Study On The Effect Of Element Addition On Hydrogenation Of Al Hydrolysis

With the aggravation of environmental pollution and energy crisis,the development and use of hydrogen energy have been promoted.Low-cost and high-efficient hydrogen storage technology is an important research topic at present.In theory,aluminum is active in nature and cheap in price.It can react with water to produce a large amount of hydrogen,so it has become an important material for hydrogen production.In fact,the surface of aluminum is easy to form oxide film,which hinders the reaction of aluminum with water at room temperature.Therefore,the key to the production of hydrogen from aluminum water is to break down the inert oxide film and improve the activity of aluminum.In this paper,Al-Ni-Sn-In alloy,Al-Sn-SiC alloy and Al-Co alloy were prepared by alloying method.The effects of alloy composition,hydrolysis temperature and alkalinity on the activity and hydrolysis rate of Al-base alloy were studied.In addition,the phase structure,corrosion surface morphology and element distribution of the alloy were analyzed by means of XRD and SEM,and electrochemical corrosion performance was studied by electrochemical workstation.The hydrolysis mechanism of Al-base alloy was further clarified.The Al-base alloy with other materials can form new phase,increase the defects in the matrix,obviously improve the activity of the alloy,and the conversion rate of the alloy is above 90%,and the hydrogen production amount per unit mass is close to the theoretical value.The electrode potential of Al-base alloy becomes negative,indicating that the material is easy to corrode.Among them,the hydrolysis rate of Al-base alloy was obviously increased with the addition of low melting point alloy and non-metallic material.The average hydrolysis rate of Al-4wt.%Sn-1wt.%SiC is as high as 18.92ml/min·g in 15 wt.% KOH solution at 25?,but the hydrolysis effect of Al-base alloy with high melting point cobalt is much worse under the same conditions.The hydrolysis of aluminum-based materials is an exothermic reaction.The increase of temperature improves the kinetic properties and the activity of aluminum hydrolysis.Increasing the reaction temperature is helpful to increase the hydrogen production rate of aluminum hydrolysis reaction and reach the maximum hydrolysis value in a short time.The increase of temperature generally shortens the hydrolysis time.Increasing alkalinity can also increase the hydrolysis rate,but the effect of temperature is more obvious.The Al-base alloy studied in this paper can react with water in 15 wt.%KOH solution at 25? to produce hydrogen,which can be used as hydrogen source for fuel cell.It provides a theory evidence for improving the activity of Al-based materials and offer the possibility for the realization of On-board hydrogen production technology.