Effect of LaCoO3 Synthesized via Solid-State Method on the Hydrogen Storage Properties of MgH2

Abstract

One of the ideal energy carriers for the future is hydrogen. It has a high energy density and is a source of clean energy. A crucial step in the development of the hydrogen economy is the safety and affordable storage of a large amount of hydrogen. Thus, owing to its large storage capacity, good reversibility, and low cost, Magnesium hydride (MgH2) was taken into consideration. Unfortunately, MgH2 has a high desorption temperature and slow ab/desorption kinetics. Using the ball milling technique, adding cobalt lanthanum oxide (LaCoO3) to MgH2 improves its hydrogen storage performance. The results show that adding 10 wt.% LaCoO3 relatively lowers the starting hydrogen release, compared with pure MgH2 and milled MgH2. On the other hand, faster ab/desorption after the introduction of 10 wt.% LaCoO3 could be observed when compared with milled MgH2 under the same circumstances. Besides this, the apparent activation energy for MgH2–10 wt.% LaCoO3 was greatly reduced when compared with that of milled MgH2. From the X-ray diffraction analysis, it could be shown that in-situ forms of MgO, CoO, and La2O3, produced from the reactions between MgH2 and LaCoO3, play a vital role in enhancing the properties of hydrogen storage of MgH2.

Enhancement of the Desorption Properties of LiAlH4 by the Addition of LaCoO3

“…In this study, LaCoO3 was used as an additive and was synthesized using the solidstate method as discussed in our previous research [49]. A total of 0.121 g of citric acid (≥98% pure; Sigma Aldrich , St. Louis, Missouri, United State), 0.081 g of lanthanum oxide (≥99.9% pure; Aldrich Chemical Compound, Milwaukee, WI, USA) and 0.040 g of pure cobalt oxide (99.99% pure, Sigma Aldrich) were ground in an agate mortar and calcined at 950 °C in a furnace for 5 h. Different weight percentages of pure LaCoO3 (5, 10, 15 and 20) were milled in a planetary ball mill (NQM−0.4) with LiAlH4 (95% pure, Sigma Aldrich) for an hour (15 min milling time, 2 min resting time with 3 cycles) at a rotational speed of 400 rpm with a ball to powder ratio of 40:1.…”

Microstructure Characteristics and Hydrogen Storage Kinetics of Mg77+xNi20−xLa3 (x = 0, 5, 10, 15) Alloys

“…A great deal of experimental researchers have been conducted in the last few decades to address the drawback of Mg-based alloys, such as alloying [ 19 , 20 , 21 ], nano-crystallization [ 22 , 23 , 24 ], doping catalyst [ 25 , 26 , 27 ] and exploring new treatment methods [ 28 , 29 , 30 ], etc. By alloying various transition metals (TM) with Mg, TM was found to reduce the thermal stability of MgH 2 and enhance the hydrogen reaction kinetics of MgH 2 [ 31 , 32 ].…”

Effect of One Step Solid State Reaction Route on the Semiconductor Behavior of the Spinel (NI, Co, and Mn)O4 to Be Used as Temperature Sensor

“…The solid-state reaction (SSR) is a cost-effective and straightforward method that offers several advantages in materials synthesis and processing, including its simplicity of composition control [ 10 , 11 , 12 ]. Especially, SSR facilitates the pelletization of crystalline oxide, including NMC, thereby enabling its easy integration for industrial applications: for example, solid NMC pellets are tailored to small sensor components, which are integrated onto the printed circuit boards (PCBs) for generating a temperature sensor through a well-established packaging process [ 13 ].…”