首页|Modulated noble metal/2D MOF heterostructures for improved hydrogen storage of MgH2

Modulated noble metal/2D MOF heterostructures for improved hydrogen storage of MgH2

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The conjugation of external species with two-dimensional(2D)materials has broad application pro-spects.In this study,we have explored the potential of noble metal/2D MOF heterostructures in hydrogen storage.Specifically,the MgH2-Ni-MOF@Pd system has shown remarkable hydrogen desorption/sorption performances,starting to liberate hydrogen at 181 ℃,which is 230 ℃ lower than that of pristine MgH2.Under the catalytic effect of Ni-MOF@Pd,the dehydrogenation apparent activation energy of MgH2 is noticeably decreased from(133.5±17.5)to(34.58±1.87)kJ·mol-1,and the hydrogenation apparent activation energy is reduced from(70.41+7.43)to(25.78±4.64)kJ·mol-1,which is lowered by 63.4％.The fully-dehydrogenated MgH2-Ni-MOF@Pd composite rapidly uptakes hydrogen,with 2.62 wt％at 100 ℃ and 6.06 wt％at 150 ℃ within 300 s,respectively.The mechanism analysis of MgH2 catalyzed by Ni-MOF@Pd has revealed that the transformation of Mg2Ni and Mg2NiH4 could act as a"hydrogen pump",providing numerous channels for fast diffusion and trans-port of hydrogen atoms.Moreover,in the dehydrogenation process,the element Pd reacts with MgH2 to form the Mg-Pd alloy phase,which makes MgH2 take precedence to decompose through the Mg-Pd alloy rather than self-de-composition,further reducing thermal stability and improving de/hydrogenation kinetics.The synergistic effect of Mg-Pd,Mg2Ni,and the special ultra-thin 2D sheet structure of the additive is the main reason for the good hydrogen storage property of MgH2-Ni-MOF@Pd.Our findings provide inspiration for designing efficient multi-functional additives with unique morphologies to optimize the hydrogen desorption/sorption behaviors of hydrogen storage materials.

Hydrogen storageMagnesium hydride2D metal-organic framework nanosheetsNi/PdSynergistic catalysis

Zeng-Yi Li、Li-Xian Sun、Fen Xu、Yu-Mei Luo、Yong-Peng Xia、Sheng Wei、Chen-Chen Zhang、Ri-Guang Cheng、Chao-Feng Ye、Meng-Yuan Liu、Ju-Lan Zeng、Zhong Cao、Hong-Ge Pan

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School of Material Science and Engineering,Guilin University of Electronic Technology,Guilin 541004,China

School of Chemistry and Chemical Engineering,Changsha University of Science and Technology,Changsha 410114,China

Institute of Science and Technology for New Energy,Xi'an Technological University,Xi'an 710021,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaScientific Research and Technology Development Program of GuangxiScientific Research and Technology Development Program of GuangxiScientific Research and Technology Development Program of GuangxiScientific Research and Technology Development Program of GuangxiScientific Research and Technology Development Program of GuangxiNational Natural Science Foundation of Guangxi ProvinceNational Natural Science Foundation of Guangxi ProvinceNational Natural Science Foundation of Guangxi ProvinceNational Natural Science Foundation of Guangxi ProvinceNational Natural Science Foundation of Guangxi ProvinceScientific Research and Technology Development Program of GuilinScientific Research and Technology Development Program of GuilinGuangxi Bagui Scholar Foundation,Guilin Lijiang Scholar FoundationGuangxi Collaborative Innovation Centre of Structure and Property for New Energy and MaterialsGuangxi Advanced Functional Materials FoundationApplication Talents Small Highlands and Chinesisch-Deutsche Kooperationsgruppe

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2024

10.1007/s12598-023-02496-6

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(4)
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