In:
ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2019-04, No. 6 ( 2019-06-30), p. 356-356
Abstract:
Highly Isolated Cobalt Sulfide Nanoparticles Encapsulated in 3D Hollow Nitrogen Doped Carbon Sheells for Superior Lithium and Sodium Storage Wei Huang, a, b Huihui Shangguan, b Christian Engelbrekt, a Xiaowen Zheng, b Fei Shen, a Xinxin Xiao, a Lijie Ci, b Pengchao Si b, * and Jingdong Zhang a, * a Department of Chemistry, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark. b SDU & Rice Joint Center for Carbon Nanomaterials, Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan 250061, P. R. China. Hollow materials derived from metal-organic frameworks (MOFs) present a class of promising electrode materials for energy storage technology. Herein, we report the design and nanoengineering of highly isolated cobalt sulfide nanoparticles embedded in hollow nitrogen-doped carbon shells (Co 9 S 8 /HNCS) for superior lithium and sodium storage. Initially, hollow intermediates with preserved cobalt component were prepared by simultaneously dissociating cobalt containing zeolitic-imidazolate-frameworks-67 (ZIF-67), and polymerizing dopamine in a Tris-HCl solution (pH = 8.5). The poly-dopamine (PDA) wrapped intermediates inherited the polyhedron structure of the ZIF-67 crystals. The final Co 9 S 8 /HNCS composite was obtained via a combined carbonization and sulfurization treatment of the intermediates, allowing the formation of hollow polyhedrons of nitrogen-doped carbon layers (900 ± 100 nm) derived from PDA and the encapsulation of highly monodispersed cobalt sulfide nanoparticles (11 ± 2 nm). This configuration not only shortened the ionic diffusion distance, and accommodated volume expansion during lithium or sodium ion insertion/extraction, but also promoted the overall electronic conductivity, and provided more active sites during cycling. As a result, Co 9 S 8 /HNCS composite exhibited an impressive reversible capacity of 755 mA h g -1 at 500 mA g -1 after 200 cycles for lithium ion storage, and capacities of 327 mA h g -1 at 500 mA g -1 after 200 cycles and 224 mA h g -1 at 1000 mA g -1 after 300 cycles for sodium ion storage. Essential factors associated with the structural stability and changes during cycling have been identified and the discharge/charge mechanism has been discussed. Figure 1
Type of Medium:
Online Resource
ISSN:
2151-2043
DOI:
10.1149/MA2019-04/6/356
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2019
detail.hit.zdb_id:
2438749-6
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