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Nanohybridization of CoS 2 /MoS 2 Heterostructure with Polyoxometalate on Functionalized Reduced Graphene Oxide for High-Performance LIBs.

Qian LiMingqi XuTong WangHaijun WangJingwen SunJing-Quan Sha
Published in: Chemistry (Weinheim an der Bergstrasse, Germany) (2022)
To address the poor cycling stability and low rate capability of MoS 2 as electrode materials for lithium-ion batteries (LIBs), herein, the CoS 2 /MoS 2 /PDDA-rGO/PMo 12 nanocomposites are constructed via a simple hydrothermal process, combining the advantages of all three, namely, CoS 2 /MoS 2 heterojunction and polyoxometalates (POMs) provide abundant catalytically active sites and increase the multi-electron transfer ability, and the positively charged poly(diallyldimethylammonium chloride) modified reduced graphene oxide (PDDA-rGO) improve electronic conductivity and effectively prevent the aggregation of MoS 2 , meanwhile stabilize the negatively charged [PMo 12 O 40 ] 3- . After the electrochemical testing, the resulting CoS 2 /MoS 2 /PDDA-rGO/PMo 12 nanocomposite achieved 1055 mA h g -1 initial specific capacities and stabilized at 740 mA h g -1 after 150 cycles at 100 mA g -1 current density. And the specific capacities of MoS 2 , MoS 2 /PDDA-rGO, CoS 2 /MoS 2 , and CoS 2 /MoS 2 /PDDA-rGO were 201, 421, 518, and 589 at 100 mA g -1 after 150 cycles, respectively. The fact of the greatly improving capacity of MoS 2 -based nanocomposites suggests its potential for high performance electrode materials of LIBs. Moreover, the lithium storage mechanism of CoS 2 /MoS 2 /PDDA-rGO/PMo 12 has been discussed on the basis of cyclic voltammetry with different scan rates.
Keyphrases
  • reduced graphene oxide
  • gold nanoparticles
  • quantum dots
  • visible light
  • mass spectrometry
  • high intensity
  • heavy metals
  • ionic liquid