| Autor: |
Hariram M; Department of Physics, Malaviya National Institute of Technology Jaipur, Rajasthan 302017, India. deb.sarkar1985@gmail.com., Kumar M; Department of Physics, Malaviya National Institute of Technology Jaipur, Rajasthan 302017, India. deb.sarkar1985@gmail.com., Awasthi K; Department of Physics, Malaviya National Institute of Technology Jaipur, Rajasthan 302017, India. deb.sarkar1985@gmail.com., Sarkar D; Department of Physics, Malaviya National Institute of Technology Jaipur, Rajasthan 302017, India. deb.sarkar1985@gmail.com., Menezes PW; Material Chemistry Group for Thin Film Catalysis - CatLab, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany. prashanth.menezes@helmholtz-berlin.de.; Department of Chemistry, Technical University of Berlin, Straße des 17 Juni 135. Sekr. C2, 10623, Berlin, Germany. prashanth.menezes@mailbox.tu-berlin.de. |
| Abstrakt: |
Zinc-ion batteries (ZIBs) have attracted tremendous interest from the scientific community in recent years due to their extreme safety, cost-effectiveness, environmental benignity and the unique properties of the Zn anode. However, more suitable cathode materials are needed to achieve their potential widespread applications. MoS 2 , a 2D layered material with fascinating properties, could also serve as a cathode in ZIBs but is rarely studied due to its limited interlayer spacing, poor ionic/electronic conductivity and hydrophobicity. In this work, we report a facile hydrothermal method for synthesizing crystal water-intercalated MoS 2 nanosheets and their application in efficient Zn-ion storage. Morphological characterization reveals the average thickness of the nanosheets to be 15.2 nm. With a large interlayer spacing (0.79 nm), high 1T content (49.7%) and high defects, MoS 2 · n H 2 O achieves a high discharge capacity of 197 mA h g -1 at 0.1 A g -1 in an aqueous 2 M ZnSO 4 electrolyte. Moreover, it exhibits modest cyclic stability with 55% capacity retention after 1000 charge/discharge cycles. Furthermore, we evaluated the charge storage kinetics of crystal water-intercalated MoS 2 nanosheets and realized that the electrochemical reaction is diffusion dominated with a diffusion coefficient of 10 -10 to 10 -13 cm 2 s -1 in a 0.3 to 1.3 V potential window. This simple and cost-effective strategy for improving the performance of ZIBs by crystal water intercalation in 2D cathode materials will pave the way for their commercial-level grid-scale applications. |
