Oxygen vacancy in magnesium/cerium composite from ball milling for hydrogen storage improvement

Magnesium-Based Materials for Hydrogen Storage—A Scope Review

“…Metal oxides can act as agents to refine particles during BM. There is also believed to be an affinity between metal oxides and hydrogen molecules, which enables easy absorption of hydrogen on the surface [ 21 , 121 , 122 , 123 , 124 , 125 , 126 , 127 ].…”

“…Crucial changes in hydriding behavior have been noted when using metal oxides as catalysts [ 21 , 121 , 126 , 181 ]. Song et al [ 182 ] showed that the oxides Cr 2 O 3 , Al 2 O 3 , and CeO 2 influenced magnesium hydride during RBM.…”

Using Ball Milling for Modification of the Hydrogenation/Dehydrogenation Process in Magnesium-Based Hydrogen Storage Materials: An Overview

“…The reason for improved kinetics by doping transition metal oxides lies in the following: transition metal oxides are sensitive to hydrogen molecules thus even at lower temperatures a large amount of hydrogen molecules can be adsorbed on the surface, so that the hydrogen molecules are in an activated state and the bond energy between the hydrogen atoms is weakened, which makes the hydrogen molecules be decomposed easier into hydrogen atoms. Since the catalysis is usually bidirectional, the addition of a transition metal oxide is also advantageous for hydrogen desorption [99][100][101][102][103][104][105][106][107].…”

A novel Ce0.8Fe0.1Zr0.1O2 solid solution with high catalytic activity for hydrogen storage in MgH2

“…Furthermore, recent studies have demonstrated that oxygen vacancies (O vac ) are greatly important active sites for hydrogen storage which can capture H 2 molecules and help the diffusion of H atoms during the hydrogen absorption/desorption processes. 10 The enhancement of hydrogen dynamics and thermodynamics properties is mainly ascribed to the abundant oxygen vacancies, as conrmed by Zhou et al 11 An abundance of oxygen vacancies can be achieved by the addition of Zr into CeO 2 . 12,13 Moreover, extensive research has revealed that the density of oxygen vacancies on transition doped Ce-Zr oxides is far better than on single Ce-Zr oxides; 14,15 O vac defects can be produced on the CeO 2 surface by Ce 3+ -Ce 4+ transfer owing to the transition metal dopant.…”