Achieving Wide-Temperature-Range Physical and Chemical Hydrogen Sorption in a Structural Optimized Mg/N-Doped Porous Carbon Nanocomposite
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| Publicado en: | Nano-Micro Letters vol. 18, no. 1 (Dec 2026), p. 94 |
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| Autor principal: | |
| Otros Autores: | , , , , , , |
| Publicado: |
Springer Nature B.V.
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| Materias: | |
| Acceso en línea: | Citation/Abstract Full Text Full Text - PDF |
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| Resumen: | Highlights<list list-type="bullet"><list-item></list-item>The as-synthesized rN-pC exhibited H2 uptake of ~0.9 wt% at 77 K and ultralow pressure of ~0.1 bar, with an isosteric adsorption enthalpy (Qst) of ~14 kJ mol-1 H2 at zero coverage.<list-item>The 60MgH2@rN-pC started to decompose at 175 °C and released H2 of 3.38 wt% at 300 °C within 30 min, which showed outstanding desorption kinetics of MgH2 among Mg-carbon material nanocomposites.</list-item><list-item>The drawback of nanoconfinement scaffolds that cannot store hydrogen was firstly overcome.</list-item>Nanoconfinement is a promising approach to simultaneously enhance the thermodynamics, kinetics, and cycling stability of hydrogen storage materials. The introduction of supporting scaffolds usually causes a reduction in the total hydrogen storage capacity due to “dead weight.” Here, we synthesize an optimized N-doped porous carbon (rN-pC) without heavy metal as supporting scaffold to confine Mg/MgH2 nanoparticles (Mg/MgH2@rN-pC). rN-pC with 60 wt% loading capacity of Mg (denoted as 60 Mg@rN-pC) can adsorb and desorb 0.62 wt% H2 on the rN-pC scaffold. The nanoconfined MgH2 can be chemically dehydrided at 175 °C, providing ~ 3.59 wt% H2 with fast kinetics (fully dehydrogenated at 300 °C within 15 min). This study presents the first realization of nanoconfined Mg-based system with adsorption-active scaffolds. Besides, the nanoconfined MgH2 formation enthalpy is reduced to ~ 68 kJ mol−1 H2 from ~ 75 kJ mol−1 H2 for pure MgH2. The composite can be also compressed to nanostructured pellets, with volumetric H2 density reaching 33.4 g L−1 after 500 MPa compression pressure, which surpasses the 24 g L−1 volumetric capacity of 350 bar compressed H2. Our approach can be implemented to the design of hybrid H2 storage materials with enhanced capacity and desorption rate. |
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| ISSN: | 2311-6706 2150-5551 |
| DOI: | 10.1007/s40820-025-01931-w |
| Fuente: | Materials Science Database |