Synergistic enhancement of hydrogen storage properties in MgH2 using LiNbO3 catalyst |
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| Affiliation: | 1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China;1. College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, PR China;2. College of Materials Science and Engineering, Qiqihar University, Qiqihar 161006, PR China;3. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, PR China;1. College of Materials Science and Engineering, Nanjing Tech University, Puzhu South Road No.30, 211816, Nanjing, Jiangsu, China;2. The Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Puzhu South Road No.30, 211816, Nanjing, Jiangsu, China;3. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Puzhu South Road No.30, 211816, Nanjing, Jiangsu, China;1. Key Laboratory for Nonferrous Materials (MOE), School of Materials Science and Engineering, Central South University, Changsha, 410083, China;2. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621900, China;1. School of Chemistry and Environmental Engineering, Key Laboratory of Green Chemistry of Sichuan Institutes of Higher Education, Sichuan University of Science & Engineering, Sichuan Zigong, 643000, PR China;2. Radiation Chemistry Department, Sichuan Institute of Atomic Energy, Sichuan Chengdu, 610101, PR China;3. College of Chemistry and Materials Science, Sichuan Normal University, Sichuan Chengdu, 610068, PR China |
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| Abstract: | Extensive researches are being conducted to improve the high dehydrogenation temperature and sluggish hydrogen release rate of magnesium hydride (MgH2) for better industrial application. In this study, LiNbO3, a catalyst composed of alkali metal Li and transition metal Nb, was prepared through a direct one-step hydrothermal synthesis, which remarkably improved the hydrogen storage performance of MgH2. With the addition of 6 wt% LiNbO3 in MgH2, the initial dehydrogenation temperature decreases from 300 °C to 228 °C, representing a drop of almost 72 °C compared to milled MgH2. Additionally, the MgH2-6 wt.% LiNbO3 composite can quickly release 5.45 wt% of H2 within 13 min at 250 °C, and absorbed about 3.5 wt% of H2 within 30 min at 100 °C. It is also note that LiNbO3 shows better catalytic effect compared to solely adding Li2O or Nb2O5. Furthermore, the activation energy of MgH2-6 wt.% LiNbO3 decreased by 44.37% compared to milled MgH2. The enhanced hydrogen storage performance of MgH2 is attributed to the in situ formation of Nb-based oxides in the presence of LiNbO3, which creates a multielement and multivalent chemical environment. |
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| Keywords: | Hydrogen storage kinetics Catalytic effect |
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