摘要
The developing trend of vehicle is electrical vehicle in future, and fuel cell will become the one of the main batteries of electrical vehicle because of its the prominent properties. The one of current obstacle for fuel cell in popularization and applications is lacking of excellent performance hydrogen storage materials and advanced technologies of preparing nanoparticles for hydrogen storage materials. The principles, typical classifications and characteristics of chemically and physically preparing nanoparticles for hydrogen storage materials are briefly introduced. And it predicts that physical method is going to be the major developing direction for nanoparticles for hydrogen storage material fabrication. The principle, the system composition ＆ characteristics of method by means of combining ball milling with aerosol generation preparing nanoparticles for hydrogen storage materials are expounded. The ball milling process for hydrogen storage material is needed to conduct effective cooling process, and the lower cooling temperature has better milling results. The cooling media for ball milling include room temperature water, ice water, pure ethanol with dry ice and liquid nitrogen. The proper level of vacuum in canister is significant for injecting aerosol particles during the ball milling. In order to maximize the friction force, it is better to design multi-level stirring rod and the profile of stirring rod with large contact area, therefor stirring rod with cylinder has less grinding effect than with ring profile. The more stirring rod with more layers will obtain higher stirring efficiency. The distance between each layer of branches is 2.5 times larger than diameter of the ball. The simulation results show that the average speed has 120% increases from 400 rpm to 800 rpm. Based on the kinetic energy equation, it is obtained that there is 350% increase in energy from 400 r/min to 800 r/min. The higher stirring speed will generate the finer material. And the discussion of this article provides a favorable basis of preparing nanoparticles for hydrogen storage materials in fuel cell vehicle.
The developing trend of vehicle is electrical vehicle in future, and fuel cell will become the one of the main batteries of electrical vehicle because of its the prominent properties. The one of current obstacle for fuel cell in popularization and applications is lacking of excellent performance hydrogen storage materials and advanced technologies of preparing nanoparticles for hydrogen storage materials. The principles, typical classifications and characteristics of chemically and physically preparing nanoparticles for hydrogen storage materials are briefly introduced. And it predicts that physical method is going to be the major developing direction for nanoparticles for hydrogen storage material fabrication. The principle, the system composition ＆ characteristics of method by means of combining ball milling with aerosol generation preparing nanoparticles for hydrogen storage materials are expounded. The ball milling process for hydrogen storage material is needed to conduct effective cooling process, and the lower cooling temperature has better milling results. The cooling media for ball milling include room temperature water, ice water, pure ethanol with dry ice and liquid nitrogen. The proper level of vacuum in canister is significant for injecting aerosol particles during the ball milling. In order to maximize the friction force, it is better to design multi-level stirring rod and the profile of stirring rod with large contact area, therefor stirring rod with cylinder has less grinding effect than with ring profile. The more stirring rod with more layers will obtain higher stirring efficiency. The distance between each layer of branches is 2.5 times larger than diameter of the ball. The simulation results show that the average speed has 120% increases from 400 rpm to 800 rpm. Based on the kinetic energy equation, it is obtained that there is 350% increase in energy from 400 r/min to 800 r/min. The higher stirring speed will generate the finer material. And the discussion of this article provides a favorable basis of preparing nanoparticles for hydrogen storage materials in fuel cell vehicle.
基金
supported by National Science Foundation of USA(Grant No.CMMI-1261782:Scalable Manufacturing of Novel Hydrogen Storage Materials with Control at Nanometer Length Scales)
