Yang Xinglin, Ji Liang, Yan Nianhua, Sun Ze, Lu Xiong, Zhang Liuting, Zhu Xinqiao, Chen Lixin
School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China.
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621999, China.
Dalton Trans. 2019 Sep 7;48(33):12699-12706. doi: 10.1039/c9dt02084e. Epub 2019 Aug 6.
Magnesium hydride (MgH) is considered as a promising hydrogen storage material for "hydrogen economy" due to its high capacity; however, its stable thermodynamics and slow kinetics hinder its practical applications. Transition metal catalysts attract intense interest in modifying MgH systems. Herein, FeCo nanosheets with a thickness of 50 nm were successfully prepared and confirmed to have superior catalytic effects on MgH. The nano-FeCo-catalyzed MgH started to release hydrogen at 200 °C which ended at 320 °C, while the hydrogen desorption process of pure MgH occurred at 350-420 °C. Besides, the dehydrogenated FeCo-containing sample could rapidly take up 6.7 wt% H within 1 min at 300 °C. Furthermore, after doping with nano-FeCo, the activation energy of hydrogen desorption and absorption was dramatically reduced to 65.3 ± 4.7 kJ mol and 53.4 ± 1.0 kJ mol, respectively. In a word, our findings may provide references for designing and producing nano-level intermetallic catalysts for the research area of hydrogen storage or other energy-related research.
氢化镁（MgH）因其高储氢容量而被视为“氢能经济”中一种很有前景的储氢材料；然而，其稳定的热力学性质和缓慢的动力学阻碍了它的实际应用。过渡金属催化剂在改性MgH体系方面引起了广泛关注。在此，成功制备了厚度为50 nm的FeCo纳米片，并证实其对MgH具有优异的催化效果。纳米FeCo催化的MgH在200℃开始放氢，320℃结束，而纯MgH的氢解吸过程发生在350 - 420℃。此外，脱氢后的含FeCo样品在300℃下1分钟内可快速吸收6.7 wt%的H。此外，掺杂纳米FeCo后，氢解吸和吸收的活化能分别大幅降至65.3±4.7 kJ mol和53.4±1.0 kJ mol。总之，我们的研究结果可为储氢研究领域或其他能源相关研究设计和生产纳米级金属间催化剂提供参考。
