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 MoS2 (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 MnO2 to form an asymmetric cell (MnO2∥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.
Bibliographical noteFunding Information:
This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2019R1A6A1A11055660) and by a National Research Foundation (NRF) grant funded by the Ministry of Science, ICT, and Future Planning (NRF-2018M3A7B4071535).
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All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Chemical Engineering(all)
- Materials Science(all)