Improve hydrogen sorption kinetics of MgH2 by doping carbon-encapsulated iron-nickel nanoparticles
Improve hydrogen sorption kinetics of MgH2 by doping carbon-encapsulated iron-nickel nanoparticles
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通过掺杂碳包覆铁镍纳米颗粒改善 MgH2 的氢吸附动力学
DOI：
10.1016/j.jallcom.2020.156035
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发表时间：
2020-11
影响因子：
6.2
通讯作者：
Han Shumin
中科院分区：
文献类型：
--
作者：
Ding Zhenmin;Fu Yaokun;Zhang Lu;Rodriguez-Perez Ismael A.;Zhang Hongming;Wang Wenfeng;Li Yuan;Han Shumin
氢化镁具有良好的吸氢动力学，对氢能的广泛应用具有重要意义。为此，为了加速镁的吸附动力学，降低其脱氢温度，我们设计并制备了一种碳膜包覆的具有核壳结构的双过渡金属合金--Fe0.64Ni0.36@C复合材料，并将其作为添加剂，通过球磨和氢化燃烧的方法合成了MgH2-Fe0.64Ni0.36@C体系。与纯MgH2相比，MgH2-Fe0.64Ni0.36@C复合材料的初始放氢温度从378℃降低到250℃，在20分钟内(150℃，3 Mpa H2)吸氢量为5.18%。更重要的是，Fe0.64Ni0.36@C掺杂的MgH_2的脱氢分解表观活化能从162.8±88.3kJ/m ol降低到86.9m±44.6kJ/m o l。MgH_2-Fe_(0.64)Ni_(0.36)@C的吸氢动力学增强主要归因于形成的Fe@C与Mg_2Ni/Mg2NiH_4的协同作用。此外，多个原位生成的活性粒子共掺杂的氢氧化镁表现出了良好的循环性能，预示着在不久的将来将在实际储氢中应用。
Magnesium hydride (MgH2) with excellent hydrogen absorption kinetics is important for the wide application of hydrogen energy. Herein, to accelerate the sorption kinetics of MgH2and lower its dehydrogenation temperature, we design and prepare a carbon film coated dual transition metal alloy, the Fe0.64Ni0.36@C composite with a core-shell structure, and employ it as an additive to synthesize MgH2–Fe0.64Ni0.36@C system by ball-milling and hydriding combustion method. In contrast to pure MgH2, the initial hydrogen release temperature of the MgH2–Fe0.64Ni0.36@C composite lowers to 250 °C from 378 °C and the composite can absorb 5.18 wt% H2within 20 min (150 °C, 3 MPa H2). More importantly, the apparent activation energy of the dehydrogenation for decomposition of Fe0.64Ni0.36@C-doped MgH2reduced from 162.8 ± 8.3 kJ/mol to 86.9 ± 4.6 kJ/mol. The enhanced hydrogen sorption kinetics of MgH2–Fe0.64Ni0.36@C mainly attributes to the synergistic effect between the formed Fe@C and Mg2Ni/Mg2NiH4. Moreover, the MgH2co-doped with the multiple in-situ formed active particles shows excellent cycling performance, indicative of potential application in practical hydrogen storage in the near future.
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