期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 882, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2021.115017
关键词
Polyoxotungstates (POTs); Inorganic-organic hybrid compounds; Metal active site; Electrochemical capacitor
资金
- Major Research Plan National Natural Science Foundation of China [92061102]
- National Natural Science Foundation of China [21701037]
- Outstanding Youth Project of Natural Science Foundation of in Heilongjiang Province [YQ2020B005]
- Postdoctoral Science Foundation of China [2017M611380]
- University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province [UNPYSCT-2018213]
- Outstanding Youth Project of Natural Science Foundation in Heilongjiang Province [YQ2020B005]
Five new polyoxotungstates-based NiII/CoII-containing 3D inorganic-organic hybrid compounds were synthesized and explored as pseudocapacitive electrode materials. These compounds exhibit high specific capacitance and low capacitance loss at high charge/discharge current density, with CoW12-Ni8 showing the best performance and potential application in energy functional materials.
Herein, five new polyoxotungstates (POTs)-based NiII/CoII-containing 3D inorganic-organic hybrid compounds, [H5 (SiW9VIW3VO40)3Ni8(H2O)12(atrz)12].12H2O (SiW12-Ni8), [H2(PW9VIW3VO40)3Ni8(H2O)12(atrz)12]1/3.4H2O (PW12-Ni8), [H11(CoW9VIW3VO40) 3Ni8(H2O)12(atrz]12].12H2O (CoW12-Ni8), [H11 (CoW9VIW3VO40) 3Co8(H2O)12(atrz)12].12H2O (CoW12-Co8), [H2(PW9VIW3VO40)3Co8(H2O)12(atrz)12] 1/3.4H2O (PW12-Co8) (atrz = 4-amino-1,2,4-triazole) have been synthesized via hydrothermal reaction and explored as pseudocapacitive electrode materials. Single-crystal X-ray diffraction displays these compounds have isostructural three-dimensional (3D) configuration and possess a (3,4)-connected (83)4(72. 82)3 topology structrue. Compared to others, CoW12-Ni8 as electrode materials shows the highest specific capacitance (526.1 F g-1 at 1.0 A g-1) and only experiences 16% capacitance loss at a high charge/discharge current density of 10 A g-1 after 1000 cycles. The capacitance ability of these POTs-based compounds is mainly dominated by the substituted heteroatoms (Co, Si, or P) in POTs and the coordinated metal (NiII or CoII) in the adjacent building blocks. This work may develop a new path to optimize the performance of POTsbased energy functional materials. Superscript/Subscript Available
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