Preparation and Carbon-Dependent Supercapacitive Behaviour of Nanohybrid Materials between Polyoxometalate and Porous Carbon Derived from Zeolitic Templates

Abstract

An electrochemical cell combining the energy storage characteristics of the chemical redox reaction and a physical capacitor effect presents advantages including high energy and power densities, and long durability. In this study, we prepared nanohybrid materials between polyoxometalate (POM) and porous carbon, which have different porous structures and pore sizes, using different zeolitic templates. The POM molecules were loaded inside the porous carbon, and these POM/carbon nanohybrid materials were used as cathode active materials for lithium-ion batteries (LIBs). The performance of these molecular cluster batteries (MCBs) was significantly dependent on the porous carbon. Operando X-ray absorption fine structure (XAFS) and 7 Li solid-state nuclear magnetic resonance (NMR) measurements of the POM/carbon-MCBs revealed that three-dimensional porous carbon with high surface areas can improve the performance. The results highlight the remarkable performance of porous carbon with a three-dimensionally-linked pore network structure as an additive for supercapacitors to realise high-performance energy storage devices.

The Cluster Design and Redox Behavior Characterization of Polyoxometalates for Redox Flow Batteries

“…In order to provide a better understanding of the structural changes of POMs in the process of electron storage and release, researchers not only used ex situ infrared spectrum, [75] ultraviolet‐visible absorption, [76,77] small‐angle X‐ray scattering [78,79] and electron paramagnetic resonance spectroscopies [80,81] to explore the underlying mechanisms of POMs’ redox processes, but also developed novel in‐operando Raman spectroscopy [82,83] and in situ NMR spectroscopy [84,85] …”

“…and electron paramagnetic resonance spectroscopies [80,81] to explore the underlying mechanisms of POMs' redox processes, but also developed novel in-operando Raman spectroscopy [82,83] and in situ NMR spectroscopy. [84,85] For example, Peake et al characterized POMs in different valence states by UV-Vis absorption spectroscopy. [86] As shown in Figure 4a [75] Firstly, by comparing the FT-IR of the reduced HPOM (HPOM was reduced with 18 electrons) and the reversed HPOM (the reduced HPOM was oxidized back to HPOM), they found that the structure of HPOM retain unchanged after re-oxidation.…”

One-Pot Synthesis and High Electrochemical Performance of CuS/Cu1.8S Nanocomposites as Anodes for Lithium-Ion Batteries

“…Because of the rapid development of human society, energy demand is increasing [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. Fossil fuels have gradually dried up and caused severe environmental pollution.…”

Evaluation of the Covalent Functionalization of Carbon Nano-Onions with Pyrene Moieties for Supercapacitor Applications

“…The use of carbon nanomaterials (CNs) has been quite popular for the construction of supercapacitors (SCs) [1][2][3][4][5], specifically in electrochemical double-layer capacitors (EDCLs) [6,7]. Carbon nanotubes (CNTs) and graphene shells are frequently used for energy storage, commonly as a hybrid metal type material [8][9][10].…”