Fast hydrogen absorption/desorption kinetics in reactive milled Mg-8 mol% Fe nanocomposites |
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| Affiliation: | 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. Hydrogen Energy Centre, Department of Physics, Banaras Hindu University, Varanasi 221005, U.P, India;2. Department of Physics, Mahatma Gandhi Central University, Motihari, 845401, Bihar, India;3. Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida, 201309, India;4. Department of Chemical Engineering and Technology, Indian Institute of Technology, Banaras Hindu University, Varanasi, 221005, India;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. Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, Rodovia Washington Luiz, km 235, CEP 13565 – 905, São Carlos, SP, Brazil;2. Instituto de Pesquisas Energéticas e Nucleares (IPEN), Av. Lineu Prestes 2242, Cidade Universitária, CEP: 05508-000, São Paulo, SP, Brazil;1. Universidade Federal de São Carlos (UFSCar), Rod. Washington Luis, km 235, SP-310, CEP 13565-905, São Carlos, SP, Brazil;2. Programa de Pós-graduação em Ciência e Engenharia de Materiais, Universidade Federal de São Carlos, São Carlos, SP, Brazil;3. Laboratório Nacional de Luz Síncrotron (LNLS), Centro Nacional de Pesquisa em Energia e Materiais (CNPEM), Campinas, SP, Brazil;4. Faculdade de Ciências Aplicadas, Universidade Estadual de Campinas, Limeira, SP, Brazil;1. College of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China;2. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621999, PR China;3. Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, PR China |
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| Abstract: | This study aims to better understand the Fe role in the hydrogen sorption kinetics of Mg–Fe composites. Mg-8 mol% Fe nanocomposites produced by high energy reactive milling (RM) for 10 h resulted in MgH2 mixed with free Fe and a low fraction of Mg2FeH6. Increasing milling time to 24 h allowed formation of a high fraction of Mg2FeH6 mixed with MgH2. The hydrogen absorption/desorption behavior of the nanocomposites reactive milled for 10 and 24 h was investigated by in-situ synchrotron X-ray diffraction, thermal analyses and kinetics measurements in Sieverts-type apparatus. It was found that both 10 and 24 h milled nanocomposites presents extremely fast hydrogen absorption/desorption kinetics in relatively mild conditions, i.e., 300–350 °C under 10 bar H2 for absorption and 0.13 bar H2 for desorption. Nanocomposites with MgH2, low Fe fraction and no Mg2FeH6 are suggested to be the most appropriate solution for hydrogen storage under the mild conditions studied. |
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| Keywords: | Hydrogen storage Reactive milling Nanocomposite Magnesium hydride Complex hydride |
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