Facile synthesized Fe nanosheets as superior active catalyst for hydrogen storage in MgH2 |
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| Affiliation: | 1. School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang, 212003, China;2. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621999, China;3. Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China;1. Nanoengineering Research Group, Centre for Mechanical Technology and Automation (TEMA), Department of Mechanical Engineering, University of Aveiro, 3810-193 Aveiro, Portugal;2. International Iberian Nanotechnology Laboratory (INL), Av. Mestre Jose Veiga, 4715-330 Braga, Portugal;1. Department of Energy Application Engineering, Far East University, No. 49, Zhonghua Rd., Xinshi Dist., Tainan City 74448, Taiwan;2. Department of Mechanical Engineering, National Cheng Kung University, Taiwan;1. College of Materials Science and Engineering, Nanjing Tech University, 5 Xinmofan Road, Nanjing 210009, PR China;2. Jiangsu Collaborative Innovation Centre for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 210009, PR China;3. School of Materials Science and Engineering, Southeast University, Nanjing 211189, PR China;1. State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, PR China;2. Institute of Energy Materials and Technology, General Research Institute for Non-ferrous Metals, Beijing 100088, PR China;3. Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, Hangzhou 310013, PR China;1. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621999, PR China;2. College of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang, 212003, PR China;3. Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, PR China |
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| Abstract: | Reversible hydrogen storage in MgH2 under mild conditions is a promising way for the realization of “Hydrogen Economy”, in which the development of cheap and highly efficient catalysts is the major challenge. Herein, A two-dimensional layered Fe is prepared via a facile wet-chemical ball milling method and has been confirmed to greatly enhance the hydrogen storage performance of MgH2. Minor addition of 5 wt% Fe nanosheets to MgH2 decreases the onset desorption temperature to 182.1 °C and enables a quick release of 5.44 wt% H2 within 10 min at 300 °C. Besides, the dehydrogenated sample takes up 6 wt% H2 in 10 min under a hydrogen pressure of 3.2 MPa at 200 °C. With the doping of Fe nanosheets, the apparent activation energy of the dehydrogenation reaction for MgH2 is reduced to 40.7 ± 1.0 kJ mol?1. Further ab initio calculations reveal that the presence of Fe extends the Mg–H bond length and reduces its bond strength. We believe that this work would shed light on designing plain metal for catalysis in the area of hydrogen storage and other energy-related issues. |
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| Keywords: | Hydrogen storage Magnesium hydride Fe nanosheet Catalytic effect |
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