Reaction kinetics of hydrogen absorption for Mg-based hydrogen-storage materials
来源期刊：中国有色金属学报(英文版)2003年第z1期
论文作者：WANG Er-de(王尔德) ZHANG Wen-cong(张文从) YU Zhen-xing(于振兴) FANG Wen-bin(房文斌) SUN Zhi-jie(孙志杰)
文章页码：50 - 53
Key words：shell-shrinking; surface decomposition; shell diffusion; rate controlling step
Abstract: The reaction kinetics of hydrogen absorption for Mg-Ni-MnO2 hydrogen-storage materials made by mechanical alloying was studied, and the absorption rate equations at different absorption steps were founded by using shell and shrinking core model. Moreover, the factors influencing the reaction process were discussed. The results show that the hydrogen absorption mainly includes surface decomposition controlling step and shell diffusion controlling step. In the beginning of the reaction, surface decomposition step was dominant and then transited to shell diffusion step with the reaction proceeding. The hydrogen absorption reaction equation founded agreed quite well with the experimental results.
WANG Er-de(王尔德)1, ZHANG Wen-cong(张文从)2,YU Zhen-xing(于振兴)3, FANG Wen-bin(房文斌)2, SUN Zhi-jie(孙志杰)2
(1. School of Materials science and Engineering,
Harbin Institute of Technology, Harbin 150001, China;
2. Research Institute for Micrometer and Nanometer Materials,
Harbin Institute of Technology (Weihai), Weihai 264209, China;
3. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China)
Abstract:The reaction kinetics of hydrogen absorption for Mg-Ni-MnO2 hydrogen-storage materials made by mechanical alloying was studied, and the absorption rate equations at different absorption steps were founded by using shell and shrinking core model. Moreover, the factors influencing the reaction process were discussed. The results show that the hydrogen absorption mainly includes surface decomposition controlling step and shell diffusion controlling step. In the beginning of the reaction, surface decomposition step was dominant and then transited to shell diffusion step with the reaction proceeding. The hydrogen absorption reaction equation founded agreed quite well with the experimental results.
Key words:shell-shrinking; surface decomposition; shell diffusion; rate controlling step
