The efficient separation of deuterium from hydrogen remains a significant challenge due to the limitations of conventional techniques,such as cryogenic distillation and the Girdler-sulfide process combined with electr...The efficient separation of deuterium from hydrogen remains a significant challenge due to the limitations of conventional techniques,such as cryogenic distillation and the Girdler-sulfide process combined with electrolysis,which are char-acterized by substantial energy demands and relatively low separation coefficients.In contrast,the quantum sieving effect,based on porous materials,offers a promising approach to overcoming these challenges.This study presents a novel application of strong adsorption sites(μ3-OH group)within the nanoporous metal-organic framework of UiO-66 for hydrogen isotope separation.By incorporating diverse organic functional groups into UiO-66,we successfully synthesized four derivative materials:UiO-66-NH_(2),UiO-66-CH_(3),UiO-66-NO_(2),and UiO-66-Ph.Experimental data reveal that the introduction of these functional groups modulated the material’s pore size and channel polarity,significantly impacting its adsorption and separation performance for hydrogen isotopes.Notably,UiO-66-NH_(2),with the smallest pore size and highest channel polarity,exhibited superior hydrogen isotope adsorption capacity and selectivity,highlighting its potential as an effective adsorbent for isotope separation.展开更多
Morphological control is an effective approach to enhance the rate performance of nanostructured electrode materials,offering a promising solution for alleviating energy concerns.We have utilized a seed-mediated growt...Morphological control is an effective approach to enhance the rate performance of nanostructured electrode materials,offering a promising solution for alleviating energy concerns.We have utilized a seed-mediated growth method to synthesize hexagonal djurleite(Cu_(1.94)S)nanoplates and nanoflowers under N_(2) and air,respectively.The influence of the morphology on the ion interaction has been investigated in the storage process through half-cell electrochemical energy storage.Cu_(1.94)S nanoplates performed a higher specific capacity of 193 mAh g^(−1) at a high rate of 8 A g^(−1) than nanoflowers and showed excellent cycle stability over 4,000 cycles with capacity retention of 80.8%.The relationship between morphology and electrochemical performance was explored through further electrochemical characterization.It is found that the stacking of hexagonal surfaces of nanoplates increases the contact area of the electrode material and reduced resistance,leading to faster ion migration and a more complete redox process,ultimately contributing to a higher specific capacity.Our study has enhanced the understanding of structure-property relationships for electrode material,providing an insightful approach for the preparation of electrode materials suitable for ultrafast charge and discharge.展开更多
基金supported by National Nature Science Foundation of China(22275191,22275186)the Self-deployment deployment Project Research Program of Haixi Institutes,Chinese Academy of Sciences(CXZX-2022-GH01,CXZX-2022-JQ11)the Nature Science Foundation of Fujian Province(No.2022I0037).
文摘The efficient separation of deuterium from hydrogen remains a significant challenge due to the limitations of conventional techniques,such as cryogenic distillation and the Girdler-sulfide process combined with electrolysis,which are char-acterized by substantial energy demands and relatively low separation coefficients.In contrast,the quantum sieving effect,based on porous materials,offers a promising approach to overcoming these challenges.This study presents a novel application of strong adsorption sites(μ3-OH group)within the nanoporous metal-organic framework of UiO-66 for hydrogen isotope separation.By incorporating diverse organic functional groups into UiO-66,we successfully synthesized four derivative materials:UiO-66-NH_(2),UiO-66-CH_(3),UiO-66-NO_(2),and UiO-66-Ph.Experimental data reveal that the introduction of these functional groups modulated the material’s pore size and channel polarity,significantly impacting its adsorption and separation performance for hydrogen isotopes.Notably,UiO-66-NH_(2),with the smallest pore size and highest channel polarity,exhibited superior hydrogen isotope adsorption capacity and selectivity,highlighting its potential as an effective adsorbent for isotope separation.
基金support from the National Natural Science Foundation of China(22175039 and 22088101)the National Key Research and Development Program of China(2023YFA1507603)the Key Basic Research Program of Science and Technology Commission of Shanghai Municipality(22JC1410200).
文摘Morphological control is an effective approach to enhance the rate performance of nanostructured electrode materials,offering a promising solution for alleviating energy concerns.We have utilized a seed-mediated growth method to synthesize hexagonal djurleite(Cu_(1.94)S)nanoplates and nanoflowers under N_(2) and air,respectively.The influence of the morphology on the ion interaction has been investigated in the storage process through half-cell electrochemical energy storage.Cu_(1.94)S nanoplates performed a higher specific capacity of 193 mAh g^(−1) at a high rate of 8 A g^(−1) than nanoflowers and showed excellent cycle stability over 4,000 cycles with capacity retention of 80.8%.The relationship between morphology and electrochemical performance was explored through further electrochemical characterization.It is found that the stacking of hexagonal surfaces of nanoplates increases the contact area of the electrode material and reduced resistance,leading to faster ion migration and a more complete redox process,ultimately contributing to a higher specific capacity.Our study has enhanced the understanding of structure-property relationships for electrode material,providing an insightful approach for the preparation of electrode materials suitable for ultrafast charge and discharge.
