Kim Min-Gyeom, Lee Young-Hwan, Han Jeong-Heum, Hong Tae-Whan
Department of Advanced Material Science & Engineering, Korea National University of Transportation, Daehak-ro 72, Chungju, Chungbuk, 380-702, Republic of Korea.
J Nanosci Nanotechnol. 2020 Jan 1;20(1):611-615. doi: 10.1166/jnn.2020.17269.
Magnesium hydride has a high hydrogen storage capacity (7.6 wt.%), and is cheap and lightweight, thus advantageous as a hydrogen storage alloy. However, Mg-based hydrides undergo hydrogenation/ dehydrogenation at high temperature and pressure due to their thermodynamic stability and high oxidation reactivity. Various attempts have been made to lower the reaction rate and dehydrogenation temperature by adding transition elements (e.g., Ti, Fe, Co, Ni, Ce), metal oxides, and intermetallic compounds to overcome these shortcomings. On the other hand, carbon materials have been mainly studied in the field of hydrogen storage with high specific surface area and lightweight properties; however, results show that they cannot store a large amount of hydrogen. Recently, it has been theoretically reported that carbon materials act as adsorbents in hydrogen storage. This study focuses on the hydrogenation behavior of MgHx-CaO and MgHx-CaO-MWCNT composites prepared by hydrogen-induced mechanical alloying, and investigates the properties of these composite materials.
氢化镁具有较高的储氢容量（7.6重量%），且价格低廉、重量轻，因此作为储氢合金具有优势。然而，由于其热力学稳定性和高氧化反应活性，镁基氢化物在高温高压下进行氢化/脱氢反应。人们已经进行了各种尝试，通过添加过渡元素（如钛、铁、钴、镍、铈）、金属氧化物和金属间化合物来降低反应速率和脱氢温度，以克服这些缺点。另一方面，碳材料因其高比表面积和轻质特性，在储氢领域得到了主要研究；然而，结果表明它们不能储存大量氢气。最近，理论上报道碳材料在储氢中可作为吸附剂。本研究聚焦于通过氢致机械合金化制备的MgHx-CaO和MgHx-CaO-MWCNT复合材料的氢化行为，并研究这些复合材料的性能。
