A noteworthy synergistic catalysis on hydrogen sorption kinetics of MgH2 with bimetallic oxide Sc2O3/TiO2

• Published in: Journal of alloys and compounds Vol. 839; p. 155387
• Main Authors: Huang, H.X., Yuan, J.G., Zhang, B., Zhang, J.G., Zhu, Y.F., Li, L.Q., Wu, Y.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 25.10.2020; Elsevier BV
• Subjects: Bimetallic oxides; Bimetals; Catalysis; Catalysts; Chemical synthesis; Hydrogen sorption kinetics; Hydrogen storage; Magnesium; Mg hydride; Reaction kinetics; Scandium oxides; Synergistic catalysis; Titanium dioxide; Hydrogen sorption kinetics; Synergistic catalysis; Bimetallic oxides; Mg hydride
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2020.155387

The positive effect of heterogeneous catalysis on hydrogen storage performance of magnesium hydride (MgH2) has been recognized by a large number of researchers. In the present paper, a bimetallic oxide catalyst Sc2O3/TiO2 with noteworthy synergistic catalysis is synthesized by a facile method. A significant enhancement of hydrogen storage performance is achieved when 5 wt% Sc2O3/TiO2 catalyst is added into MgH2. It absorbs 6.08 wt% H2 within 3000 s at 200 °C and releases 6.21 wt% H2 within 1000 s at 300 °C, which is far better than that of Mg/MgH2. The excellent performance is attributed to the synergistic catalysis of bimetallic oxides. The uniform distribution of Sc and Ti evidenced by EDS is beneficial to the synergistic catalytic effect on the surface of Mg particles. This study further confirms the initiative of multi-phase synergistic catalysis and provides insights for the selection and design of catalysts. •Bimetallic oxide Sc2O3/TiO2 catalyst was synthesized by sol gel and calcination methods successfully.•The addition of Sc2O3/TiO2 catalyst results in an increase of hydrogen absorption/desorption capacity.•The MgH2@5 wt%Sc2O3/TiO2 composite exhibits better hydriding/dehydriding performance compared to other samples.•The hydrogen storage properties are improved due to a synergistic catalysis of Sc2O3 and TiO2.