Numerical analysis of absorbing and desorbing mechanism for the metal hydride by homogenization method

作者：Asakuma Y^*; Miyauchi S; Yamamoto T; Aoki H; Miura T

来源：International Journal of Hydrogen Energy, 2003, 28(5): 529-536.

DOI：10.1016/S0360-3199(02)00136-2

• nucleation and growth model
• homogenization method
• diffusion coefficient
• microstructure

Storage capacity and fast reaction rate are the most important properties for hydrogen storage alloys. To clarify the mechanism of the rate-controlling step, we analyzed the hydrogen diffusion coefficients of the hydride by the homogenization method, which considers the microstructure of the alloy at the microscale (0.1-10 mum) precisely. By applying nucleation and growth model, we have discussed the absorbing and desorbing mechanism of the metal hydride. Our results and analysis show that it is important for the hydriding or dehydriding reaction to consider the number of nuclei and the transfer of hydrogen atom through the alpha-beta interface data. Estimation of the microstructure of the metal hydride by using the homogenization method is useful for the absorbing and desorbing mechanism.

• 出版日期2003-5