期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 824, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.153936
关键词
Molybdenum disulfide; Ferrous disulfide; Supercapacitor electrode; Density functional theory calculation
资金
- National Natural Science Foundation of China, China [21373047]
- Graduate Innovation Program of Jiangsu Province, China [KYCX18_0080]
- Fundamental Research Funds for the Central Universities, China [2242018K41024]
- Priority Academic Program Development of Jiangsu Higher Education Institutions, China
Electroactive FeS2-modified MoS2 (FeS2/MoS2) nanosheet grown on Mo foil is designed as supercapacitor electrode material. FeS2/MoS(2 )nanosheet is crosslinked to form nanoporous microstructure. Density functional theory calculation reveals FeS2/MoS2 exhibits much narrowed bandgap and high density of states at the Fermi level, suggesting highly improved conductivity. The charge transfers resistance decreases from 1.375 Omega of MoS2 to 0.4167 Omega of FeS2/MoS2. FeS2/MoS(2 )exhibits higher specific capacity (495 and 394 mF cm(-2)) than MoS2 (132 and 218.1 mF cm(-2)) and FeS2 (315 and 286.5 mF cm(-2)) at 1.0 mA cm(-2) in 3.0 M KOH and 0.5 M Na2SO4. The rate capacity retention is enhanced from 57.8% of MoS2 and 73.3% of FeS2 to 76.14% of FeS2/MoS2 in 0.5 M Na2SO4 when current density increases from 1 to 10 mA cm(-2), indicating its improved rate capability. The cycling capacity retention keeps 100.2% of MoS2 and 100.7% of FeS2/MoS(2 )for 5000 cycles at 5 mA cm(-2) in 0.5 M Na2SO4, indicating the similar cycling stability. An asymmetric solid-state supercapacitor using FeS2/MoS2 anode, exfoliated graphite carbon paper cathode and NaMoO4-Na2SO4-PVA gel electrolyte achieves specific capacity of 1.88 F cm(-3) (112.8 mF cm(-2)) at 1.0 mA cm(-2), energy density of 0.936 mWh cm(-3) (56.56 mWh cm(-2)), capacity retention of 97.8% after 5000 cycles at 5.0 mA cm(-2) and 1.9 V output voltage. (C) 2020 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据