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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Zhu, Delong Zhang, Jiguang Zang, Xiaoxian Huan, Qingqing Li, Liquan Zhu, Yunfeng Su, Wei |
| Copyright Year | 2016 |
| Abstract | Magnesium hydride is considered as an ideal candidate for effective hydrogen storage due to its high gravimetric hydrogen capacity and accessibility. But its use as a commercial material is hindered by its relatively high operating temperatures and slow release/uptake kinetics. To solve this, we first synthesized Ni decorated graphene nanoplate (Ni/Gn) catalysts with highly dispersed metal nano-particles (NPs) via a facile method, then the as-prepared Ni/Gn catalysts were introduced by using the hydriding combustion synthesis and mechanical milling (HCS + MM) method to obtain Mg-based composites. Remarkable enhancement of hydrogen sorption rates has been found for these composites in the presence of Ni/Gn additives, especially for the Mg@Ni8Gn2 sample: a hydrogen absorption amount of 6.28 wt% within 100 s at 373 K and a hydrogen desorption amount of 5.73 wt% within 1800 s at 523 K. A rather low activation energy (71.8 kJ mol−1) for the dehydrogenation of MgH2 was determined in the same sample, indicating that relatively moderate temperatures are required to absorb/desorb hydrogen. The excellent hydrogen sorption rates of the composites are thought to be associated with the high dispersity of in situ formed nanometric Mg2NiH4 particles during the HCS + MM process. In addition, a microstrain-induced synergetic hydrogen sorption mechanism is proposed, being correlated by the local introduction of a Mg2Ni nano-catalyst into the Mg matrix. |
| Starting Page | 2560 |
| Ending Page | 2570 |
| Page Count | 11 |
| File Format | HTM / HTML PDF |
| ISSN | 20507488 |
| Volume Number | 4 |
| Issue Number | 7 |
| Journal | Journal of Materials Chemistry A |
| DOI | 10.1039/c5ta09848c |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Magnesium Hydride Hydrogen storage Graphene Sorption Activation energy Dehydrogenation Composite material |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Renewable Energy, Sustainability and the Environment Materials Science |
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