4.8 Article

Metal-Organic Frameworks-Derived Nitrogen-Doped Porous Carbon Nanocubes with Embedded Co Nanoparticles as Efficient Sulfur Immobilizers for Room Temperature Sodium-Sulfur Batteries

期刊

SMALL METHODS
卷 5, 期 8, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.202100455

关键词

catalyze redox kinetics; DFT calculations; hierarchical structures; metal-organic frameworks; sodium-sulfur batteries

资金

  1. National Natural Science Foundation of China [22076049, 51922042, 51872098]
  2. Fundamental Research Funds for the Central Universities of China [D2191120]
  3. Guangdong Innovative and Entrepreneurial Research Team Program [2014ZT05N200]

向作者/读者索取更多资源

A new type of 3D hierarchical porous carbonaceous nanocubes are reported as efficient sulfur hosts in room temperature sodium-sulfur batteries, demonstrating outstanding electrochemical performance. The integration of a well-dispersed Co NPs electro-catalyst within the porous architecture provides valuable insights for advanced room temperature sodium-sulfur batteries based on structure-adsorption-catalysis engineering.
Room temperature sodium-sulfur (RT Na-S) batteries are considered a promising candidate for energy-storage due to their high energy-density and low-cost. However, the shutting effect of polysulfides and sluggish kinetics of sulfur redox reactions still severely limit their practical implementation. Herein, a new type of 3D hierarchical porous carbonaceous nanocubes is reported as efficient sulfur hosts, composed of carbon nanotubes (CNT) and Co nanoparticles (NPs) uniformly embedded into a nitrogen-doped carbon matrix (NC). Because of the high specific surface area, large degree of graphitization, and the synergetic effects between Co NPs and N-doping, the as-designed CNTs/Co@NC electrodes not only significantly increase polysulfides immobilization, but also efficiently catalyze sulfur redox reactions, as confirmed by experimental results and DFT calculations. When tested in a RT Na-S battery, the S@CNTs/Co@NC-0.25 cathode demonstrates outstanding electrochemical performance, achieving high initial specific capacity of 1200.3 mAh g(-1) at 0.1 C, remarkable rate capability up to 5.0 C (474.2 mAh g(-1)), and superior cyclic performance of 450.5 mAh g(-1) (292 mAh g(-1)) after 400 cycles at 1.0 C (5.0 C). The integration of a 3D hierarchical porous architecture with well-dispersed Co NPs of an electro-catalyst provides valuable insights based on structure-adsorption-catalysis engineering for advanced RT Na-S batteries.

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