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Vacancy‐Mediated Hydrogen Spillover Improving Hydrogen Storage Properties and Air Stability of Metal Hydrides
Author(s) -
Shi Rui,
Yan Haoxing,
Zhang Jiguang,
Gao Haiguang,
Zhu Yunfeng,
Liu Yana,
Hu Xiaohui,
Zhang Yao,
Li Liquan
Publication year - 2021
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202100852
Subject(s) - hydrogen storage , materials science , dehydrogenation , hydrogen , hydrogen spillover , chemical engineering , passivation , cryo adsorption , metal , vacancy defect , nickel , inorganic chemistry , density functional theory , desorption , hydride , nanotechnology , metallurgy , alloy , layer (electronics) , catalysis , adsorption , chemistry , organic chemistry , computational chemistry , crystallography , engineering
Hydrogen storage in metal hydrides is a promising solution for sustainable and clean energy carriers. Although Mg‐based metal hydrides are considered as potential hydrogen storage media, severe surface passivation has limited their industrial application. In this study, a simple, cheap, and efficient method is proposed to produce highly reactive and air‐stable bulk Mg–Ni‐based hydrides by rapid treatment with water for 3 min. The nickel‐decorated Mg(OH) 2 nanosheets formed in situ during hydrolysis can provide a pathway for hydrogen desorption via vacancy‐mediated hydrogen spillover, as revealed by density functional theory calculations, thereby significantly decreasing the peak dehydrogenation temperature by 108.2 °C. Moreover, water‐activated hydrides can be stored under ambient conditions without surface decay and activity loss, exhibiting excellent air stability, which can be attributed to the chemical stability of the surface layer. The results provide alternative insights into the design of highly active, air‐stable metal hydrides with low cost and promote the industrial application of hydrogen energy.