Metal organic framework supported niobium pentoxide nanoparticles with exceptional catalytic effect on hydrogen storage behavior of MgH2
Metal organic framework supported niobium pentoxide nanoparticles with exceptional catalytic effect on hydrogen storage behavior of MgH2
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金属有机骨架负载的五氧化二铌纳米粒子对 MgH2 储氢行为具有优异的催化作用
DOI：
10.1016/j.gee.2021.09.004
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发表时间：
2021-09
影响因子：
13.3
通讯作者：
Lixin Chen
中科院分区：
文献类型：
--
作者：
Liuting Zhang;Farai Michael Nyahuma;Haoyu Zhang;Changshan Cheng;Jiaguang Zheng;Fuying Wu;Lixin Chen
采用简单的一锅水热反应和煅烧工艺，成功地合成了平均粒径为10 nm的十二面体金属有机骨架（MOF）纳米颗粒。实验结果表明，所制备的催化剂显著提高了MgH2的储氢性能。7wt % Nb2O5@MOF掺杂的mgh2在181.9℃开始解吸氢，在275℃和250℃分别在2.6 min和6.3 min内释放出6.2 wt%的氢。完全脱氢的复合材料在175°C和150°C下，将起始吸收温度降低到25°C，在6 min内分别吸收4.9 wt%和6.5 wt%的氢，表现出优异的加氢效果。解吸反应的活化能为75.57±4.16 kJ mol−1，吸附反应的活化能为51.38±1.09 kJ mol−1。循环20次后，MgH2+7 wt% Nb2O5@MOF复合材料的氢容量损失为0.5 wt%，远低于MgH2+7 wt% nb2o5复合材料的1.5 wt%。而Nb2O5@MOF的加入对MgH2脱氢焓的降低作用有限。显微结构分析表明，nb2o5颗粒均匀分布在mgh2基体表面，并与MOF协同提高了mgh2的储氢性能。
Nb2O5nanoparticles with an average particle size of 10 nm supported on a rhombic dodecahedral metal organic framework (MOF) were successfully synthesized by a facile one-pot hydrothermal reaction and subsequent calcination process. Experimental results demonstrated that the prepared catalyst drastically improved the hydrogen storage behavior of MgH2. 7 wt% Nb2O5@MOF doped MgH2started to desorb hydrogen at 181.9 °C and 6.2 wt% hydrogen could be released within 2.6 min and 6.3 min at 275 °C and 250 °C, respectively. The fully dehydrogenated composite also displayed excellent hydrogenation by decreasing the onset absorption temperature to 25 °C and taking up 4.9 wt% and 6.5 wt% hydrogen within 6 min at 175 °C and 150 °C, respectively. Moreover, the corresponding activation energy was calculated to be 75.57 ± 4.16 kJ mol−1for desorption reaction and 51.38 ± 1.09 kJ mol−1for absorption reaction. After 20 cycles, 0.5 wt% hydrogen capacity was lost for the MgH2+7 wt% Nb2O5@MOF composite, much lower than 1.5 wt% of the MgH2+7 wt% Nb2O5composite. However, the addition of Nb2O5@MOF had limited effect on reducing the dehydrogenation enthalpy of MgH2. Microstructure analysis revealed that Nb2O5particles were uniformly distributed on surface of the MgH2matrix and synergistically improved the hydrogen storage property of MgH2with MOF.
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