Synergistic Catalytic Effects of Yb <sub>2</sub> O <sub>3</sub> @C, Gd <sub>2</sub> O <sub>3</sub> @C, and CeO <sub>2</sub> @C on Mg–La–Ni Alloys’ Hydrogen Storage Properties
Yb<sub>2</sub>O<sub>3</sub>@C, Gd<sub>2</sub>O<sub>3</sub>@C, and CeO<sub>2</sub>@C hybrid catalysts with porous, defect-rich structures were synthesized via a modified vaporization-carbonization method and incorporated (7 wt %) into Mg<sub>96</sub>La<sub>3</sub>Ni alloys by ball milling. Yb<sub>2</sub>O<sub>3</sub>@C increased hydrogen absorption, while Gd<sub>2</sub>O<sub>3</sub>@C and CeO<sub>2</sub>@C reduced it; all enhanced dehydrogenation, with CeO<sub>2</sub>@C most effective. At 360 °C, 3 wt % H<sub>2</sub> was released in 3.1 min for pristine Mg<sub>96</sub>La<sub>3</sub>Ni, but only 1.0, 1.9, and 2.7 min with CeO<sub>2</sub>@C, Yb<sub>2</sub>O<sub>3</sub>@C, and Gd<sub>2</sub>O<sub>3</sub>@C, respectively. CeO<sub>2</sub>@C reduced the activation energy from 121.67 to 109.78 kJ/mol. This study highlights the novelty of combining rare-earth oxides with defective carbon supports, where in situ hydrides act as "hydrogen pumps" and carbon frameworks provide nucleation sites. This synergistic strategy enhances kinetics and cycling stability without altering thermodynamics, offering new insights for Mg-based hydrogen storage alloys.
Authors
- Zongcai Zhang (ORCID: https://orcid.org/0000-0002-2897-3133)
- Fengying Zhang (ORCID: https://orcid.org/0000-0002-6891-7443)
- Jingming Liu (ORCID: https://orcid.org/0009-0004-1417-6725)
- Yue Meng
Institutions
- Shanxi University (CN)
- Jinzhong University (CN)
- Shanxi Science and Technology Department (CN)
Publication Details
- Journal
- Langmuir
- Published
- 2025-11-12
- DOI
- https://doi.org/10.1021/acs.langmuir.5c03805
- Primary Topic
- Hydrogen Storage and Materials
- Type
- article
- Field-Weighted Citation Impact
- 0.00