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Vanadium‐Incorporated Metallic (1‐T) Molybdenum Sulfide Nanoroses for High‐Energy‐Density Asymmetric Supercapacitors
Author(s) -
Lalwani Shubra,
Sharma Raj Kishore,
Singh Gurmeet,
Kim Hansung
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201902154
Subject(s) - vanadium , sulfide , supercapacitor , molybdenum , metal , capacitance , phase (matter) , vanadium oxide , chemistry , lithium (medication) , materials science , chemical engineering , inorganic chemistry , electrode , metallurgy , medicine , organic chemistry , engineering , endocrinology
The metallic phase (1T) of molybdenum sulfide is critical, pertaining to its exceptional interlayer structure and metastability, but forms up with low content. Herein, 1T‐phase‐prominent vanadium‐incorporated MoS 2 (MVS) nanoroses were synthesized through a hydrothermal process. A significant increase in 1T content (50 %) occurred with the addition of vanadium, enhancing the prompt diffusion of lithium ions by two orders. More exposed electroactive basal planes increased the number of redox active sites to 84 %, suggesting an excellent charge storage of 451 F g −1 at 1 A g −1 . On assembling MVS with MnO 2 to form an asymmetric cell (MnO 2 ∥MVS), a high energy density (62.7 Wh kg −1 at 428 W kg −1 ) with a threefold increment from the MVS‖MVS symmetric cell (21.8 Wh kg −1 at 255 Wkg −1 ) was achieved. The asymmetric cell also exhibited a superior cycling stability with 98 % retention of its capacitance after 10 000 cycles.