Enhancing Hydrogen Absorption and Desorption Performance of Mg/MgH2 with Synergistic Effect of Fe3O4@G Doping and Microwave Activation AITranslate
Abstract AITranslate
Hydrogen energy，as a clean and renewable energy source，presents a promising pathway to accelerate the achievement of "Carbon neutrality" and "Carbon peak" targets. The application of hydrogen energy from generation to final use included four links，namely the preparation，storage，transportation，and application of hydrogen. Storage and transportation contributed to 30%-50% of the overall cost. Therefore，the development of safe and efficient hydrogen storage and transportation technologies was critical to unlocking the full potential of hydrogen energy applications. Among the various hydrogen storage materials，MgH2 was one of the hydrogen storage materials with the most development potential，due to its abundant resources，low price，high hydrogen storage capacity （theoretical hydrogen storage capacity was 7.6%），and good cycling performance. However，the hydrogen release temperature was high，and the hydrogen release kinetic performance was poor，which limited its large-scale application. Catalyst doping was a simple and effective method to improve the hydrogen storage performance of Mg/MgH2 system，which could provide active sites for H adsorption，dissociation，and diffusion of H2 molecules in the process of hydrogen absorption and release of Mg/MgH2，so as to improve its kinetic performance. In addition to catalyst doping，activation also played a key role in improving the hydrogen absorption and desorption reaction rates and cycling stability. Microwave was an emerging activation method in which not only was the energy absorbed by the dipole molecules and conductive electrons in a material and converted into heat，but also excited the surface electrons of the catalyst into a higher energy state which could change the path of the surface chemical reaction，such as promoting H dissociation. The microwave field could also reorient polar molecules，increasing the adsorption of reactants on the catalyst surface，thereby increasing the reaction rate. Therefore，the doping of catalysts with strong microwave absorption properties for modification could not only provide an active site for hydrogen absorption and release，but also use the various effects induced by its coupling with microwave to activate magnesium-based hydrogen storage materials and strengthen the dehydrogenation reaction process. In this study，graphene （G）-supported Fe3O4 nanoparticle （Fe3O4@G）was prepared and doped into magnesium powder via mechanical ball milling，followed by activation using microwave irradiation. The doping of Fe3O4/graphene composite in magnesium nanomaterials not only ensured effective dispersion of the catalyst and MgH2 on graphene but also facilitated activation through the strong interaction between Fe3O4/graphene and microwaves. Furthermore，graphene could construct efficient thermal transport channels for the rapid dehydrogenation process due to its high thermal conductivity. The effects of different catalyst dosages，Fe3O4/graphene ratios，and microwave activation time on the hydrogen adsorption and dehydrogenation of Mg/MgH2 were systematically studied. When studying the effect of microwave activation on the hydrogen absorption performance of the Mg-Fe3O4@G composite material，the activation time was investigated，and it was found that the hydrogen absorption kinetic performance and the maximum hydrogen storage capacity were remarkably improved by about 15% by microwave activation for 150 s. Compared with Fe3O4 and graphene single doping，Fe3O4@G composite doping could significantly improve the hydrogen storage performance of Mg. The best hydrogen storage performance was achieved when the doping amount of Fe3O4@G was 10 wt%，especially when the mass ratio of Fe3O4 to graphene was 6∶4. Mg-6Fe3O4@4G showed a high hydrogen storage capacity of 6.18 wt%. Johnson-Mehl-Avrami-Kohnogorov （JMAK）model was used to calculate the activation energy of hydrogen absorption and dehydrogenation to 56.7 and 79.89 kJ·mol−1，respectively，which were 30%-50% lower than commercial Mg/MgH2. The hydrogenation and dehydrogenation cycling performance of Mg-6Fe3O4@4G at 300 ℃ was investigated，and it was found that the capacity was maintained well after 10 cycles，with the capacity retention rate of 96%，demonstrating that the composite had good cyclic performance. The dehydrogenation process of MgH2-6Fe3O4@4G could be greatly enhanced by microwave heating，in which the dehydrogenation rate could amount to 91% after 30 s and 95% at 35 s under 1500 W microwave irradiation. The results of four conventional hydrogenation followed by microwave dehydrogenation cycles showed that the average hydrogen storage capacity retention rate of Mg-6Fe3O4@4G composite was 97.5%，and the average dehydrogenation rate was 95.5%. The Mg-6Fe3O4@4G composite had good cyclic stability，and the dehydrogenation efficiency could be significantly enhanced by microwave radiation. In order to study the principle of improving the dehydrogenation performance by microwave heating，SEM analysis was conducted on the prepared composite material before and after microwave irradiation. It was found that the composite material was broken into smaller particles after microwave heating，and the surface of the particles became rougher，showing more pores and cracks，which not only reduced the particle size of the material，but also formed cracks. The formation of a new surface accelerated the adsorption and diffusion of hydrogen，thereby improving the kinetic properties of the material. This study provided a systematic reference to improving the hydrogen absorption and desorption kinetics of Mg/MgH2 and developing a rapid dehydrogenation method which was featured by the enhancement of microwave heating.
KeyWords AITranslate
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Basic Information:
DOI：10.13373/j.cnki.cjrm.XY24080007
Chinese Library Classification Number:TK91
Citation Information:
Hydrogen energy，as a clean and renewable energy source，presents a promising pathway to accelerate the achievement of "Carbon neutrality" and "Carbon peak" targets. The application of hydrogen energy from generation to final use included four links，namely the preparation，storage，transportation，and application of hydrogen. Storage and transportation contributed to 30%-50% of the overall cost. Therefore，the development of safe and efficient hydrogen storage and transportation technologies was critical to unlocking the full potential of hydrogen energy applications. Among the various hydrogen storage materials，MgH2 was one of the hydrogen storage materials with the most development potential，due to its abundant resources，low price，high hydrogen storage capacity （theoretical hydrogen storage capacity was 7.6%），and good cycling performance. However，the hydrogen release temperature was high，and the hydrogen release kinetic performance was poor，which limited its large-scale application. Catalyst doping was a simple and effective method to improve the hydrogen storage performance of Mg/MgH2 system，which could provide active sites for H adsorption，dissociation，and diffusion of H2 molecules in the process of hydrogen absorption and release of Mg/MgH2，so as to improve its kinetic performance. In addition to catalyst doping，activation also played a key role in improving the hydrogen absorption and desorption reaction rates and cycling stability. Microwave was an emerging activation method in which not only was the energy absorbed by the dipole molecules and conductive electrons in a material and converted into heat，but also excited the surface electrons of the catalyst into a higher energy state which could change the path of the surface chemical reaction，such as promoting H dissociation. The microwave field could also reorient polar molecules，increasing the adsorption of reactants on the catalyst surface，thereby increasing the reaction rate. Therefore，the doping of catalysts with strong microwave absorption properties for modification could not only provide an active site for hydrogen absorption and release，but also use the various effects induced by its coupling with microwave to activate magnesium-based hydrogen storage materials and strengthen the dehydrogenation reaction process. In this study，graphene （G）-supported Fe3O4 nanoparticle （Fe3O4@G）was prepared and doped into magnesium powder via mechanical ball milling，followed by activation using microwave irradiation. The doping of Fe3O4/graphene composite in magnesium nanomaterials not only ensured effective dispersion of the catalyst and MgH2 on graphene but also facilitated activation through the strong interaction between Fe3O4/graphene and microwaves. Furthermore，graphene could construct efficient thermal transport channels for the rapid dehydrogenation process due to its high thermal conductivity. The effects of different catalyst dosages，Fe3O4/graphene ratios，and microwave activation time on the hydrogen adsorption and dehydrogenation of Mg/MgH2 were systematically studied. When studying the effect of microwave activation on the hydrogen absorption performance of the Mg-Fe3O4@G composite material，the activation time was investigated，and it was found that the hydrogen absorption kinetic performance and the maximum hydrogen storage capacity were remarkably improved by about 15% by microwave activation for 150 s. Compared with Fe3O4 and graphene single doping，Fe3O4@G composite doping could significantly improve the hydrogen storage performance of Mg. The best hydrogen storage performance was achieved when the doping amount of Fe3O4@G was 10 wt%，especially when the mass ratio of Fe3O4 to graphene was 6∶4. Mg-6Fe3O4@4G showed a high hydrogen storage capacity of 6.18 wt%. Johnson-Mehl-Avrami-Kohnogorov （JMAK）model was used to calculate the activation energy of hydrogen absorption and dehydrogenation to 56.7 and 79.89 kJ·mol−1，respectively，which were 30%-50% lower than commercial Mg/MgH2. The hydrogenation and dehydrogenation cycling performance of Mg-6Fe3O4@4G at 300 ℃ was investigated，and it was found that the capacity was maintained well after 10 cycles，with the capacity retention rate of 96%，demonstrating that the composite had good cyclic performance. The dehydrogenation process of MgH2-6Fe3O4@4G could be greatly enhanced by microwave heating，in which the dehydrogenation rate could amount to 91% after 30 s and 95% at 35 s under 1500 W microwave irradiation. The results of four conventional hydrogenation followed by microwave dehydrogenation cycles showed that the average hydrogen storage capacity retention rate of Mg-6Fe3O4@4G composite was 97.5%，and the average dehydrogenation rate was 95.5%. The Mg-6Fe3O4@4G composite had good cyclic stability，and the dehydrogenation efficiency could be significantly enhanced by microwave radiation. In order to study the principle of improving the dehydrogenation performance by microwave heating，SEM analysis was conducted on the prepared composite material before and after microwave irradiation. It was found that the composite material was broken into smaller particles after microwave heating，and the surface of the particles became rougher，showing more pores and cracks，which not only reduced the particle size of the material，but also formed cracks. The formation of a new surface accelerated the adsorption and diffusion of hydrogen，thereby improving the kinetic properties of the material. This study provided a systematic reference to improving the hydrogen absorption and desorption kinetics of Mg/MgH2 and developing a rapid dehydrogenation method which was featured by the enhancement of microwave heating.
quote
| GB/T 7714-2015 | [1] Jing* Sun, Shuo Lu, Shuo Chen, et al. Enhancing Hydrogen Absorption and Desorption Performance of Mg/MgH2 with Synergistic Effect of Fe3O4@G Doping and Microwave Activation[J]. Chinese Journal of Rare Metals, 2025, 49(9): 1342-1352. DOI:10.13373/j.cnki.cjrm.XY24080007. |
| MLA | [1] Jing* Sun, et al., "Enhancing Hydrogen Absorption and Desorption Performance of Mg/MgH2 with Synergistic Effect of Fe3O4@G Doping and Microwave Activation." Chinese Journal of Rare Metals, vol. 49, no. 9, 2025, pp. 1342-1352, https://doi.org/10.13373/j.cnki.cjrm.XY24080007. |
| APA | [1] Jing* Sun, Shuo Lu, Shuo Chen, Zhanlong Song, Ziliang Wang, Yanpeng Mao, & Wenlong Wang. (2025). Enhancing Hydrogen Absorption and Desorption Performance of Mg/MgH2 with Synergistic Effect of Fe3O4@G Doping and Microwave Activation. Chinese Journal of Rare Metals, 49(9), 1342-1352. https://doi.org/10.13373/j.cnki.cjrm.XY24080007 |
| IEEE | [1] Jing* Sun, Shuo Lu, Shuo Chen, Zhanlong Song, Ziliang Wang, Yanpeng Mao, and Wenlong Wang, "Enhancing Hydrogen Absorption and Desorption Performance of Mg/MgH2 with Synergistic Effect of Fe3O4@G Doping and Microwave Activation," Chinese Journal of Rare Metals, vol. 49, no. 9, pp. 1342-1352, 2025, doi: 10.13373/j.cnki.cjrm.XY24080007. keywords: {microwave;MgH;catalysis;hydrogen absorption and desorption kinetics} |