Hydrogen release: In-situ calorimetry studies of NaBH4+2MgH2 doped by ZrF4
Hydrogen release: In-situ calorimetry studies of NaBH4+2MgH2 doped by ZrF4
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氢释放：ZrF4 掺杂的 NaBH4·2MgH2 的原位量热研究
DOI：
10.1016/j.ijhydene.2020.09.237
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发表时间：
2020-10
影响因子：
7.2
通讯作者：
Hao Yu
中科院分区：
文献类型：
--
作者：
Senliang Xi;Xiaojun Wang;Kudzaishe Caren Tome;Tonghuan Zhang;Zongying Han;Meng Gao;Shixue Zhou;Hao Yu
采用球磨法制备了ZrF 4掺杂的NaBH 4 + 2 MgH 2。用X射线衍射和扫描电镜对不同体系的结构和形貌进行了表征。通过程序升温脱附和差示扫描量热法测定了氢释放的热力学性质。采用压力成分等温法研究了催化剂的放氢动力学性质和氢含量。本工作的主要目的是通过原位量热法测量来研究氢释放热与氢释放量之间的关系。NaBH_4 + 2 MgH_2 + 0.1ZrF_4可释放约7.4wt H2两步。第一步和第二步的放氢热分别比NaBH 4 + 2 MgH 2低480.82 J·g-1和430.8 J·g-1。NaBH 4 + 2 MgH 2的脱氢焓为−243.81 kJ·mol− 1 ~ −191.2 kJ·mol−1。ZrF_4的加入改善了NaBH_4 + 2 MgH_2体系的放氢动力学性能，其放氢量可达5 wt.% H2在2.5 h内在385 °C下在0.01 MPa氢气压力下。因此，NaBH 4 + 2 MgH 2 + 0.1ZrF4作为燃料电池的供氢体系具有很好的应用前景。
In this work, NaBH4+2MgH2doped by ZrF4was prepared by the ball-milling method. The structure and the morphology of different systems were characterized by X-ray diffraction and scanning electron microscopy. The thermodynamic properties of hydrogen release were determined by temperature-programmed desorption and differential scanning calorimetry. Hydrogen desorption kinetic properties and hydrogen content were investigated by pressure composition isothermal method. The main objective of this work was to study the relationship between the heat of hydrogen release and the quantity of hydrogen released by In-situ calorimetry measurement. The NaBH4+2MgH2+0.1ZrF4can release about 7.4 wt.% H2by two steps. Firstly, the heat of hydrogen release of the first and the second steps were lower by 480.82 J·g−1and 430.8 J·g−1than that of NaBH4+2MgH2, respectively. And the dehydrogenation enthalpy of NaBH4+2MgH2went from −243.81 kJ·mol−1to −191.2 kJ·mol−1. Secondly, the addition of ZrF4can improve the hydrogen release kinetic property of NaBH4+2MgH2, which can release 5 wt.% H2in 2.5 h at 385 °C under 0.01 MPa hydrogen pressure. Therefore, NaBH4+2MgH2+0.1ZrF4will be a potential candidate as a fuel cell hydrogen supply system.
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