Rechargeable aqueous zinc-ion batteries are recently gaining incremental attention because of low cost and material abundance,but their development is plagued by limited choices of cathode materials with satisfactory ...Rechargeable aqueous zinc-ion batteries are recently gaining incremental attention because of low cost and material abundance,but their development is plagued by limited choices of cathode materials with satisfactory cycling performance.The polyoxometalates perform formidable redox stability and able to participate in multi-electron transfer,which was well-suited for energy storage.Herein,a bicomponent polyoxometalate-derivative KNiVO(K_(2)[Ni(H_(2)O)_(6)]_(2)[V_(10)O_(28)]·_(4)H_(2)O polyoxometalates after annealing)is firstly demonstrated as a cathode material for aqueous ZIBs.The layered KV_(3)O_(8)(KVO)In the bi-component material constitutes Zn^(2+) migration and storage channels(K^(+) were substantially replaced by Zn^(2+) in the activation phase),and the three-dimensional NiV_(3)O_(8)(NiVO)part acts as skeleton to stabilize the ion channels,which assist the cell to demonstrate a high-rate capacity and specific energy of229.4 mAh/g and satisfactory cyclability(capacity retention of 99.1%after 4500 cycles at a current density of 4 A/g).These results prove the feasibility of POM as cathode materials precursor and put forward a novel pattern of the Zn^(2+)storage mechanism in the activated-KNiVO clusters,which also provide a new route for selecting or designing high-performance cathode for aqueous ZIBs and other advanced battery systems.展开更多
A bi-component catalyst comprising CuC1 and metallic copper was used in the direct synthesis of me- thylchlorosilane to study the catalytic synergy between the different copper sources. The catalyst exhibited high ac-...A bi-component catalyst comprising CuC1 and metallic copper was used in the direct synthesis of me- thylchlorosilane to study the catalytic synergy between the different copper sources. The catalyst exhibited high ac- tivity and high selectivity of dimethyldichlorosilane （M2） in the stirred bed reactor. The effect of the proportion of CuC1 used was studied and 10%-30% CuC1 gave the best yield of M2. The use of CuC1 decreased the induction pe- riod of reaction, improved the selectivity in the induction stage, and gave a longer stable stage. These results sug- gest that bi-comoonent catalyst has advantazes in the direct synthesis reaction.展开更多
We obtain bi-component Coulomb crystals using laser-cooled ^40Ca^+ ions to sympathetically cool ^9Be^+ ions in a linear Paul trap. The shell structures of the bi-component Coulomb crystals are investigated. The secula...We obtain bi-component Coulomb crystals using laser-cooled ^40Ca^+ ions to sympathetically cool ^9Be^+ ions in a linear Paul trap. The shell structures of the bi-component Coulomb crystals are investigated. The secular motion frequencies of the two different ions are determined and compared with those in the single-component Coulomb crystals. In the radial direction, the resonant motion frequencies of the two ionic species shift toward each other due to the strong motion coupling in the ion trap. In the axial direction, the motion frequency of the laser-cooled ^40Ca^+is impervious to the sympathetically cooled ^9Be^+ ions because the spatially separation of the two different ionic species leads to the weak motion coupling in the axial direction.展开更多
A bi-component alcoholysis agent containing propylene glycol(PG)and ethanolamine(ETA)was used to catalyst the degradation of the waste polyurethane rigid foam.The oligomer polyols obtained through degradation were use...A bi-component alcoholysis agent containing propylene glycol(PG)and ethanolamine(ETA)was used to catalyst the degradation of the waste polyurethane rigid foam.The oligomer polyols obtained through degradation were used as raw materials to produce recycled polyurethane rigid foam composites with lignin as reinforcing filler.The effect of alcoholysis mass ratio on degradation was investigated by analyzing the viscosity,hydroxyl content and chemical structure of the degradation products.The effect of lignin addition on the properties of regenerated polyurethane rigid foam were investigated by analyzing water absorption rate,compressive strength,porosity,thermal stability,thermal conductivity coefficient,morphology and thermal stability of the recycled polyurethane rigid foam.Results show that different mass ration of PG to ETA significantly affects the degradation of waste polyurethane rigid foam.Besides,only with the addition of appropriate amount of lignin,the regenerated polyurethane rigid foam composites can meet the Chinese national standard“rigid polyurethane foam for building thermal insulation”(GB/T21558-2008).At this point,the composite is with good mechanical and thermal prperties,including high compressive strength,excellent thermal insulation performance,complete cell morphology and good thermal stability.展开更多
The synergistic effect of bi-component support catalysts via facile synthesis remains a pivotal challenge in catalysis,particularly under mild conditions.Therefore,this study reports an ultrasonication-plasma strategy...The synergistic effect of bi-component support catalysts via facile synthesis remains a pivotal challenge in catalysis,particularly under mild conditions.Therefore,this study reports an ultrasonication-plasma strategy to produce a PtGaPCoCoO@TiO_(x)site catalyst encapsulated within a high-entropy alloy framework.This approach harnesses instantaneous high-temperature plasma generated using an electrical field and ultrasonication under ambient conditions in H_(2)O.This study also elucidates the origin of the bifunctional effect in high-loading,ultra-stable,and ultra-fine PtGaPCoCoO catalysts,which are coated with a reducible TiO_(x)layer,thereby achieving optimal catalytic activity and hydrogen evolution reaction(HER)performance.PtGaPCo intimacy in PtGaPCoCoO@TiO_(x)is tuned and distributed on the porous titania coating based on strong metal-support interactions by leveraging the instantaneous high-energy input from plasma discharge and ultrasonication under ambient conditions in H_(2)O.PtGaPCoCoO@TiO_(x)exhibits remarkable selectivity and durability in the hydrogenation of 3-nitrophenylacetylene,even after 25 cycles with high conversion rates,significantly outperforming comparative catalysts lacking the ultrasonication plasma treatment and other reported catalysts.Furthermore,the catalyst exhibits exceptional HER activity,demonstrated by an overpotential of 187 mV at a current density of 10 mA cm^(-2)and a Tafel slope of 152 mV dec-1.This enhancement can be attributed to an increased electron density on the Pt surface within the PtGaPCo alloy.These findings highlight the potential of achieving synergistic chemical interactions among active metal sites in stable,industry-applicable catalysts.展开更多
基金supported by the Natural Science Foundation of Hunan Province(No.2020JJ4684)the Fundamental Research Funds for the Central Universities of Central South University(No.2021zzts0522)the Recruitment Program of Global Youth Experts。
文摘Rechargeable aqueous zinc-ion batteries are recently gaining incremental attention because of low cost and material abundance,but their development is plagued by limited choices of cathode materials with satisfactory cycling performance.The polyoxometalates perform formidable redox stability and able to participate in multi-electron transfer,which was well-suited for energy storage.Herein,a bicomponent polyoxometalate-derivative KNiVO(K_(2)[Ni(H_(2)O)_(6)]_(2)[V_(10)O_(28)]·_(4)H_(2)O polyoxometalates after annealing)is firstly demonstrated as a cathode material for aqueous ZIBs.The layered KV_(3)O_(8)(KVO)In the bi-component material constitutes Zn^(2+) migration and storage channels(K^(+) were substantially replaced by Zn^(2+) in the activation phase),and the three-dimensional NiV_(3)O_(8)(NiVO)part acts as skeleton to stabilize the ion channels,which assist the cell to demonstrate a high-rate capacity and specific energy of229.4 mAh/g and satisfactory cyclability(capacity retention of 99.1%after 4500 cycles at a current density of 4 A/g).These results prove the feasibility of POM as cathode materials precursor and put forward a novel pattern of the Zn^(2+)storage mechanism in the activated-KNiVO clusters,which also provide a new route for selecting or designing high-performance cathode for aqueous ZIBs and other advanced battery systems.
文摘A bi-component catalyst comprising CuC1 and metallic copper was used in the direct synthesis of me- thylchlorosilane to study the catalytic synergy between the different copper sources. The catalyst exhibited high ac- tivity and high selectivity of dimethyldichlorosilane （M2） in the stirred bed reactor. The effect of the proportion of CuC1 used was studied and 10%-30% CuC1 gave the best yield of M2. The use of CuC1 decreased the induction pe- riod of reaction, improved the selectivity in the induction stage, and gave a longer stable stage. These results sug- gest that bi-comoonent catalyst has advantazes in the direct synthesis reaction.
基金Supported by the National Natural Science Foundation of China under Grant Nos 91636216,11504410 and 11474317the Strategic Priority Research Program(B) of the Chinese Academy of Sciences under Grant No XDB21020200
文摘We obtain bi-component Coulomb crystals using laser-cooled ^40Ca^+ ions to sympathetically cool ^9Be^+ ions in a linear Paul trap. The shell structures of the bi-component Coulomb crystals are investigated. The secular motion frequencies of the two different ions are determined and compared with those in the single-component Coulomb crystals. In the radial direction, the resonant motion frequencies of the two ionic species shift toward each other due to the strong motion coupling in the ion trap. In the axial direction, the motion frequency of the laser-cooled ^40Ca^+is impervious to the sympathetically cooled ^9Be^+ ions because the spatially separation of the two different ionic species leads to the weak motion coupling in the axial direction.
文摘A bi-component alcoholysis agent containing propylene glycol(PG)and ethanolamine(ETA)was used to catalyst the degradation of the waste polyurethane rigid foam.The oligomer polyols obtained through degradation were used as raw materials to produce recycled polyurethane rigid foam composites with lignin as reinforcing filler.The effect of alcoholysis mass ratio on degradation was investigated by analyzing the viscosity,hydroxyl content and chemical structure of the degradation products.The effect of lignin addition on the properties of regenerated polyurethane rigid foam were investigated by analyzing water absorption rate,compressive strength,porosity,thermal stability,thermal conductivity coefficient,morphology and thermal stability of the recycled polyurethane rigid foam.Results show that different mass ration of PG to ETA significantly affects the degradation of waste polyurethane rigid foam.Besides,only with the addition of appropriate amount of lignin,the regenerated polyurethane rigid foam composites can meet the Chinese national standard“rigid polyurethane foam for building thermal insulation”(GB/T21558-2008).At this point,the composite is with good mechanical and thermal prperties,including high compressive strength,excellent thermal insulation performance,complete cell morphology and good thermal stability.
基金supported by two Mid-Level Researcher National Projects of the National Research Foundation(NRF)funded by the Ministry of Science and ICT,Republic of Korea(NRF-2022R1A2C1004392).
文摘The synergistic effect of bi-component support catalysts via facile synthesis remains a pivotal challenge in catalysis,particularly under mild conditions.Therefore,this study reports an ultrasonication-plasma strategy to produce a PtGaPCoCoO@TiO_(x)site catalyst encapsulated within a high-entropy alloy framework.This approach harnesses instantaneous high-temperature plasma generated using an electrical field and ultrasonication under ambient conditions in H_(2)O.This study also elucidates the origin of the bifunctional effect in high-loading,ultra-stable,and ultra-fine PtGaPCoCoO catalysts,which are coated with a reducible TiO_(x)layer,thereby achieving optimal catalytic activity and hydrogen evolution reaction(HER)performance.PtGaPCo intimacy in PtGaPCoCoO@TiO_(x)is tuned and distributed on the porous titania coating based on strong metal-support interactions by leveraging the instantaneous high-energy input from plasma discharge and ultrasonication under ambient conditions in H_(2)O.PtGaPCoCoO@TiO_(x)exhibits remarkable selectivity and durability in the hydrogenation of 3-nitrophenylacetylene,even after 25 cycles with high conversion rates,significantly outperforming comparative catalysts lacking the ultrasonication plasma treatment and other reported catalysts.Furthermore,the catalyst exhibits exceptional HER activity,demonstrated by an overpotential of 187 mV at a current density of 10 mA cm^(-2)and a Tafel slope of 152 mV dec-1.This enhancement can be attributed to an increased electron density on the Pt surface within the PtGaPCo alloy.These findings highlight the potential of achieving synergistic chemical interactions among active metal sites in stable,industry-applicable catalysts.
