我院研究生颜年华、教师张刘挺、郑家广、王秀珍的研究成果“Enhanced hydrogen storage properties of Mg by the synergistic effect of grain refinement andNiTiO3 nanoparticles”在《Journal of Magnesium and Alloys》上发表
发布时间: 2021-07-05 浏览次数: 10

近期,我院研究生颜年华、教师张刘挺、郑家广、王秀珍的研究成果Enhanced hydrogen storage properties of Mg by the synergistic effect of grain refinement andNiTiO3 nanoparticles在《Journal of Magnesium and Alloys》(IF=10.088)上发表。

论文简介如下:

As a promising hydrogen storage material, the practical application of magnesium is obstructed by the stable thermodynamics and sluggish kinetics. In this paper, three kinds of NiTiO3 catalysts with different mole ratio of Ni to Ti were successfully synthesized and doped into nanocrystalline Mg to improve its hydrogen storage properties. Experimental results indicated that all the Mg-NiTiO3 composites showed prominent hydrogen storage performance. Especially, the Mg-NiTiO3/TiO2 composite could take up hydrogen at room temperature and the apparent activation energy for hydrogen absorption was dramatically decreased from 69.8±1.2 (nanocrystalline Mg) kJ/mol to 34.2±0.2 kJ/mol. In addition, the hydrogenated sample began to release hydrogen at about 193.2 °C and eventually desorbed 6.6 wt% H2. The desorption enthalpy of the hydrogenated Mg-NiTiO3-C was estimated to be 78.6±0.8 kJ/mol, 5.3 kJ/mol lower compared to 83.9±0.7 kJ/mol of nanocrystalline Mg. Besides, the sample revealed splendid cyclic stability during 20 cycles. No obvious recession occurred in the absorption and desorption kinetics and only 0.3 wt%hydrogen capacity degradation was observed. Further structural analysis demonstrates that nanosizing and catalyst doping led to a synergistic effect on the enhanced hydrogen storage performance of Mg-NiTiO3-C composite, which might serve as a reference for future design of highly effective hydrogen storage materials.

 

全文下载:https://www.sciencedirect.com/science/article/pii/S221395672100075X