Study On The Preparation And Its Hydrogen Production Performance Of Hydrolyzed Aluminum Alloy Materials

As a green,pollution-free and renewable secondary energy source,hydrogen energy has received the attention and recognition of researchers at home and abroad.However,there are still certain problems in the widespread application of hydrogen energy.For example,the current technology and method of hydrogen production have some problems such as insufficient purity,high cost,low hydrogen production efficiency and new environmental pollution in the process of hydrogen production.In addition,due to the low density,inflammable and explosive characteristics of hydrogen,there are some technical problems in the process of storage and transportation of hydrogen.Therefore,the research and development of an in-situ hydrogen production technology with low cost,high hydrogen production efficiency,safe and reliable hydrogen production process and instant hydrogen production is of great significance for large-scale promotion and application of hydrogen energy.In this paper,a series of Aluminum alloys with different composition were prepared by traditional melt casting method.The effects of composition,hydrolysis temperature and Refiner?AlTi₅B?on hydrogen production by hydrolysis of Aluminum alloy were studied and analyzed,and the mechanism of hydrolysis reaction was analyzed.In order to study the activation mechanism of Aluminum alloy,the microstructure,phase composition,phase transformation process,element distribution and valence state of Aluminum alloy were studied and analyzed in detail by means of comprehensive analysis and characterization methods such as X-ray Diffractometer?XRD?,Scanning Electron Microscope?SEM?,Differential Scanning Calorimetry?DSC?and Energy Dispersive Spectrometer?EDS?.The main research contents and conclusions of this paper are as follows:?1?Al-Ga-Sn,Al-Ga-In and Al-Ga-In-Sn system Aluminum alloy ingots with different chemical compositions were prepared by melt casting method,and the performance of hydrolysis hydrogen production was tested.The results show that low-melting-point metals Ga,In,and Sn can form low-melting-point phase eutectic alloys and micro-galvanic cells with Al in Aluminum alloy ingots.The melting point of the low-melting phase eutectic alloy and the open-circuit voltage of the Aluminum alloy are closely related to the hydrogen production performance of the Aluminum alloy.The lower the melting point of the low-melting phase eutectic alloy and the lower the open-circuit voltage of the Aluminum alloy,the better the hydrolysis and hydrogen production performance of the Aluminum alloy.In addition,the hydrogen production performance of Aluminum alloys is also closely related to the temperature of the reaction water.The hydrogen production performance of Aluminum alloys increases as the temperature of the reaction water increases.?2?In order to further improve the hydrogen production rate of Aluminum alloy,the grain of Aluminum alloy is refined by using the Refiner?AlTi₅B?.It is found that the hydrogen production rate of Aluminum alloy is obviously increased and the reaction time is greatly shortened by adding a proper amount of AlTi₅B in the melting process.After the addition of AlTi₅B,the grains of Aluminum alloy changed from columnar grains to equiaxed grains,and the size of Aluminum grains decreased from 100?m to30?m.The results of Differential Scanning Calorimetry?DSC?show that the low melting point phase in Aluminum alloy changes into eutectic phase with lower melting point after adding proper amount of AlTi₅B.The existence of low melting point phase can not only protect the Aluminum grain from oxidation,but also provide a reaction channel for the reaction between Aluminum atom and water,and promote the hydrolysis reaction between Aluminum atom and water.The electrochemical test results show that the open circuit voltage of Aluminum alloy decreases and the hydrolysis reaction of Aluminum alloy is promoted by adding AlTi₅B.In addition,after adding AlTi₅B,the Activation energy?Ea?of Aluminum alloy decreased,and the rate of hydrogen production by hydrolysis of Aluminum alloy increased.For example,at 20?,1 g Al-3Ga-3In-3Sn Aluminum alloy produces 980 ml hydrogen in 280 min,and the hydrogen production conversion rate is 79.3%;1 g Al-3Ga-3In-3Sn-0.1%AlTi₅B Aluminum alloy produces 1200 ml hydrogen in 230 min,and the hydrogen production conversion rate is 97.1%.The hydrogen production rate of Aluminum alloy is also closely related to the temperature of initial reaction water.The higher the temperature,the faster the hydrogen production rate of Aluminum alloy.For example,at 20?,1 g Al-3Ga-3In-3Sn Aluminum alloy produces 980 ml hydrogen for 280 min,and the hydrogen production conversion rate is 79.3%;at 60?,1 g Al-3Ga-3In-3Sn Aluminum alloy produces 1150 ml hydrogen for 50 min,and the hydrogen production conversion rate is 93.06%.