Hydrogen energy has emerged as a pivotal solution to address the global energy crisis and pave the way for a cleaner,low-carbon,secure,and efficient modern energy system.A key imperative in the utilization of hydrogen...Hydrogen energy has emerged as a pivotal solution to address the global energy crisis and pave the way for a cleaner,low-carbon,secure,and efficient modern energy system.A key imperative in the utilization of hydrogen energy lies in the development of high-performance hydrogen storage materials.Magnesium-based hydrogen storage materials exhibit remarkable advantages,including high hydrogen storage density,cost-effectiveness,and abundant magnesium resources,making them highly promising for the hydrogen energy sector.Nonetheless,practical applications of magnesium hydride for hydrogen storage face significant challenges,primarily due to their slow kinetics and stable thermodynamic properties.Herein,we briefly summarize the thermodynamic and kinetic properties of MgH2,encompassing strategies such as alloying,nanoscaling,catalyst doping,and composite system construction to enhance its hydrogen storage performance.Notably,nanoscaling and catalyst doping have emerged as more effective modification strategies.The discussion focuses on the thermodynamic changes induced by nanoscaling and the kinetic enhancements resulting from catalyst doping.Particular emphasis lies in the synergistic improvement strategy of incorporating nanocatalysts with confinement materials,and we revisit typical works on the multi-strategy optimization of MgH2.In conclusion,we conduct an analysis of outstanding challenges and issues,followed by presenting future research and development prospects for MgH2 as hydrogen storage materials.展开更多
High entropy alloy(HEA)based materials have been extensively investigated as viable catalysts in hydrogen storage for their unique properties.Herein,we demonstrate a relatively mild synthesis strategy for constructing...High entropy alloy(HEA)based materials have been extensively investigated as viable catalysts in hydrogen storage for their unique properties.Herein,we demonstrate a relatively mild synthesis strategy for constructing carbon-supported by NiCoFeCuMg HEA(NiCoFe-CuMg@C)nanocatalysts by utilizing polymetallic metal-organic frameworks(MOFs)as precursors.The incorporation of prepared catalysts into MgH_(2) greatly improved the hydrogen storage performance:the MgH_(2)+NiCoFeCuMg@C composite can rapidly desorb 6.01 wt%H2 at 325℃,and the initial dehydrogenation temperature decreased to 167.2℃,nearly 163.8℃ lower than that of the pure MgH_(2).Besides,the composite exhibits a fairly stable reversible capacity with 97%capacity retention after 20 cycles.Most importantly,ex-situ structural characterization reveals that the synergistic effects of the“hydrogen pump”role of Mg_(2)Ni(Cu)/Mg_(2)Ni(Cu)H_(4) and“hydrogen gateway”role of Co3Fe7,as well as the excellent dispersion function of carbon material,contribute to the outstanding hydrogen storage properties of the MgH_(2)+NiCoFeCuMg@C composite.This study provides valuable insights into the performance improvement of carbon-supported HEA catalysts in modification of MgH_(2).展开更多
基金supported by National Key Research and Development Program of China(2021YFB4000604)National Natural Science Foundation of China(52271220)111 Project(B12015)and the Fundamental Research Funds for the Central Universities.
文摘Hydrogen energy has emerged as a pivotal solution to address the global energy crisis and pave the way for a cleaner,low-carbon,secure,and efficient modern energy system.A key imperative in the utilization of hydrogen energy lies in the development of high-performance hydrogen storage materials.Magnesium-based hydrogen storage materials exhibit remarkable advantages,including high hydrogen storage density,cost-effectiveness,and abundant magnesium resources,making them highly promising for the hydrogen energy sector.Nonetheless,practical applications of magnesium hydride for hydrogen storage face significant challenges,primarily due to their slow kinetics and stable thermodynamic properties.Herein,we briefly summarize the thermodynamic and kinetic properties of MgH2,encompassing strategies such as alloying,nanoscaling,catalyst doping,and composite system construction to enhance its hydrogen storage performance.Notably,nanoscaling and catalyst doping have emerged as more effective modification strategies.The discussion focuses on the thermodynamic changes induced by nanoscaling and the kinetic enhancements resulting from catalyst doping.Particular emphasis lies in the synergistic improvement strategy of incorporating nanocatalysts with confinement materials,and we revisit typical works on the multi-strategy optimization of MgH2.In conclusion,we conduct an analysis of outstanding challenges and issues,followed by presenting future research and development prospects for MgH2 as hydrogen storage materials.
基金supported by National Key Research and Development Program of China(2021YFB4000604)National Natural Science Foundation of China(52271220)+1 种基金111 Project(B12015)the Fundamental Research Funds for the Central Universities.
文摘High entropy alloy(HEA)based materials have been extensively investigated as viable catalysts in hydrogen storage for their unique properties.Herein,we demonstrate a relatively mild synthesis strategy for constructing carbon-supported by NiCoFeCuMg HEA(NiCoFe-CuMg@C)nanocatalysts by utilizing polymetallic metal-organic frameworks(MOFs)as precursors.The incorporation of prepared catalysts into MgH_(2) greatly improved the hydrogen storage performance:the MgH_(2)+NiCoFeCuMg@C composite can rapidly desorb 6.01 wt%H2 at 325℃,and the initial dehydrogenation temperature decreased to 167.2℃,nearly 163.8℃ lower than that of the pure MgH_(2).Besides,the composite exhibits a fairly stable reversible capacity with 97%capacity retention after 20 cycles.Most importantly,ex-situ structural characterization reveals that the synergistic effects of the“hydrogen pump”role of Mg_(2)Ni(Cu)/Mg_(2)Ni(Cu)H_(4) and“hydrogen gateway”role of Co3Fe7,as well as the excellent dispersion function of carbon material,contribute to the outstanding hydrogen storage properties of the MgH_(2)+NiCoFeCuMg@C composite.This study provides valuable insights into the performance improvement of carbon-supported HEA catalysts in modification of MgH_(2).
