N-rich carbon coated CoSnO3 derived from in situ construction of a Co-MOF with enhanced sodium storage performance

作者：Zou, Guoqiang; Hou, Hongshuai^*; Zhao, Ganggang; Ge, Peng; Yin, Dulin; Ji, Xiaobo

来源：Journal of Materials Chemistry A, 2018, 6(11): 4839-4847.

DOI：10.1039/c7ta10448k

• METAL-ORGANIC-FRAMEWORKS
• DOPED POROUS CARBON
• ANODE MATERIAL
• ION BATTERIES
• SUPERIOR RATE
• HIGH-CAPACITY
• LITHIUM
• COMPOSITE
• CO3O4
• NANOSPHERES

In this study, N-rich carbon coated interconnected CoSnO3 nanoboxes (CoSnO3-NCs) with controllable amounts of N-rich carbon ranging from 7.5% to 24.6% were firstly prepared by the carbonization of CoSnO3-MOFs. Impressively, the preparation of CoSnO3-MOFs has been realized for the first time by directly utilizing CoSnO3 as the precursor under solvent-free conditions, bridging between the cobalt(II) ion in the skeleton of CoSnO3 and the 2-methylimidazole. Interestingly, the growth of these CoSnO3-MOFs can be manipulated by changing the amount of 2-methylimidazole used, resulting in a tunable N-rich carbon content. Furthermore, the electrochemical storage behavior of these materials for SIBs was initially explored. Compared with the pure CoSnO3, the as-resulted CoSnO3-NC materials showed largely enhanced sodium storage performance with a reversible capacity of 493.9 mA h g(-1) at a current density of 0.1 A g(-1) after 100 cycles. Moreover, the as-prepared materials showed an excellent high rate storage performance with a remarkable capacity of 273.8 mA h g(-1) at 1 A g(-1) after 1000 cycles. This work provides a new approach for constructing Co-MOFs as well as providing an efficient N-rich carbon-coating route, which may be expanded to other Co-based oxides and can greatly expand the development of new species of Co-based MOFs.

• 出版日期2018-3-21
• 单位中南大学; 湖南师范大学