Continuous amino-functionalized University of Oslo 66 membranes as efficacious polysulfide barriers for lithium−sulfur batteries

The shuttle effect of soluble polysulfides is a serious problem impeding the development of lithium−sulfur batteries.Herein,continuous amino-functionalized University of Oslo 66 membranes supported on carbon nanotube films are proposed as ion-permselective interlayers that overcome these issues and show outstanding suppression of the polysulfide shuttle effect.The proposed membrane material has appropriately sized pores,and can act as ionic sieves and serve as barriers to polysulfides transport while allowing the passage of lithium ions during electrochemical cycles,thereby validly preventing the shuttling of polysulfides.Moreover,a fast catalytic conversion of polysulfides is also achieved with the asdeveloped interlayer.Therefore,lithium−sulfur batteries with this interlayer show a desirable initial capacity of 999.21 mAh·g^(-1)at 1 C and a durable cyclic stability with a decay rate of only 0.04%per cycle over 300 cycles.Moreover,a high area capacity of 4.82 mAh·cm^(-2)is also obtained even under increased sulfur loading(5.12 mg·cm^(-2))and a lean-electrolyte condition(E/S=4.8μL·mg^(-1)).

Amino-functionalized magnetic nanoparticles for CO_(2) capture

CO_(2)accumulation is inducing an effect of global warming.Adsorption using solid sorbents is proving as an effective strategy for CO_(2)capture and reuse.The aim of this study was to develop amino-functionalized magnetic nanoparticles by depositing various amines through coprecipitation or impregnation-sonication.Structural characteristics were studied through SEM,BET and XRD analyses,evidencing coarse particles with low crystallinity and surface areas of 100–150 m2 g−1,while FT-IR confirmed CO_(2)interacting with substrate.The load of functional group,particles stability,and CO_(2)sorption capacity were assessed through elemental and thermogravimetric analysis.It was found that loads of functional groups ranging from 1.6 to 6.1 wt.%.were deposited,and most samples showed sound stability up to 100°C.Sorption capacities were in the range 0.2–1.5 g gNH2−1,the highest being 1.46 g gNH2−1 forɛ-aminocaproic acid.Such sample also exhibited good recyclability,with a performance drop of 11%after many cycles.CO_(2)uptake decreased with increasing temperature in the range 25–45°C,suggesting a chemical bond between CO_(2)and amines.Amino functionalized particles could thus be an interesting solution for CO_(2)capture and utilization thanks to fast kinetics,recyclability,and ease of separation.