Journal
ELECTROCHIMICA ACTA
Volume 330, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.135208
Keywords
NiS2@MoS2; ball-flower like composite; Core-shell structure; Supercapacitors
Categories
Funding
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX19_2101]
- Natural Science Foundation of Shandong Province, China [ZR2017MEM019]
- Testing Center of Yangzhou University
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the ball-flower like composite (NiS2@MoS2) was successfully synthesized by a convenient two-step hydrothermal method using Ni(NO3)(2)center dot 6H(2)O and (NH4)(6)Mo O-7(24)center dot 4H(2)O as precursors. MoS2 nanosheets, uniformly generated on NiS2 surface, increases the surface roughness and porosity, and accelerates the electrons and ions transfer of the composite. The synergistic effect of Mo and Ni improves the conductivity of the materials. Furthermore, by controlling the atomic ratio of Mo to Ni in precursors, the composite MN-1 (the molar ratio of MoS2 to NiS2 is 1:1) with the best capacity performance was obtained. The morphology and composition were characterized by a variety of means, such as TEM, SEM, XPS, XRD, BET and EDX. The electrochemical measurement results exhibited high specific capacity (848.2 C g(-1) at specific current of 1 A g(-1)) and good cycling stability (83.1% specific capacity retention after 10000 GCD cycles) of MN-1 in 6 M KOH. Furthermore, an asymmetric supercapacitor was assembled with MN-1 as positive electrode and activated carbon as negative electrode. When the power density is 0.8 kW kg(-1), its energy density reaches up to 37.2 Wh kg(-1). The present work may offer new design strategy for electrode materials. (C) 2019 Elsevier Ltd. All rights reserved.
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