Sazelee Noratiqah, Md Din Muhamad Faiz, Ismail Mohammad
Energy Storage Research Group, Faculty of Ocean Engineering Technology and Informatics, University Malaysia Terengganu, Kuala Nerus 21030, Malaysia.
Department of Electrical and Electronic Engineering, Faculty of Engineering, National Defence University of Malaysia, Kem Sungai Besi, Kuala Lumpur 57000, Malaysia.
Materials (Basel). 2023 Mar 8;16(6):2176. doi: 10.3390/ma16062176.
Magnesium hydrides (MgH) have drawn a lot of interest as a promising hydrogen storage material option due to their good reversibility and high hydrogen storage capacity (7.60 wt.%). However, the high hydrogen desorption temperature (more than 400 °C) and slow sorption kinetics of MgH are the main obstacles to its practical use. In this research, nickel zinc oxide (NiZnO) was synthesized via the solid-state method and doped into MgH to overcome the drawbacks of MgH. The onset desorption temperature of the MgH-10 wt.% NiZnO sample was reduced to 285 °C, 133 °C, and 56 °C lower than that of pure MgH and milled MgH, respectively. Furthermore, at 250 °C, the MgH-10 wt.% NiZnO sample could absorb 6.50 wt.% of H and desorbed 2.20 wt.% of H at 300 °C within 1 h. With the addition of 10 wt.% of NiZnO, the activation energy of MgH dropped from 133 kJ/mol to 97 kJ/mol. The morphology of the samples also demonstrated that the particle size is smaller compared with undoped samples. It is believed that in situ forms of NiO, ZnO, and MgO had good catalytic effects on MgH, significantly reducing the activation energy and onset desorption temperature while improving the sorption kinetics of MgH.
氢化镁（MgH）作为一种有前景的储氢材料选择，因其良好的可逆性和高储氢容量（7.60重量%）而备受关注。然而，MgH的高脱氢温度（超过400℃）和缓慢的吸附动力学是其实际应用的主要障碍。在本研究中，通过固态法合成了镍锌氧化物（NiZnO）并将其掺杂到MgH中以克服MgH的缺点。MgH-10重量%NiZnO样品的起始脱氢温度分别比纯MgH和球磨MgH降低了133℃和56℃，降至285℃。此外，在250℃时，MgH-10重量%NiZnO样品在1小时内可吸收6.50重量%的H，并在300℃时解吸2.20重量%的H。添加10重量%的NiZnO后，MgH的活化能从133 kJ/mol降至97 kJ/mol。样品的形态也表明，与未掺杂样品相比，其粒径更小。据信，原位形成的NiO、ZnO和MgO对MgH具有良好的催化作用，显著降低了活化能和起始脱氢温度，同时改善了MgH的吸附动力学。
