Effect of Ni/tubular g-C3N4 on hydrogen storage properties of MgH2
Effect of Ni/tubular g-C3N4 on hydrogen storage properties of MgH2
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Ni/管状g-C3N4对MgH2储氢性能的影响
DOI：
10.1016/j.ijhydene.2021.07.166
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发表时间：
2021-08
影响因子：
7.2
通讯作者：
Shumin Han
中科院分区：
文献类型：
--
作者：
Xinjun Li;Yaokun Fu;Yichao Xie;Lian Cong;Han Yu;Lu Zhang;Yuan Li;Shumin Han
添加剂掺杂是克服MgH 2操作温度较高、脱附动力学较慢等缺点的有效方法之一。采用水热法和高温热解法制备了直径为2 μm的空心g-C3 N4（TCN）管，并在278 K下将Ni化学还原到TCN上制备了Ni/TCN复合材料。然后通过燃烧和球磨的方法将Ni/TCN引入到MgH 2/Mg体系中。MgH 2-Ni/TCN复合材料在535 K开始放氢，比球磨态MgH 2（651 K）低116 K。MgH 2-Ni/TCN复合材料在423 K下3500 s内吸氢5.24 wt%，在373 K下3500 s内吸氢3.56 wt%。Ni/TCN的加入使MgH 2的表观活化能从161.1 kJ/mol降低到82.6 kJ/mol。此外，MgH 2-Ni/TCN样品表现出优异的循环稳定性，10次循环后的脱氢容量留存率为98.0%。碳材料通过分散和稳定MgH 2来增强吸附动力学。另外，Mg 2NiH 4和Mg 2NiH 0. 3之间的相变加速了复合材料的再脱氢反应。
Additive doping is one of the effective methods to overcome the shortcomings of MgH2on the aspect of relatively high operating temperatures and slow desorption kinetics. In this paper, hollow g-C3N4(TCN) tubes with a diameter of 2 μm are synthesized through the hydrothermal and high-temperature pyrolysis methods, and then nickel is chemically reduced onto TCN to form Ni/TCN composite at 278 K. Ni/TCN is then introduced into the MgH2/Mg system by means of hydriding combustion and ball milling. The MgH2–Ni/TCN composite starts to release hydrogen at 535 K, which is 116 K lower than the as-milled MgH2(651 K). The MgH2–Ni/TCN composite absorbs 5.24 wt% H2within 3500 s at 423 K, and takes up 3.56 wt% H2within 3500 s, even at a temperature as low as 373 K. The apparent activation energy (Ea) of the MgH2decreases from 161.1 to 82.6 kJ/mol by the addition of Ni/TCN. Moreover, the MgH2–Ni/TCN sample shows excellent cycle stability, with a dehydrogenation capacity retention rate of 98.0% after 10 cycles. The carbon material enhances sorption kinetics by dispersing and stabilizating MgH2. Otherwise, the phase transformation between Mg2NiH4and Mg2NiH0.3accelerates the re/dehydrogenation reaction of the composite.
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