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Encapsulating Trogtalite CoSe 2 Nanobuds into BCN Nanotubes as High Storage Capacity Sodium Ion Battery Anodes
Author(s) -
Tabassum Hassina,
Zhi Chenxu,
Hussain Tanveer,
Qiu Tianjie,
Aftab Waseem,
Zou Ruqiang
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201901778
Subject(s) - materials science , anode , graphene , energy storage , chemical engineering , heteroatom , sodium ion battery , current density , battery (electricity) , ion , carbon nanotube , nanotechnology , faraday efficiency , electrode , chemistry , thermodynamics , organic chemistry , ring (chemistry) , power (physics) , physics , quantum mechanics , engineering
Trogtalite CoSe 2 nanobuds encapsulated into boron and nitrogen codoped graphene (BCN) nanotubes (CoSe 2 @BCN‐750) are synthesized via a concurrent thermal decomposition and selenization processes. The CoSe 2 @BCN‐750 nanotubes deliver an excellent storage capacity of 580 mA h g −1 at current density of 100 mA g −1 at 100th cycle, as the anode of a sodium ion battery. The CoSe 2 @BCN‐750 nanotubes exhibit a significant rate capability (100–2000 mA g −1 current density) and high stability (almost 98% storage retention after 4000 cycles at large current density of 8000 mA g −1 ). The reasons for these excellent storage properties are illuminated by theoretical calculations of the relevant models, and various possible Na + ion storage sites are identified through first‐principles calculations. These results demonstrate that the insertion of heteroatoms, B–C, N–C as well as CoSe 2 , into BCN tubes, enables the observed excellent adsorption energy of Na + ions in high energy storage devices, which supports the experimental results.