The Research Of Tife-based Hydrogen Storage Alloys And Tank For Fuel Cell

Based on the research of hydrogen storage system, which will be applied in the field of energy supply system for low power PEMFC . Compared to petroleum reforming technology, pure hydrogen supply system has the advantage of facility and so on. In this paper, TiFe0.8Mn0.2 were the basic hydrogen storage alloy as the main medium in hydrogen storage tank which will be used in the PCV. To improve the activation and synthesize storage characteristic of the TiFe alloy, Multi-component alloying was adopted. By that method, this paper studied the effects of alloy element (Ni, Co, Cr, La, V, Zr) on the phase formation and P-C-T thermodynamics' curve properties of the storage hydrogen alloys. To do that, preparation the P-C-T Measuring Device is the first step, then studied the key material, finally equip a storage hydrogen tank for application. The following result were achieved:1: P-C-T Measuring Device is the main instrument to test absorption-desorption thermodynamic characteristic of hydrogen storage material. But to equip this device is very difficult. According to the authoritative testing standard and principal of the main topic of thermodynamic studies of hydrogen storage alloy, a device and measurement treatment method of P-C-T curve for hydrogen storage alloy is investigated. Then established operation regulation and programmed the data processing program in this paper. The properties of alloy TiFe0.8Mn0.2 are measured by using the P-C-T measuring device . The result is the same as the others, so it proved the result is correct. 2: The results show that, Multi-component alloying can improve hydrogen properties of the alloy, such as the initial activation behavior and hydrogen storage capacity. TiFe0.8Mn0.2M0.05 (M= Ni, Co, Cr, La, V, Zr) alloys show better activation properties (La>V>Zr>Ni>Cr>Co) but lower desorption capacity than TiFe0.8Mno.2 alloy,however, the hydrogen storage capacity of the TiFe0.8Mn0.2La0.05 alloy reaches 1.73wt-%, and which can be hydrogenated at normal temperature and the pressure of 3.5MPa , not needing any incubation period.3: In TiFe0.8Mn0.2Lax (x=0,0.01,0.03,0.05) series alloys, La element effectively improved the activation properties when x<=0.03,but the discharge capacity decline a little when increase the content of the La element. According to the XRD, SEM andEDX, the mechanism of the activation characteristics of the modified alloys is related to the microcosmic cracks produced in the TiFe matrix and then exposure the fresh active surface by the volume expansion of the La particulates dispersing in the TiFe base phase as a result of preferential hydrogenation when initials activation. And also the activation characteristic improved by providing oxide (La2O3)-free surfaces through which hydrogen can be absorbed readily. The modified alloys not only can be activated at room temperature without any thermal treatment, but also have high hydrogen storage capacity, for example, the desorption content of TiFe0.8Mn0.2La0.03 is 1.77wt-%.4: Choose the alloy TiFe0.8Mn0.2La0.03 as the key storage hydrogen medium, and design the appropriate configuration to form a storage hydrogen tank.