Jingwen Wang

Bio: Jingwen Wang is an academic researcher from University of Science and Technology of China. The author has contributed to research in topics: Materials science & Fire retardant. The author has an hindex of 3, co-authored 17 publications receiving 74 citations.

Fabrication of an anode composed of a N, S co-doped carbon nanotube hollow architecture with CoS2 confined within: toward Li and Na storage.

Abstract: Over the years, transition metal chalcogenides (TMCs) have attracted ample attention from researchers on account of their high theoretical capacity, through which they show great potential for use in lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). Nevertheless, there are some serious obstacles (particle pulverization and large volume change) still in the way to achieving satisfactory cycling performance and rate property. Here, we report the preparation of a N, S co-doped carbon nanotube hollow architecture confining CoS2 (CoS2/NSCNHF) derived from bimetal-organic-frameworks. The rationally designed structure possesses excellent Li+/Na+ storage performances. Further investigation of the Li+/Na+ storage behavior indicated the presence of a partial pseudocapacitive contribution, facilitating the fast Li+/Na+ interaction/extraction process and thus giving it superb electrochemical property. This work may represent an important step forward in the fabrication of MOF-derived hierarchical hybrids combined with a hollow structure and TMCs to help such TMCs achieve their potential in energy storage systems.

Flame-Retardant ADP/PEO Solid Polymer Electrolyte for Dendrite-Free and Long-Life Lithium Battery by Generating Al, P-rich SEI Layer.

Abstract: The poly(ethylene oxide) solid polymer electrolyte (PEO SPE) has recently received much attention, however, the organic components in the SPE are still flammable. In this paper, we find that the high efficiency halogen-free aluminum (Al) diethyl hypophosphite flame retardant (ADP) is effective in reducing the flammability of PEO SPE. The SEI layer containing Al and phosphorus (P) inhibits the growth of lithium dendrite and enhances the cycle life of the battery. The capacity of a LiFePO4/SPE/Li battery containing ADP is still 123.2 mAh g-1 at 1.0 C and the Coulombic efficiency is as high as 99.95% after 1000 cycles (60 °C). At the same time, Al, P-rich SEI can inhibit the growth of lithium dendrite and the cycle stability of the battery is further enhanced.

Photothermal-healing, Record Thermal Stability and Fire Safety Black Phosphorus-Boron Hybrid Nanocomposites: Mechanism of Phosphorus Fixation Effects and Charring Inspired by Cell Wall

Abstract: Inspired by the structure and good thermal resistance of cell walls in plants, we herein develop a life-cycle safe multifunctional nanocomposite of polycarbonate/black phosphorus-boron nanohybrid (PC/BP-B) with properties of photothermal-healing,...

Synthesis of a novel graphene conjugated covalent organic framework nanohybrid for enhancing the flame retardancy and mechanical properties of epoxy resins through synergistic effect

Abstract: A novel graphene conjugated covalent organic framework (AGO@COF) nanohybrid was synthesized by solvothermal method and used to enhance the flame retardancy and mechanical performances of epoxy resins (EP) through synergistic effect firstly. It is deduced from thermogravimetric analysis and cone calorimeter results that the obtained AGO@COF nanohybrid improves the flame retardancy of EP significantly. The time to peak heat release rate of EP increases by 17 s, the peak heat release rate and total heat release of EP decrease by 43.6 and 24.3% due to incorporation of 2 wt% AGO@COF. It is referred from thermogravimetric analysis-fourier transform infrared spectrometry results that the release of toxic gases and combustible volatiles during pyrolysis is also suppressed. As for mechanical performance of EP nanocomposites, the storage modulus of EP/2 wt% AGO@COF (34.66 GPa) in the glassy state increases by 23.8% compared with the neat epoxy (28.00 GPa). The possible mechanism for enhanced flame retardant and mechanical performances is proposed according to the test results. This work has opened up a new application for AGO@COF nanohybrid in the field of flame-retardant polymers.