Journal
ACS NANO
Volume 14, Issue 9, Pages 11929-11938Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c05030
Keywords
lithium-sulfur batteries; VSe2-graphene heterostructure; Se vacancy; polysulfide adsorption; reaction kinetics
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Funding
- National Natural Science Foundation of China [51702225]
- National Key Research and Development Program [2016YFA0200103]
- Natural Science Foundation of Jiangsu Province [BK20170336]
- Beijing Municipal Science and Technology Commission [Z161100002116020]
- Suzhou Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Suzhou, China
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Electrocatalysts remain vitally important for the rational management of intermediate polysulfides (LiPSs) in the realm of Li-S batteries. In terms of transition-metal-based candidates, in situ evolution of electrocatalysts in the course of an electrochemical process has been acknowledged; nevertheless, consensus has not yet been reached on their real functional states as well as catalytic mechanisms. Herein, we report an all-chemical vapor deposition design of the defective vanadium diselenide (VSe2)-vertical graphene (VG) heterostructure on carbon cloth (CC) targeting a high-performance sulfur host. The electrochemistry induces the sulfurization of VSe2 to VS2 at Se vacancy sites, which propels the adsorption and conversion of LiPSs. Accordingly, the VSe2-VG@CC/S electrode harvests an excellent cycling stability at 5.0 C with a capacity decay of only 0.03990 per cycle over 800 cycles, accompanied by a high areal capacity of 4.9 mAh cm(-2) under an elevated sulfur loading of 9.6 mg cm(-2). Theoretical simulation combined with operando characterizations reveals the key role played by the Se vacancy with respect to the electrocatalyst evolution and LiPS regulation. This work offers insight into the rational design of heterostructure sulfur hosts throughout defect engineering.
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