Hydrogen Release and Uptake of MgH[sub.2] Modified by Ti[sub.3]CN MXene
MgH[sub.2] has a high hydrogen content of 7.6 wt% and possesses good reversibility under normal conditions. However, pristine MgH[sub.2] requires a high temperature above 300 °C to release hydrogen, with very slow kinetics. In this work, we utilized Ti[sub.3] CN MXene to reduce the operating tempera...
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Published in | Inorganics Vol. 11; no. 6 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
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MDPI AG
01.06.2023
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Abstract | MgH[sub.2] has a high hydrogen content of 7.6 wt% and possesses good reversibility under normal conditions. However, pristine MgH[sub.2] requires a high temperature above 300 °C to release hydrogen, with very slow kinetics. In this work, we utilized Ti[sub.3] CN MXene to reduce the operating temperature and enhance the kinetics of MgH[sub.2] . The initial temperature of MgH[sub.2] decomposition can be lowered from 322 °C for pristine MgH[sub.2] to 214 °C through the employment of Ti[sub.3] CN. The desorbed MgH[sub.2] + 7.5 wt% Ti[sub.3] CN can start absorption at room temperature, while the desorbed pristine MgH[sub.2] can only start absorption at 120 °C. The employment of Ti[sub.3] CN can significantly improve the hydrogen release kinetics of MgH[sub.2] , with the desorption activation energy decreasing from 121 to 80 kJ mol[sup.−1] . Regarding thermodynamics, the desorption enthalpy changes of MgH[sub.2] and MgH[sub.2] + 7.5 wt% Ti[sub.3] CN were 79.3 and 78.8 kJ mol[sup.−1] , respectively. This indicates that the employment of Ti[sub.3] CN does not alter the thermal stability of MgH[sub.2] . Phase evolution studies through the use of X-ray diffraction and electron diffraction both confirm that Ti[sub.3] CN remains stable during the hydrogen release and uptake process of the composite. This work will help understand the impact of a transition metal carbonitride on the hydrogen storage of MgH[sub.2] . |
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AbstractList | MgH[sub.2] has a high hydrogen content of 7.6 wt% and possesses good reversibility under normal conditions. However, pristine MgH[sub.2] requires a high temperature above 300 °C to release hydrogen, with very slow kinetics. In this work, we utilized Ti[sub.3] CN MXene to reduce the operating temperature and enhance the kinetics of MgH[sub.2] . The initial temperature of MgH[sub.2] decomposition can be lowered from 322 °C for pristine MgH[sub.2] to 214 °C through the employment of Ti[sub.3] CN. The desorbed MgH[sub.2] + 7.5 wt% Ti[sub.3] CN can start absorption at room temperature, while the desorbed pristine MgH[sub.2] can only start absorption at 120 °C. The employment of Ti[sub.3] CN can significantly improve the hydrogen release kinetics of MgH[sub.2] , with the desorption activation energy decreasing from 121 to 80 kJ mol[sup.−1] . Regarding thermodynamics, the desorption enthalpy changes of MgH[sub.2] and MgH[sub.2] + 7.5 wt% Ti[sub.3] CN were 79.3 and 78.8 kJ mol[sup.−1] , respectively. This indicates that the employment of Ti[sub.3] CN does not alter the thermal stability of MgH[sub.2] . Phase evolution studies through the use of X-ray diffraction and electron diffraction both confirm that Ti[sub.3] CN remains stable during the hydrogen release and uptake process of the composite. This work will help understand the impact of a transition metal carbonitride on the hydrogen storage of MgH[sub.2] . |
Audience | Academic |
Author | Liu, Haizhen Wang, Kuikui Tang, Haimei Li, Yun Duan, Xingqing Huang, Xiantun Lu, Chenglin |
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Snippet | MgH[sub.2] has a high hydrogen content of 7.6 wt% and possesses good reversibility under normal conditions. However, pristine MgH[sub.2] requires a high... |
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Title | Hydrogen Release and Uptake of MgH[sub.2] Modified by Ti[sub.3]CN MXene |
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