MoSe2 hollow nanospheres decorated with FeNi3 nanoparticles for enhancing the hydrogen storage properties of MgH2
MoSe2 hollow nanospheres decorated with FeNi3 nanoparticles for enhancing the hydrogen storage properties of MgH2
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FeNi3纳米粒子修饰的MoSe2空心纳米球增强MgH2的储氢性能
DOI：
10.1016/j.jallcom.2020.154631
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发表时间：
2020-07-25
影响因子：
6.2
通讯作者：
Yan, Mi
中科院分区：
文献类型：
--
作者：
Gao, Shichao;Wang, Hui;Yan, Mi
首次将湿化学法合成的FeNi3、MoSe2和MoSe2@FeNi3中空纳米球用于改善氢氧化镁的储氢性能。结果表明，它们在氢气的脱附/吸附反应中均具有良好的催化活性。由于MoSe2和FeNi3的协同催化作用，MoSe2@FeNi3的催化效果最为突出。具体而言，引入10wt%MoSe2@FeNi3后，MgH2的起始脱氢温度从310℃降低到194℃，最大脱氢速率提高了19.8倍。此外，掺杂10wt%MoSe2@FeNi3的氢气样品，5.8wt%H-2在150℃下可以在0.5min内吸氢，而未掺杂的氢气样品在相同条件下几乎不吸氢。该复合材料的吸氢起始温度仅为73℃，更重要的是，它具有良好的循环稳定性。这是因为原位生成的镁硒、钼、镁镍和铁在脱氢/加氢过程中可以作为活性物种，并且它们及其在镁氢化物上的均匀分布能够保持稳定。此外，镁镍的存在可以使氢气转化为更容易的吸放氢途径。这些都有助于提高氢氧化镁的储氢性能。(C)2020爱思唯尔B.V.保留所有权利。
The FeNi3, MoSe2 and MoSe2@FeNi3 hollow nano-spheres synthesized by wet chemical method are used for the first time to improve the hydrogen storage properties of the MgH2. The results show that they all possess excellent catalytic activity in the hydrogen desorption/sorption reactions of MgH2. Because of the synergistic catalytic effect of MoSe2 and FeNi3, the MoSe2@FeNi3 has the most outstanding catalytic effect. In detail, the onset dehydrogenation temperature of MgH2 is reduced from 310 degrees C to 194 degrees C, and its maximum dehydrogenation rate is increased by 19.8 times by the introduction of 10 wt% MoSe2@FeNi3. Furthermore, the 10 wt% MoSe2@FeNi3-doped MgH2 sample, 5.8 wt% H-2 can be absorbed in 0.5 min at 150 degrees C. However, the un-doped MgH2 sample hardly absorbs hydrogen under the same conditions. The onset hydrogen absorption temperature of the composite is only 73 degrees C. More importantly, it has an excellent cycling stability. These improvements are because the in situ formed MgSe, Mo, Mg2Ni and Fe can serve as active species, and they as well as their homogeneous distribution on MgH2 matrix can remain stable during dehydrogenation/hydrogenation. In addition, the presence of Mg2Ni can convert MgH2 to an easier pathway of hydrogen absorption/desorption. These help to facilitate the hydrogen storage performance of MgH2. (c) 2020 Elsevier B.V. All rights reserved.