Assisting molybdenum trioxide catalysis by engineering oxygen vacancy for enhancing hydrogen storage performance of magnesium hydride

Haiguang Gao, Mengcheng Song, Baozhou Zhao, Jiangchuan Liu, Rui Shi, Yana Liu, Xiaohui Hu, Yunfeng Zhu

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Magnesium hydride (MgH2) as an ideal hydrogen storage carrier whose hydrogen storage performance can be effectively improved by transition metal-based catalysts. To construct highly active catalysts, much attention has been paid to the regulation of transition metal components while less attention has been paid to non-transition metal components especially oxygen, leading certain limitations. Herein, further improved hydrogen storage performance of MgH2 can be obtained by adjusting oxygen vacancy content in molybdenum trioxide (MoO3) catalyst. Specifically, compared with pure MgH2 (1.1 wt%) and MgH2-10 wt% MoO3 (4.5 wt%), more hydrogen (5.9 wt%) can be released by MgH2-10 wt% MoO3-x (MoO3 with abundant oxygen vacancies) at 300.0 °C within 499.0 s. Besides, superb capacity retention (6.1 wt%, 99.0 %) after 50 isothermal hydrogen ab/desorption cycles can be obtained for MgH2-10 wt% MoO3-x. Through rigorous comparative experiments and theoretical calculations, the excellent catalytic activity of MoO3-x is demonstrated to come from the abundant oxygen vacancies and the active substances (polyvalent Mo and nano-sized MgO) it assists to form during ball milling process. This work verifies the feasibility for further improving the catalytic activity of transition metal-based catalysts by tuning non-transition metal elements and thus provides a new strategy in catalyzed MgH2 system.

Original languageEnglish
Pages (from-to)343-352
Number of pages10
JournalJournal of Colloid and Interface Science
Volume678
DOIs
StatePublished - 15 Jan 2025

Keywords

  • Catalyst
  • Hydrogen storage materials
  • Magnesium hydride
  • Oxygen vacancy

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