Formation and hydrogen storage behavior of nanostructured Mg2FeH6 in a compressed 2MgH2–Fe composite |
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| Affiliation: | 1. National Engineering Research Center of Light Alloy Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, PR China;2. Shanghai Engineering Research Center of Mg Materials and Applications & School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China;3. Center of Hydrogen Science, Shanghai Jiao Tong University, Shanghai, 200240, PR China;4. Shanghai Mg Power Technology Co, Ltd., Shanghai, 200240, PR China;1. National Engineering Research Center of Light Alloy Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, PR China;2. Shanghai Engineering Research Center of Mg Materials and Applications, Shanghai Jiao Tong University, Shanghai, 200240, PR China;3. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China;1. National Engineering Research Center of Light Alloy Net Forming & State Key Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China;2. Shanghai Engineering Research Center of Mg Materials and Applications & School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China;3. Institute of Applied Physics and Materials Engineering (IAPME), University of Macau, PR China;1. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, China;2. National Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;3. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;1. National Engineering Research Center of Light Alloy Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, PR China;2. Shanghai Engineering Research Center of Mg Materials and Applications & School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China;3. Center of Hydrogen Science, Shanghai Jiao Tong University, Shanghai, 200240, PR China;4. Shanghai Mg Power Technology Co, Ltd., Shanghai, 200240, PR China;1. National Engineering Research Center of Light Alloy Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, PR China;2. Center of Hydrogen Science, Shanghai Jiao Tong University, Shanghai, 200240, PR China;3. Shanghai Engineering Research Center of Mg Materials and Applications, Shanghai Jiao Tong University & Shanghai Mg Power Tech. Co. Ltd., Shanghai, 200240, PR China;4. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China;1. Department of Metallurgical Engineering, University of Utah, 135 South 1460 East, Room 412, Salt Lake City, UT 84112-0114, USA;2. Chemical Science and Engineering Division, Argonne National Laboratory, 9700 South, Cass Avenue, Lemont, IL 60439, USA;3. Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA |
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| Abstract: | The present study focuses on enhancing the yield of Mg2FeH6 and its hydrogen storage performances through a novel high-pressure compression approach. For which, MgH2 and Fe powders are first mechanically milled in a molar ratio of 2:1 and subsequently compressed to a cylindrical pellet. Due to the compression, the yield of Mg2FeH6 in the compressed 2MgH2–Fe pellet (90%) has been increased by 24% as compared to the reference ball-milled powder (66%). The thermodynamic destabilization of Mg2FeH6 in the pelletized sample is observed through measuring the pressure-composition isotherms, resulting in the reduced ab/desorption enthalpy for the pellet sample (?68.34 and 75.61 kJ/mol H2, respectively). The hydrogen uptake and release kinetics of Mg2FeH6 is remarkably fast, and it can store/release about 5 wt% H in less than 2.5 min at 400 °C. The faster hydrogen ab/desorption kinetics corresponds to the lower activation energies (36 and 95 kJ/mol H2, respectively). The excellent yield of Mg2FeH6 and its improved hydrogen storage properties for the compressed pellet are primarily attributed to the microstructural modifications upon high-pressure compression, and also the obtained results for Mg2FeH6 ternary hydride are linked to the literature data based on theoretical calculations. |
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| Keywords: | Ball-milling Compressed pellet Hydrogen storage Rietveld analysis |
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