Effect of milling duration on hydrogen storage thermodynamics and kinetics of Mg-based alloy |
| |
| Affiliation: | 1. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou, 014010, China;2. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing, 100081, China;3. Weishan Cisri-Rare Earth Materials Co., Ltd., Jining, 277600, China;1. Programa de Pós-graduação em Ciência e Engenharia de Materiais, Universidade Federal de São Carlos, Rod. Washington Luiz, km 235, SP-310, CEP 13565-905, São Carlos, SP, Brazil;2. Departamento de Engenharia de Materiais, Universidade Federal de São Carlos (UFSCar), Rod. Washington Luis, km 235, SP-310, CEP 13565-905, São Carlos, SP, Brazil;3. Departamento de Engenharia Metalúrgica e Materiais, Universidade Federal de Minas Gerais, Rua Espirito Santo, 35, CEP 30160-030, Belo Horizonte, MG, Brazil;4. Laboratório Nacional de Luz Síncrotron (LNLS), Centro Nacional de Pesquisa em Energia e Materiais (CNPEM), Rua Giuseppe Máximo Scolfaro, 10000, Campinas, SP, CP 6192, CEP 13083-970, Campinas, SP, Brazil;1. School of Materials Science and Engineering and Fujian Provincial Key Laboratory of Functional Materials and Applications, Xiamen University of Technology, Xiamen 361024, China;2. School of Marine Engineering and Fujian Provincial Key Laboratory of Naval Architecture and Ocean Engineering, Jimei University, Xiamen 361021, China;3. Institute of Advanced Wear & Corrosion Resistance and Functional Materials, Jinan University, Guangzhou 510632, China;1. College of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (MOE), Nankai University, Tianjin 300071, PR China;2. Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin 300071, China;1. Institute of Problems of Chemical Physics of RAS, Chernogolovka, 142432, Russia;2. HySA Systems Centre of Competence, South African Institute for Advanced Materials Chemistry, University of the Western Cape, Bellville, 7535, South Africa;3. Institute for Energy Technology, Kjeller, NO 2027, Norway |
| |
| Abstract: | Mechanical milling is widely recognized as the best method to prepare nano-structured magnesium based hydrogen storage materials. The composites La7Sm3Mg80Ni10 + 5 wt% TiO2 (named La7Sm3Mg80Ni10–5TiO2) whose structures are nano-crystal and amorphous accompanied by great hydrogen absorption and desorption properties were fabricated by mechanical milling. The research focuses on the effect of milling duration on the thermodynamics and dynamics. The instruments of researching the gaseous hydrogen storing performances include Sievert apparatus, DSC and TGA. The calculation of dehydrogenation activation energy was realized by applying Arrhenius and Kissinger formulas. The calculation results show the specimen milled for 10 h exhibits the optimal activation performance and hydrogenation and dehydrogenation kinetics. Extending or shrinking the milling duration will lead to the degradation of hydrogen storage performances. The as-milled (10 h) alloy at the full activated state can absorb 4 wt% hydrogen in 87 s at 473 K and 3 MPa and release 3 wt% H2 in 288 s at 573 K and 1 × 10−4 MPa. The changed milling durations have little impact on the thermodynamic properties of experimental samples and the enthalpy change (ΔH) of the alloy milled for 10 h is 74.23 kJ/mol. Moreover, it is found that the as-milled (10 h) alloy displays the minimum apparent activation energy of dehydrogenation (59.1 kJ/mol), suggesting the optimal hydrogen storing property of the as-milled (10 h) alloy. |
| |
| Keywords: | Mg-based alloy Milling duration Hydrogen storage kinetics Thermodynamic properties Activation energy |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
