Aluminum-ion batteries (AIBs) are attracting great attentions recently because of the high volumetric capacity,natural abundance of Al and operational safety.Using metallic A1 as anode,the development of suitable cath...Aluminum-ion batteries (AIBs) are attracting great attentions recently because of the high volumetric capacity,natural abundance of Al and operational safety.Using metallic A1 as anode,the development of suitable cathode materials is a key issue to build an advanced AIBs system [1,2].Up to now,various materials have been studied as cathode materials for AIBs,including graphite [3,4],metal oxides [5-7],and metal sulfides [8,9].However,few of them can meet the application requirements,and the theoretical understanding of their electrochemical mechanism is limited.展开更多
MgH_(2) is regarded as a potential hydrolysis material for the hydrogen generation due to its high theoretical hydrogen yield,abundant source on earth and environmentally friendly hydrolysates.However,the quickly form...MgH_(2) is regarded as a potential hydrolysis material for the hydrogen generation due to its high theoretical hydrogen yield,abundant source on earth and environmentally friendly hydrolysates.However,the quickly formed passive magnesium hydroxide layer on the surface of MgH_(2) will hinder its further hydrolysis reaction,leading to sluggish reaction kinetics and low H_(2) yield.In this paper,we explore the improvement of different anions and cations in solutions for the hydrolysis of MgH_(2).It is found that the cations in the solution promote the reaction rate of MgH_(2) hydrolysis through the hydrolysate-induced growth effect,among which the fastest hydrogen yield can get 1664 m L/g within a few minutes in the Fe_(2)(SO_(4))_(3) solution.As for the anions,it enables different microstructures of the Mg(OH)_(2) hydrolysate which give rise to enhanced water utilization.Specially,for the mixed 0.5 M MgCl_(2)+0.05 M MgSO_(4) solution,the water utilization rate attains the optimum value of 51.3%,much higher than that of the single MgCl_(2) or MgSO_(4) solutions.These findings are of great significance for the application of MgH_(2) hydrolysis as hydrogen generation.展开更多
基金partially supported by the National Key Research and Development Program of China(2017YFA0204600)the National Science Fund for Distinguished Young Scholars(51625102)+2 种基金the National Natural Science Foundation of China(61574039,51971065)the Innovation Program of Shanghai Municipal Education Commission(2019–01–07–00–07-E00028)the Science and Technology Commission of Shanghai Municipality(17XD1400700)。
文摘Aluminum-ion batteries (AIBs) are attracting great attentions recently because of the high volumetric capacity,natural abundance of Al and operational safety.Using metallic A1 as anode,the development of suitable cathode materials is a key issue to build an advanced AIBs system [1,2].Up to now,various materials have been studied as cathode materials for AIBs,including graphite [3,4],metal oxides [5-7],and metal sulfides [8,9].However,few of them can meet the application requirements,and the theoretical understanding of their electrochemical mechanism is limited.
基金supported by the National Key Research and Development Program of China(2017YFA0204600)the National Science Fund for Distinguished Young Scholars(51625102)+2 种基金the National Natural Science Foundation of China(51971065)the Innovation Program of Shanghai Municipal Education Commission(2019–01–07–00–07-E00028)the financial support from ARC(DP170101773)。
文摘MgH_(2) is regarded as a potential hydrolysis material for the hydrogen generation due to its high theoretical hydrogen yield,abundant source on earth and environmentally friendly hydrolysates.However,the quickly formed passive magnesium hydroxide layer on the surface of MgH_(2) will hinder its further hydrolysis reaction,leading to sluggish reaction kinetics and low H_(2) yield.In this paper,we explore the improvement of different anions and cations in solutions for the hydrolysis of MgH_(2).It is found that the cations in the solution promote the reaction rate of MgH_(2) hydrolysis through the hydrolysate-induced growth effect,among which the fastest hydrogen yield can get 1664 m L/g within a few minutes in the Fe_(2)(SO_(4))_(3) solution.As for the anions,it enables different microstructures of the Mg(OH)_(2) hydrolysate which give rise to enhanced water utilization.Specially,for the mixed 0.5 M MgCl_(2)+0.05 M MgSO_(4) solution,the water utilization rate attains the optimum value of 51.3%,much higher than that of the single MgCl_(2) or MgSO_(4) solutions.These findings are of great significance for the application of MgH_(2) hydrolysis as hydrogen generation.
