The effect of various cations/anions for MgH2 hydrolysis reaction
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第14期
论文作者：Chongyang Yuan Wei Chen Zunxian Yang Zhenguo Huang Xuebin Yu
摘 要：MgH2 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 MgH2 will hinder its further hydrolysis reaction,leading to sluggish reaction kinetics and low H2 yield.In this paper,we explore the improvement of different anions and cations in solutions for the hydrolysis of MgH2.It is found that the cations in the solution promote the reaction rate of MgH2 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 Fe2（SO4）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 MgCl2+0.05 M MgSO4 solution,the water utilization rate attains the optimum value of 51.3%,much higher than that of the single MgCl2 or MgSO4 solutions.These findings are of great significance for the application of MgH2 hydrolysis as hydrogen generation.
Chongyang Yuan1，Wei Chen1，Zunxian Yang2，Zhenguo Huang3，Xuebin Yu1
1. Department of Materials Science, Fudan University2. National and Local United Engineering Laboratory of Flat Panel Display Technology, Fuzhou University3. School of Civil & Environmental Engineering, University of Technology Sydney
摘 要：MgH2 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 MgH2 will hinder its further hydrolysis reaction,leading to sluggish reaction kinetics and low H2 yield.In this paper,we explore the improvement of different anions and cations in solutions for the hydrolysis of MgH2.It is found that the cations in the solution promote the reaction rate of MgH2 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 Fe2（SO4）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 MgCl2+0.05 M MgSO4 solution,the water utilization rate attains the optimum value of 51.3%,much higher than that of the single MgCl2 or MgSO4 solutions.These findings are of great significance for the application of MgH2 hydrolysis as hydrogen generation.
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