Synthesis of spherical carbon beads with effective CO_2 capture capability is highly desirable for large scale application of CO2 sorption, but remains challenging. Herein, a facile and efficient strategy to prepare n...Synthesis of spherical carbon beads with effective CO_2 capture capability is highly desirable for large scale application of CO2 sorption, but remains challenging. Herein, a facile and efficient strategy to prepare nitrogen-doped hierarchically porous carbon spheres was developed via co-pyrolyzation of poly(vinylidene chloride) and melamine in alginate gel beads. In this approach, melamine not only serves as the nitrogen precursor, but also acts as a template for the macropores structures. The nitrogen contents in the hierarchically porous carbon spheres reach a high level, ranging from 11.8 wt% to 14.7 wt%, as the melamine amount increases. Owing to the enriched nitrogen functionalities and the special hierarchical porous structure, the carbon spheres exhibit an outstanding CO_2 capture performance, with the dynamic capacity of as much as about 7 wt% and a separation factor about 49 at 25 °C in a gas mixture of CO_2/N_2(0.5:99.5, v/v).展开更多
Lithium ion conducting membranes are the key materials for lithium batteries.The lithium ion conducting gel polymer electrolyte membrane(Li-GPEM)based on porous poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HF...Lithium ion conducting membranes are the key materials for lithium batteries.The lithium ion conducting gel polymer electrolyte membrane(Li-GPEM)based on porous poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP)matrix and cross-linked PEG network is pre-pared by a typical phase inversion process.By immersing theporousPVDF-HFPmembraneinliquidelectrolytecon-taining poly(ethylene glycol)diacrylate(PEGDA)and an initiator to absorb the liquid electrolyte at 25℃,and then thermally cross-linking at 60℃,the Li-GPEM is fabricated successfully.The measurements on its weight loss,mech-anical and electrochemical properties reveal that the obtained Li-GPEM has better overall performance than the liquid and blend gel systems used as conductive media in lithium batteries.The ionic conductivity of the fabricated Li-GPEM can reach as high as 2.25×10^(-3) S/cm at 25℃.展开更多
Intra porous fibrous membranes have enhanced metal ionic adsorption and oil separation abilities than those of intra nonporous fibrous membrane.In this paper,we prepared highly intra porous fibrous poly(vinylidene flu...Intra porous fibrous membranes have enhanced metal ionic adsorption and oil separation abilities than those of intra nonporous fibrous membrane.In this paper,we prepared highly intra porous fibrous poly(vinylidene fluoride)(PVDF)membranes using an innovated water-mediated electrospinning approach.FTIR-ATR and XRD techniques confirmed the conversion of non-polarα-phase to polarβ-phase in electrospun membranes.The porous fibrous membrane M–16 had adsorbed oil almost 120%and metal adsorption around 15%,12%,5%,13%respectively for Pb^(2+),Cd^(2+),Cu^(2+)and Zn^(2+),which are larger than the counterpart of nonporous M–18.The nonporous fibrous membranes have better peak to peak output voltage(Vp-Vp)2 to 3 times than the porous fibrous membranes(M–16).The results show apparent potential applications in wastewater/oil spill treatment as well as piezoelectric sensors.展开更多
基金supported by the National Key R&D Program of China (2016YFB0600902)the Dalian National Laboratory for Clean Energy (DNL180401)the National Natural Science Foundation of China (21925803)。
文摘Synthesis of spherical carbon beads with effective CO_2 capture capability is highly desirable for large scale application of CO2 sorption, but remains challenging. Herein, a facile and efficient strategy to prepare nitrogen-doped hierarchically porous carbon spheres was developed via co-pyrolyzation of poly(vinylidene chloride) and melamine in alginate gel beads. In this approach, melamine not only serves as the nitrogen precursor, but also acts as a template for the macropores structures. The nitrogen contents in the hierarchically porous carbon spheres reach a high level, ranging from 11.8 wt% to 14.7 wt%, as the melamine amount increases. Owing to the enriched nitrogen functionalities and the special hierarchical porous structure, the carbon spheres exhibit an outstanding CO_2 capture performance, with the dynamic capacity of as much as about 7 wt% and a separation factor about 49 at 25 °C in a gas mixture of CO_2/N_2(0.5:99.5, v/v).
基金This work is financially supported by the National Natural Science Foundation of China(Grant No.50433010)the State Key Development Program for Basic Research of China(Grant No.2003CB615705)+1 种基金the National High-Tech Research and Development Plan of China(Grant No.2006AA03Z233)the Open Project Program of Hubei Province Key Laboratory of Catalysis and Materials Science of South-Central University for Nationalities.
文摘Lithium ion conducting membranes are the key materials for lithium batteries.The lithium ion conducting gel polymer electrolyte membrane(Li-GPEM)based on porous poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP)matrix and cross-linked PEG network is pre-pared by a typical phase inversion process.By immersing theporousPVDF-HFPmembraneinliquidelectrolytecon-taining poly(ethylene glycol)diacrylate(PEGDA)and an initiator to absorb the liquid electrolyte at 25℃,and then thermally cross-linking at 60℃,the Li-GPEM is fabricated successfully.The measurements on its weight loss,mech-anical and electrochemical properties reveal that the obtained Li-GPEM has better overall performance than the liquid and blend gel systems used as conductive media in lithium batteries.The ionic conductivity of the fabricated Li-GPEM can reach as high as 2.25×10^(-3) S/cm at 25℃.
基金This work was supported by the Natural Science Foundation of China(Grant No.51372042,51872053)Guangdong Provincial Natural Science Foundation(2015A030308004)+1 种基金the NSFCGuangdong Joint Fund(Grant No.U1501246)the Dongguan City Frontier Research Project(2019622101006)and the Advanced Energy Science and Technology Guangdong Provincial Laboratory Foshan Branch-Foshan Xianhu Laboratory Open Fund-Key Project(Grant No.XHT2020-011).
文摘Intra porous fibrous membranes have enhanced metal ionic adsorption and oil separation abilities than those of intra nonporous fibrous membrane.In this paper,we prepared highly intra porous fibrous poly(vinylidene fluoride)(PVDF)membranes using an innovated water-mediated electrospinning approach.FTIR-ATR and XRD techniques confirmed the conversion of non-polarα-phase to polarβ-phase in electrospun membranes.The porous fibrous membrane M–16 had adsorbed oil almost 120%and metal adsorption around 15%,12%,5%,13%respectively for Pb^(2+),Cd^(2+),Cu^(2+)and Zn^(2+),which are larger than the counterpart of nonporous M–18.The nonporous fibrous membranes have better peak to peak output voltage(Vp-Vp)2 to 3 times than the porous fibrous membranes(M–16).The results show apparent potential applications in wastewater/oil spill treatment as well as piezoelectric sensors.
