The hydrogen storage properties and catalytic mechanism of the CuFe2O4-doped MgH2 composite system |
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| Affiliation: | 1. Nanoengineering Research Group, Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, 3810-193 Aveiro, Portugal;2. Instituto de Soldadura e Qualidade, Taguspark, 2740 - 120 Porto Salvo, Portugal;1. Shibaura Institute of Technology, Department of Engineering Science and Mechanics, Toyosu, Koto-ku, Tokyo, 135-8548 Japan;2. Shibaura Institute of Technology, SIT Research Laboratories, Toyosu, Koto-ku, Tokyo, 135-8548 Japan;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. 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 |
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| Abstract: | The influence of CuFe2O4 addition on the sorption performances of MgH2 prepared by ball milling was studied for the first time. The MgH2 + 10 wt% CuFe2O4 sample exhibited an enhancement in hydrogen storage performance compared to that of as-milled MgH2, with the onset decomposition temperature decreased from 340 °C to 250 °C. Dehydrogenation kinetic result revealed that CuFe2O4-added MgH2 released around 5.3 wt% H2 within 10 min at 320 °C, while the as-milled MgH2 released below 1.0 wt% H2 under the same condition. Furthermore, about 5.0 wt% H2 was absorbed at 250 °C in 30 min for the 10 wt% CuFe2O4-doped MgH2 sample. In contrast, the un-doped MgH2 only absorbed 4.0 wt% H2 at 250 °C in 30 min. From the Kissinger analysis, the apparent activation energy of as-milled MgH2 was 166.0 kJ/mol and this value decreased to 113.0 kJ/mol for 10 wt% CuFe2O4-added MgH2. The enhanced sorption performance of MgH2 in the presence of CuFe2O4 is believed to be due to the role of in situ formed Fe, Mg-Cu alloy, and MgO phases as an active species to catalyse the hydrogen storage properties of MgH2. |
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| Keywords: | Solid-state storage Magnesium hydride Complex metal oxide Catalyst |
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