Issue 21, 2022

Efficient catalytic effect of the page-like MnCo2O4.5 catalyst on the hydrogen storage performance of MgH2

Abstract

Binary transition metal oxides have exhibited highly excellent de/hydrogenation kinetic catalytic properties on magnesium hydride (MgH2). Thence, page-like MnCo2O4.5 nanoparticles have been synthesized to enhance the de/hydrogenation performance of MgH2. The initial dehydrogenation temperature of the MgH2-6 wt% MnCo2O4.5 composite decreases to 285 °C. Interestingly, MgH2 doped with 6 wt% MnCo2O4.5 can fully release 6.4 wt% H2 in 4 min at 325 °C. On the contrary, only 0.58 wt% of H2 is released from the undoped as-milled MgH2 in 4 min at 325 °C. Moreover, the dehydrogenated MnCo2O4.5 doped composite can absorb 4.43 wt% H2 in 30 min at 150 °C. Moreover, we found that the desorption activation energy of the composite decreases by 50.18% compared with that of the undoped as-milled MgH2. The evolution process and catalytic mechanism of MnCo2O4.5 on MgH2 were explored through the evidence of X-ray diffraction and transmission electron microscopy. It is believed that Mn-containing phases and Co-containing phases formed in situ during the dehydrogenation process can synergistically catalyze MgH2 to achieve better kinetic performance.

Graphical abstract: Efficient catalytic effect of the page-like MnCo2O4.5 catalyst on the hydrogen storage performance of MgH2

Supplementary files

Article information

Article type
Research Article
Submitted
06 Aug 2022
Accepted
07 Sep 2022
First published
08 Sep 2022

Inorg. Chem. Front., 2022,9, 5495-5506

Efficient catalytic effect of the page-like MnCo2O4.5 catalyst on the hydrogen storage performance of MgH2

S. Zhou, D. Wei, H. Wan, X. Yang, Y. Dai, Y. Chen and F. Pan, Inorg. Chem. Front., 2022, 9, 5495 DOI: 10.1039/D2QI01715F

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