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Polyoxometalates‐Based Metal–Organic Frameworks Made by Electrodeposition and Carbonization Methods as Cathodes and Anodes for Asymmetric Supercapacitors
Author(s) -
Liu YaoZhi,
Yao Wei,
Gan HongMei,
Sun ChunYi,
Su ZhongMin,
Wang XinLong
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201903664
Subject(s) - supercapacitor , anode , materials science , cathode , capacitance , carbonization , energy storage , polypyrrole , chemical engineering , metal organic framework , nanotechnology , electrode , composite material , polymer , chemistry , organic chemistry , power (physics) , polymerization , scanning electron microscope , physics , quantum mechanics , adsorption , engineering
Hybrid materials have obtained well‐deserved attention for energy storage devices, because they show high capacitances and high energy densities induced by the synergistic effect between complementary components. Polyoxometalate‐based metal–organic frameworks (POMOFs) possess the abundant redox‐active sites and ordered structures of polyoxometalates (POMs) and metal–organic frameworks (MOFs), respectively. Here, an asymmetric supercapacitor (ASC) NENU‐5/PPy/60//FeMo/C was fabricated in which both its electrodes are prepared from POMOF precursors. A typical POMOF material, NENU‐5, was first connected with polypyrrole (PPy) through electrodeposition to form the cathode material NENU‐5/PPy. Another representative POMOFs material, PMo 12 @MIL‐100, was carbonized to obtain the anode material FeMo/C. Cathode NENU‐5/PPy exhibited an extraordinary capacitance of 508.62 F g −1 (areal capacitance: 2034.51 mF cm −2 ). In addition, anode FeMo/C shows excellent cyclic stability attributed to its unique structure. Finally, benefiting from the outstanding capacitances and structural merits of the anode and cathode, assembled asymmetric supercapacitor NENU‐5/PPy/60//FeMo/C achieves an energy density of 1.12 mWh cm −3 at a power density output of 27.78 mW cm −3 , as well as a notable life of 10 000 cycles with an capacity retention of 80.62 %. Thus, the unique ASC is strongly competitive in high capacitance, long cycle life, and high energy‐required energy storage devices.