Highly dispersed Ni nanoparticles decorated TiO2 microspheres for enhancing hydrogen storage properties of magnesium hydride
Journal of Alloys and Compounds(2024)
摘要
While magnesium hydride (MgH2) is widely acknowledged as an encouraging solid-state hydrogen storage material, its practical utility is hampered by the elevated operating temperatures and sluggish kinetic characteristics. To address these limitations, a composite catalyst consisting of Ni nanoparticles (NPs) deposited onto TiO2 microspheres (Ni/TiO2-MS) was developed and employed as a catalytic agent to enhance the hydrogen desorption and absorption properties of MgH2. Remarkably, the introduction of Ni/TiO2-MS resulted in a significant reduction of the initial dehydrogenation temperature of MgH2 to 181.4 °C, demonstrating a decrease of 78.2 °C compared to ball-milled MgH2 (BM-MgH2). The optimal BM-MgH2-Ni/TiO2-MS facilitated the desorption of 6.3wt% of hydrogen within 5minutes at 300 °C, while at 150 °C, its dehydrogenated product could absorb 5.4wt% of hydrogen in only 1minute. Moreover, the BM-MgH2-Ni/TiO2-MS sample exhibited remarkable cycling stability over 20 cycles. Through the mechanistic analysis, the simultaneous presence of in-situ formation of Mg2Ni/Mg2NiH4 and multivalent titanium species engendered a synergistically catalytic effect, significantly enhancing the hydrogen storage capabilities of MgH2. This study affords a very potential strategy for the design of active catalysts aimed at enhancing the hydrogen dehydrogenation/absorption kinetics of MgH2.
更多查看译文
关键词
Magnesium hydride,Hydrogen storage,Ni/TiO2 microspheres,Catalytic mechanism
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要