Zinc-iodine batteries have received significant attention due to their high theoretical capacity and environmental friendliness,but their performance is restricted by the growth of zinc dendrites,the hydrogen evolutio...Zinc-iodine batteries have received significant attention due to their high theoretical capacity and environmental friendliness,but their performance is restricted by the growth of zinc dendrites,the hydrogen evolution reaction,and the shuttling effect of polyiodide ions.In this study,an amidoximefunctionalized hydrogel electrolyte,created by amidoximated porous polymer of intrinsic microporosity(AO-PIM-1)and sodium alginate(Alg),is designed to address the aforementioned problems through synergistically optimizing the interfaces of the zinc anode and iodine cathode.The rigid microporous framework and amidoxime groups of AO-PIM-1 can repel polyiodides and inhibit their shuttle effect.Meanwhile,the polyanionic properties of Alg guide the uniform deposition of Zn^(2+)along the(002)crystal plane through the“egg-box”structure,thus suppressing the formation of dendrites.The AO-PIM-1/Alg electrolyte has a high ionic conductivity(18.6 mS cm^(-1)).The assembled symmetric battery can achieve highly reversible dendrite-free zinc plating/stripping(stably cycling for 2550 h at 1 mA cm^(-2)).The Zn-I_(2) full battery with the AO-PIM-1/Alg electrolyte has a long lifespan of 8700 cycles at 0.5 A g^(-1).The working mechanism of the electrolyte was elucidated through density functional theoretical calculations and molecular dynamics simulations.This study provides a new strategy for the hydrogel electrolyte of ZnI_(2) batteries.展开更多
Herein,a dendritic fibrous nanosilica(DFNS)-based adsorbent was constructed through bio-inspired bifunctional stimulation as a rapid and efficient trap for uranium(VI).Amino-amidoxime bifunctional polyacrylonitrile(AO...Herein,a dendritic fibrous nanosilica(DFNS)-based adsorbent was constructed through bio-inspired bifunctional stimulation as a rapid and efficient trap for uranium(VI).Amino-amidoxime bifunctional polyacrylonitrile(AOPNI-NH_(2))firmly adhered to the DFNS substrate through the polymerization of musselinspired dopamine(DA)with a large amount of amine and carbonyl groups.Meanwhile,the amine group of the introduced AOPNI-NH_(2)not only suppressed the ring-closing reaction of amidoxime groups to increase the active sites,but also improved their adsorption rate.The adsorption amount of U(VI)on asprepared DFNS/pDA/AOPNI-NH_(2)reached q_(m)=678 mg g^(-1),which represented a 118%increase compared with the original DFNS under the same conditions.Finally,the adsorption capacity demonstrated the potential for the application of this adsorbent in a seawater environment.展开更多
Photocatalytic uranium reduction has been proposed as an effective method for treating nuclear wastewater due to its advantages of cleanliness,energy efficiency,and convenience in application.In this study,a Z-scheme ...Photocatalytic uranium reduction has been proposed as an effective method for treating nuclear wastewater due to its advantages of cleanliness,energy efficiency,and convenience in application.In this study,a Z-scheme heterojunction,ZnCdS-P_(2)W_(12)Fe_(9)AO,was designed and synthesized for achieving efficient uranium reduction via an adsorption–photoreduction synergistic strategy.DFT calculation results demonstrated that polyoxometalates modified with amidoxime groups exhibited exceptional uranium adsorption performance.The construction of the Z-scheme heterojunction enhanced visible light absorption,facilitated electron transfer,and promoted the separation of photogenerated electrons and holes.Finally,ZnCdS-P_(2)W_(12)Fe_(9)AO achieved a uranium removal rate of 97.7%(610.6 mg g^(−1) under light irradiation)without the addition of any sacrificial agent.Meanwhile,ZnCdS-P_(2)W_(12)Fe_(9)AO maintained good stability and reusability.This study offers new insights and perspectives for advancing research on photocatalytic uranium reduction.展开更多
基金partially supported by the National Natural Science Foundation of China(22475035 and 22071021)the Natural Science Foundation of Jilin Province(20240101170JC)。
文摘Zinc-iodine batteries have received significant attention due to their high theoretical capacity and environmental friendliness,but their performance is restricted by the growth of zinc dendrites,the hydrogen evolution reaction,and the shuttling effect of polyiodide ions.In this study,an amidoximefunctionalized hydrogel electrolyte,created by amidoximated porous polymer of intrinsic microporosity(AO-PIM-1)and sodium alginate(Alg),is designed to address the aforementioned problems through synergistically optimizing the interfaces of the zinc anode and iodine cathode.The rigid microporous framework and amidoxime groups of AO-PIM-1 can repel polyiodides and inhibit their shuttle effect.Meanwhile,the polyanionic properties of Alg guide the uniform deposition of Zn^(2+)along the(002)crystal plane through the“egg-box”structure,thus suppressing the formation of dendrites.The AO-PIM-1/Alg electrolyte has a high ionic conductivity(18.6 mS cm^(-1)).The assembled symmetric battery can achieve highly reversible dendrite-free zinc plating/stripping(stably cycling for 2550 h at 1 mA cm^(-2)).The Zn-I_(2) full battery with the AO-PIM-1/Alg electrolyte has a long lifespan of 8700 cycles at 0.5 A g^(-1).The working mechanism of the electrolyte was elucidated through density functional theoretical calculations and molecular dynamics simulations.This study provides a new strategy for the hydrogel electrolyte of ZnI_(2) batteries.
基金National Natural Science Foundation of China[NSFC 51872057]Application Technology Research and Development Plan of Heilongjiang Province[GX16A009]+1 种基金Fundamental Research Funds of the Central University[HEUCFZ]Natural Science Foundation of Heilongjiang Province[QC2018010]。
文摘Herein,a dendritic fibrous nanosilica(DFNS)-based adsorbent was constructed through bio-inspired bifunctional stimulation as a rapid and efficient trap for uranium(VI).Amino-amidoxime bifunctional polyacrylonitrile(AOPNI-NH_(2))firmly adhered to the DFNS substrate through the polymerization of musselinspired dopamine(DA)with a large amount of amine and carbonyl groups.Meanwhile,the amine group of the introduced AOPNI-NH_(2)not only suppressed the ring-closing reaction of amidoxime groups to increase the active sites,but also improved their adsorption rate.The adsorption amount of U(VI)on asprepared DFNS/pDA/AOPNI-NH_(2)reached q_(m)=678 mg g^(-1),which represented a 118%increase compared with the original DFNS under the same conditions.Finally,the adsorption capacity demonstrated the potential for the application of this adsorbent in a seawater environment.
基金supported by the Natural Science Foundation of China(Grant No.22071018)the Natural Science Foundation of Jilin Province(No.20220101069JC).
文摘Photocatalytic uranium reduction has been proposed as an effective method for treating nuclear wastewater due to its advantages of cleanliness,energy efficiency,and convenience in application.In this study,a Z-scheme heterojunction,ZnCdS-P_(2)W_(12)Fe_(9)AO,was designed and synthesized for achieving efficient uranium reduction via an adsorption–photoreduction synergistic strategy.DFT calculation results demonstrated that polyoxometalates modified with amidoxime groups exhibited exceptional uranium adsorption performance.The construction of the Z-scheme heterojunction enhanced visible light absorption,facilitated electron transfer,and promoted the separation of photogenerated electrons and holes.Finally,ZnCdS-P_(2)W_(12)Fe_(9)AO achieved a uranium removal rate of 97.7%(610.6 mg g^(−1) under light irradiation)without the addition of any sacrificial agent.Meanwhile,ZnCdS-P_(2)W_(12)Fe_(9)AO maintained good stability and reusability.This study offers new insights and perspectives for advancing research on photocatalytic uranium reduction.
