Recently,CoCO_(3)has attracted enormous attention as anodes for lithium-ion batteries(LIBs),benefiting from its high theoretical capacity and simple synthesis.However,the modest electronic conductivity and structural ...Recently,CoCO_(3)has attracted enormous attention as anodes for lithium-ion batteries(LIBs),benefiting from its high theoretical capacity and simple synthesis.However,the modest electronic conductivity and structural instability over cycling hinder its wider applications.To well address the intrinsic issues,we explored a precipitantfree hydrothermal methodology for mass production of spindle-like CoCO_(3)/reduced graphene oxide(S-CoCO_(3)/rGO)toward advanced LIBs as a hybrid anode.The dimethylformamide plays a significant role of"two birds(i.e.,solvent and precipitant)with one stone"in the formation of the S-CoCO_(3)/rGO,greatly improving its practical applicability.The purposeful introduction of rGO nanosheets as a two-dimensional flexible conductive network enhances the conductivity and stability of the S-CoCO_(3).It is the structural and compositional merits for LIBs that endow the S-CoCO3/rGO with remarkable lithium-storage performance in terms of enhanced interfacial storage capacity,high-rate reversible capacities(803 mAh·g^(-1)at 2.0 A·g^(-1))and long-duration capacity retention of 82.1%over 2000 consecutive cycles at 2.0 A·g^(-1).More significantly,the simple yet efficient avenue here promises enormous commercial prospect of the S-CoCO_(3)/rGO in next-generation LIBs.展开更多
We studied numerically the temperature dependent extraordinary terahertz transmission through niobium nitride(NbN) film perforated with subwavelength spindle-like apertures. Both the resonant frequency and intensity o...We studied numerically the temperature dependent extraordinary terahertz transmission through niobium nitride(NbN) film perforated with subwavelength spindle-like apertures. Both the resonant frequency and intensity of extraordinary terahertz transmission peaks can be greatly modified by the transition of NbN film from the normal state to the superconducting state. An enhancement of the(±1, 0) NbN/magnesium oxide(MgO) peak intensity as high as 200% is demonstrated due to the combined contribution of both the superconducting transition and the excitation of localized surface plasmons(LSPs) around the apertures. The extraordinary terahertz transmission through spindle-like hole arrays patterned on the NbN film can pave the way for us to explore novel active tuning devices.展开更多
Diesel engines are widely used in automobiles,ships,and other fields because of their good economy and power performance;however,the use of diesel engines is often accompanied by the production of the soot particles,w...Diesel engines are widely used in automobiles,ships,and other fields because of their good economy and power performance;however,the use of diesel engines is often accompanied by the production of the soot particles,which can cause significant harm to the environment and humans;thus,catalytically eliminating soot particles is of great significance.A series of spindle-like CeO_(2)catalysts loaded with different contents of K and Co mixed oxides(K_(x)Co_(y)O_(δ)/CeO_(2))was successfully prepared via hydrothermal and incipient wetness methods.Due to the loading of K and Co mixed oxides on the surface of CeO_(2),the K_(x)Co_(y)O_(δ)/CeO_(2)catalysts have abundant oxygen vacancies,good redox performance,and NO oxidation ability.At the same time,the K_(x)Co_(y)O_(δ)/CeO_(2)catalysts have a special spindle-like morphology that helps the catalyst generate an increased number of active sites and oxygen vacancies;therefore,they have excellent catalytic performance for soot combustion reaction,including activity,stability,and water and sulfur resistance.Among them,the K_(0.05)Co_(0.05)O_(δ)/CeO_(2)catalyst has the highest soot combustion activity,with T_(10),T_(50),and T_(90)values of 287,325,and 349~℃,respectively.Due to the excellent catalytic performance,as well as the easy availability and low cost of the raw materials,the K_(x)Co_(y)O_(δ)/CeO_(2)catalysts have good development prospects in the field of catalytic soot elimination.展开更多
Copolymers with super segregated structure of hydrophilic methoxy poly（ethylene glycol） （mPEG） and fluorophilic poly（1H,1H,2H,2H-perfluorodecyl acrylate） （PFA） were prepared. And just because of this super seg...Copolymers with super segregated structure of hydrophilic methoxy poly（ethylene glycol） （mPEG） and fluorophilic poly（1H,1H,2H,2H-perfluorodecyl acrylate） （PFA） were prepared. And just because of this super segregated structure which was resulted from the extremely strong incompatibility between the two blocks, several interesting self- assembly behaviors of the copolymers were displayed and studied under different conditions. Transmission electron microscope （TEM） showed that with the increase of PFA in the polymerization system, the incompatibility in this super segregated structure became stronger, and the self-assembly behavior changed from ball-like or rod-like to vesicles, and finally collapsed to sheet-like. The self-assembly behavior changed likewise when the initial concentration increased. And the interesting formation of these barrel-like and spindle-like vesicles was finally studied with different cooling speeds. It＇s finally found that with this super segregation structure, these new self-assembly morphology might be formed due to the extremely strong incompatibility between mPEG and PFA segments.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.51772127 and 51772131)the Taishan Scholars(No.ts201712050)+3 种基金the Major Program of Shandong Province Natural Science Foundation(No.ZR2018ZB0317)the Natural Science Doctoral Foundation ofShandong Province(No.ZR2019BEM038)the Natural Science Doctoral Foundation of the University of Jinan(No.XBS1830)the Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong。
文摘Recently,CoCO_(3)has attracted enormous attention as anodes for lithium-ion batteries(LIBs),benefiting from its high theoretical capacity and simple synthesis.However,the modest electronic conductivity and structural instability over cycling hinder its wider applications.To well address the intrinsic issues,we explored a precipitantfree hydrothermal methodology for mass production of spindle-like CoCO_(3)/reduced graphene oxide(S-CoCO_(3)/rGO)toward advanced LIBs as a hybrid anode.The dimethylformamide plays a significant role of"two birds(i.e.,solvent and precipitant)with one stone"in the formation of the S-CoCO_(3)/rGO,greatly improving its practical applicability.The purposeful introduction of rGO nanosheets as a two-dimensional flexible conductive network enhances the conductivity and stability of the S-CoCO_(3).It is the structural and compositional merits for LIBs that endow the S-CoCO3/rGO with remarkable lithium-storage performance in terms of enhanced interfacial storage capacity,high-rate reversible capacities(803 mAh·g^(-1)at 2.0 A·g^(-1))and long-duration capacity retention of 82.1%over 2000 consecutive cycles at 2.0 A·g^(-1).More significantly,the simple yet efficient avenue here promises enormous commercial prospect of the S-CoCO_(3)/rGO in next-generation LIBs.
基金Project supported by the National Basic Research Program of China （Grant Nos. 2011CBA00110 and 2011CBA00107） and the National Natural Science Foundation of China.
文摘We studied numerically the temperature dependent extraordinary terahertz transmission through niobium nitride(NbN) film perforated with subwavelength spindle-like apertures. Both the resonant frequency and intensity of extraordinary terahertz transmission peaks can be greatly modified by the transition of NbN film from the normal state to the superconducting state. An enhancement of the(±1, 0) NbN/magnesium oxide(MgO) peak intensity as high as 200% is demonstrated due to the combined contribution of both the superconducting transition and the excitation of localized surface plasmons(LSPs) around the apertures. The extraordinary terahertz transmission through spindle-like hole arrays patterned on the NbN film can pave the way for us to explore novel active tuning devices.
基金Project supported by National Key R&D Program of China(2022YFB3506200)the Science and Technology Major Program of Guangxi(GUIKEAA24206022)+5 种基金National Natural Science Foundation of China(22372107,22402129)Fundamental Research Funds for the Liaoning Universities(LJ212410166052,LJ212410166046)the Ministry of Education's Collaborative Education Project on Industry and Education(230805940033356)Postgraduate Education Reform Project of Liaoning Province(LNYJG2023280,LNYJG2022400)Liaoning Xingliao Talented Youth Top Talent Program(XLYC2203007,XLYC2203138)Liaoning Province International Science and Technology Cooperation Program(2024JH2/102100004)。
文摘Diesel engines are widely used in automobiles,ships,and other fields because of their good economy and power performance;however,the use of diesel engines is often accompanied by the production of the soot particles,which can cause significant harm to the environment and humans;thus,catalytically eliminating soot particles is of great significance.A series of spindle-like CeO_(2)catalysts loaded with different contents of K and Co mixed oxides(K_(x)Co_(y)O_(δ)/CeO_(2))was successfully prepared via hydrothermal and incipient wetness methods.Due to the loading of K and Co mixed oxides on the surface of CeO_(2),the K_(x)Co_(y)O_(δ)/CeO_(2)catalysts have abundant oxygen vacancies,good redox performance,and NO oxidation ability.At the same time,the K_(x)Co_(y)O_(δ)/CeO_(2)catalysts have a special spindle-like morphology that helps the catalyst generate an increased number of active sites and oxygen vacancies;therefore,they have excellent catalytic performance for soot combustion reaction,including activity,stability,and water and sulfur resistance.Among them,the K_(0.05)Co_(0.05)O_(δ)/CeO_(2)catalyst has the highest soot combustion activity,with T_(10),T_(50),and T_(90)values of 287,325,and 349~℃,respectively.Due to the excellent catalytic performance,as well as the easy availability and low cost of the raw materials,the K_(x)Co_(y)O_(δ)/CeO_(2)catalysts have good development prospects in the field of catalytic soot elimination.
基金financially supported by the National Natural Science Foundation of China(Nos.51173185 and 51303179)
文摘Copolymers with super segregated structure of hydrophilic methoxy poly（ethylene glycol） （mPEG） and fluorophilic poly（1H,1H,2H,2H-perfluorodecyl acrylate） （PFA） were prepared. And just because of this super segregated structure which was resulted from the extremely strong incompatibility between the two blocks, several interesting self- assembly behaviors of the copolymers were displayed and studied under different conditions. Transmission electron microscope （TEM） showed that with the increase of PFA in the polymerization system, the incompatibility in this super segregated structure became stronger, and the self-assembly behavior changed from ball-like or rod-like to vesicles, and finally collapsed to sheet-like. The self-assembly behavior changed likewise when the initial concentration increased. And the interesting formation of these barrel-like and spindle-like vesicles was finally studied with different cooling speeds. It＇s finally found that with this super segregation structure, these new self-assembly morphology might be formed due to the extremely strong incompatibility between mPEG and PFA segments.
