Polyoxometalates‐Based Metal–Organic Frameworks Made by Electrodeposition and Carbonization Methods as Cathodes and Anodes for Asymmetric Supercapacitors

Abstract

Hybridm aterials have obtained well-deserved attention for energy storage devices, because they show high capacitances and high energy densitiesi nduced by the synergistic effect between complementary components. Polyoxometalate-based metal-organic frameworks( POMOFs) possess the abundantr edox-active sites and ordered structures of polyoxometalates (POMs) and metal-organic frameworks (MOFs), respectively.Here, an asymmetric supercapacitor (ASC) NENU-5/PPy/60//FeMo/Cw as fabricated in which both its electrodes are prepared from POMOFp recursors. A typical POMOF material, NENU-5, was first connected with polypyrrole (PPy) through electrodeposition to form the cathode materialN ENU-5/PPy. Another representative POMOFs material,P Mo 12 @MIL-100, was carbonizedt oo btain the anode material FeMo/C. Cathode NENU-5/PPye xhibited an extraordinary capacitance of 508.62 Fg À1 (areal capacitance:2 034.51 mF cm À2 ). In addition, anode FeMo/C shows excellent cyclic stabilitya ttributed to its unique structure. Finally,b enefiting from the outstanding capacitances and structuralm erits of the anode and cathode, assembled asymmetrics upercapacitor NENU-5/PPy/60//FeMo/C achieves an energy density of 1.12 mWh cm À3 at ap ower density output of 27.78 mW cm À3 ,a sw ell as an otable 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 highe nergy-required energy storaged evices.Supporting information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Electrochemical investigation and amperometry determination iodate based on ionic liquid/polyoxotungstate/P-doped electrochemically reduced graphene oxide multi-component nanocomposite modified glassy carbon electrode

“…2,[12][13][14] The multiple redox properties make them attractive candidates in surface modication, electroanalysis, and electrocatalysis. 2,[13][14][15] Different methods have been developed to achieve chemically modied electrodes (CMEs) with POMs such as electrodeposition at a very negative potential, 16,17 adsorption, 18 entrapment into conducting, 19,20 or non-conducting polymers matrixes, 21,22 layer-by-layer self-assembly, 23,24 Langmuir-Blodgett (LB) technique, 25,26 preparation of self-assembled monolayer and multilayer thin-lms, 27 and bulk modication of carbon composites and carbon paste matrices. 28 However, the electrocatalytic activity of POMs-modied electrodes is limited due to their low stability in aqueous solutions 15,27,29 and low specic surface area.…”

Flexible/Stretchable Supercapacitors with Novel Functionality for Wearable Electronics

“…Stretchability can also be achieved through structural modifications. Bendable and stretchable supercapacitors can be fabricated using common electrode preparation methods including dip-coating, [64] layer-by-layer (LbL) assembly, [65] spray-coating, [66] and electrodeposition, [67] but with an architectural twist in the final configuration. Just a small architectural modification on previously reported high-performance materials enables the formation of stretchable devices with high performance.…”

Formation of hollow MoO 2 @C nano‐octahedrons using polyoxometalate‐based metal‐organic framework as a template for enhanced lithium‐ion batteries

“…Such specific surface area is lower than other reports about full core MoO 2 /C hybrid material since the hollow structure is shrinking much more than a full core material. 68 The Barrett-Joyner-Halenda (BJH) pore size distribution curve (the inset of Figure 4c) suggests that MoO 2 @C nano-octahedrons have a wide pore size distribution but mainly distribute at around 4 nm, which may significantly improve the property of LIB by accelerating the migration rate of lithium ions.…”

“…63,64 Based on traditional MOFs, polyoxometalate(POM)based MOFs (POMOF) provide an impetus for the synthesis of multifunctional materials 65 as the result of their high specific surface area, high thermal stability, extra chemical composition and a replaceable organic ligand. 56,66,67 68 Herein, we design a hollow MoO 2 @C nanooctahedrons material using a polyoxometalate-based MOF as a precursor, synthesized by introducing phosphomolybdic acid hydrate over the surface of Cu-BTC through replacing most of the Cu. Such structure is transformed into a structure with a porous surface through a sintering process at N 2 atmospheres.…”