Small hydrogen storage tank filled with 2LiBH4MgH2 nanoconfined in activated carbon: Reaction mechanisms and performances |
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| Affiliation: | 1. School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand;2. Mechanical System Division, Synchrotron Light Research Institute (Public Organization), Nakhon Ratchasima 30000, Thailand;3. Center of Excellent on Advanced Functional Materials (CoE-AFM), Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand;4. Research Network NANOTEC-SUT on Advanced Nanomaterials and Characterization, School of Chemistry, Suranaree University, Nakhon Ratchasima 30000, Thailand;1. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, China;2. Water Affairs Research Institute, North China University of Water Resource and Electric Power, Zhengzhou, 450000, China;3. Shandong Jiaotong University, Jinan, 250357, China;1. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Centro Atómico Bariloche (CNEA), Av. Bustillo 9500, R8402AGP, S. C. de Bariloche, Río Negro, Argentina;2. Instituto Balseiro, Universidad Nacional de Cuyo, Argentina;1. School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand;2. Center of Excellent on Advanced Functional Materials (CoE-AFM), Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand;3. Synchrotron Light Research Institute, Nakhon Ratchasima, 30000, Thailand |
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| Abstract: | De/rehydrogenation performances and reaction pathways of nanoconfined 2LiBH4 MgH2 into activated carbon (AC) packed in small hydrogen storage tank are proposed for the first time. Total and material storage capacities upon five hydrogen release and uptake cycles are 3.56–4.55 and 2.03–3.28 wt % H2, respectively. Inferior hydrogen content to theoretical capacity (material capacity of 5.7 wt % H2) is due to partial dehydrogenation during sample preparation and incomplete decomposition of LiBH4 as well as the formation of thermally stable Li2B12H12 upon cycling. Two-step dehydrogenation of MgH2 and LiBH4 to produce Mg and MgB2+LiH, respectively is found at all positions in the tank. For rehydrogenation, reversibility of MgH2 and LiBH4 proceeds via different reaction mechanisms. Although isothermal condition (Tset = 350 °C) and controlled pressure range (e.g., 30–40 bar H2 for hydrogenation) are applied, temperature gradient inside the tank and poor hydrogen diffusion through hydride bed, especially in the sample bulk are detected. This results in alteration of de/rehydrogenation pathways of hydrides at different positions in the tank. Thus, further development of hydrogen storage tank based 2LiBH4MgH2 nanoconfined in AC includes the improvement of thermal conductivity of materials and temperature control system as well as hydrogen permeability. |
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| Keywords: | Solid state hydrogen storage Hydride composite Chemisorption Melt infiltration Reaction mechanisms |
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