Improving the hydrogen storage performance of MgH_(2) by compositing with Ce/N-codoped TiO_(2)OA
MgH_(2) shows promise for solid-state hydrogen storage because of its high gravimetric capacity(7.6%)and ecofriendliness but cannot be easily commercialized because of its sluggish dehydrogenation/rehydrogenation kinetics and high thermodynamic stability.Herein,Ce/N-codoped TiO_(2)(CN-T)synthesized using a solvothermal/calcination method was composited with MgH_(2) to enhance its hydrogen storage performance.The composite with a CN-T loading of 7 wt%started releasing H_(2) at 187.2℃ and released 6.45 wt.%H_(2) in 180 s at 301℃,which corresponded to nearly complete dehydrogenation.The residue could be rapidly rehydrogenated,with hydrogen contents of 3.24 and 5.45 wt%achieved in 1 min at 100℃/20 bar H_(2) and 5 min at 200℃/20 bar H_(2),respectively.This performance enhancement was attributed to the combined effects of doped N,multivalent Ti,and Ce.The doped N weakened Mg-H bonds via charge transfer and modified the electronic state density of MgH_(2).Ti catalyzed H_(2) dissociation/recombination through dynamic valence cycling and D-electron injection,and the introduction of Ce3+created O vacancies,which lowered the electron density of Mg-H bonds,generated strain fields for hydrogen release,provided diffusion pathways,and introduced bandgap states to strengthen electron-hydrogen coupling.Thus,this study paves the way for the commercialization of MgH_(2) as a green high-capacity hydrogen carrier for diverse applications.
Cheng Lv;Qingjie He;Yongjin Zou;Ruoyang Zhang;Hanjie Wen;Jiayan Huang;Jing Zhi;Cuili Xiang;Lixian Sun;Yong Shen Chua
Guangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,Guilin 541004,ChinaGuangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,Guilin 541004,ChinaGuangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,Guilin 541004,ChinaGuangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,Guilin 541004,ChinaGuangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,Guilin 541004,ChinaGuangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,Guilin 541004,ChinaGuangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,Guilin 541004,ChinaGuangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,Guilin 541004,ChinaGuangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,Guilin 541004,ChinaSchool of Chemical Sciences,Universiti Sains Malaysia,Minden,Penang 11800,Malaysia
通用工业技术
Oxygen vacancyMagnesium hydrideHydrogen storageCerium/nitrogen-codoped titania
《Journal of Magnesium and Alloys》 2026 (5)
P.628-637,10
supported by the National Natural Science Foundation of China[grant number U24A2044]the Science and Technology Major Program of Guangxi Province[grant number GUIKEAA24206007].
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