Facile synthesis of small MgH2 nanoparticles confined in different carbon materials for hydrogen storage

• Published in: Journal of alloys and compounds 2020-06, Vol.825, p.153953, Article 153953
• Main Authors: Zhang, Qiuyu, Huang, Yike, Ma, Tiancai, Li, Ke, Ye, Fei, Wang, Xuechao, Jiao, Lifang, Yuan, Huatang, Wang, Yijing
• Format: Article
• Language: English
• Subjects: Activated carbon; Carbon; Carbon materials; Charcoal; Composite materials; Dehydrogenation; Desorption; Differential scanning calorimetry; Hydrogen; Hydrogen storage; Hydrogenation; Hydrogenation/dehydrogenation performance; In situ synthesis; Mg-based composites; Multi wall carbon nanotubes; Nanoparticles; Solid state
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2020.153953

We introduce a facile chemical solid state method to in situ grow MgH2 nanoparticles in various carbon materials. Commercial carbon materials, containing coconut shell charcoal (CSC), multi-walled carbon nanotube (CNT), graphite (G) and activated carbon (AC) are employed as the templates. The MgH2@X (X = CSC, CNT, G and AC) composites were successfully obtained by the simple solid state method. The hydrogen storage properties of MgH2@X (X = CSC, CNT, G and AC) composites are systematically studied by temperature-programmed desorption system, isothermal de/hydrogenation apparatus and differential scanning calorimetry measurements. Experimental results reveal that the MgH2@CSC composites have the most fascinating hydrogen absorption and desorption performance, followed by MgH2@CNT, MgH2@G and MgH2@AC composites. The dehydrogenation of MgH2@CSC composites begins at 245 °C. Moreover, the MgH2@CSC composites exhibit superior de/hydrogenation kinetic performance. The composites could desorb 5.4 wt% hydrogen within 10 min at 325 °C, and the dehydrogenated composites take up 5.0 wt% hydrogen within 5 min at 250 °C under 2 MPa H2 pressure. Among the carbon materials, CSC with layered structure composed of interconnected wrinkles is most beneficial to maintain the high dispersity and nano size of MgH2 nanoparticles, resulting in the superior de/hydrogenation performance. •The MgH2 nanoparticles loaded in different carbon materials were in situ synthesized by facile chemical solid state method.•The MgH2 nanoparticles confined in coconut shell charcoal (MgH2@CSC) exhibit the most superior hydrogen storage property.•The MgH2@CSC desorbs 5.4 wt% H2 in 10 min at 325 °C, and absorb 5.0 wt% H2 in 5 min at 250 °C.