自MOF前驱体的双金属硒化物提供了一种新方法，该双金属硒化物具有惊人的异质结构，可作为SIBs的先进负极材料。
