Premium
A 3D Trilayered CNT/MoSe 2 /C Heterostructure with an Expanded MoSe 2 Interlayer Spacing for an Efficient Sodium Storage
Author(s) -
Yousaf Muhammad,
Wang Yunsong,
Chen Yijun,
Wang Zhipeng,
Firdous Attia,
Ali Zeeshan,
Mahmood Nasir,
Zou Ruqiang,
Guo Shaojun,
Han Ray P. S.
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.201900567
Subject(s) - materials science , heterojunction , anode , carbonization , gravimetric analysis , electrolyte , chemical engineering , annealing (glass) , nanotechnology , electrode , composite material , optoelectronics , scanning electron microscope , chemistry , organic chemistry , engineering
Freestanding composite structures with embedded transition metal dichalcogenides (TMDCs) as the active material are highly attractive in the development of advanced electrodes for energy storage devices. Most 3D electrodes consist of a bilayer design involving a core–shell combination. To further enhance the gravimetric and areal capacities, a 3D trilayer design is proposed that has MoSe 2 as the TMDC sandwiched in‐between an inner carbon nanotube (CNT) core and an outer carbon layer to form a CNT/MoSe 2 /C framework. The CNT core creates interconnected pathways for the e − /Na + conduction, while the conductive inert carbon layer not only protects the corrosive environment between the electrolyte and MoSe 2 but also is fully tunable for an optimized Na + storage. This unique heterostructure is synthesized via a solvothermal‐carbonization approach. Due to annealing under a confined structural configuration, MoSe 2 interlayer spaces are expanded to facilitate a faster Na + diffusion. It is shown that an ≈3 nm thick carbon layer yielded an optimized anode for a sodium‐ion battery. The 3D porosity of the heterostructure remains intact after an intense densification process to produce a high areal capacity of 4.0 mAh cm −2 and a high mass loading of 13.9 mg cm −2 with a gravimetric capacity of 347 mAh g −1 at 500 mA g −1 after 500 cycles.