Abstract
Magnesium hydride has been regarded as a promising hydrogen storage material. However, its further commercialization is severely hampered by its stable thermodynamic and sluggish kinetic performance. Herein, to simultaneously solve above two problems, a bimetallic oxide Ni3(VO4)2has been synthesized and applied to catalyze the hydrogen storage reaction of MgH2. Benefiting from the formation of the Mg2Ni alloy, as well as kinetic modulation of V, the dehydrogenation temperature decreased to 210 °C, with a promising rehydrogenation capacity of 2.3 wt% near room temperature. X-ray absorption spectroscopy was employed to comprehensively reveal local structures of Ni and V in different states, with the detection of NiV2O4intermediate active species for the first time. This work not only elucidates the structure evolution of the Ni3(VO4)2catalyst, but also clarifies the synergistic effect between Ni and V, which sheds light on further rational designs for multi-element metallic catalysts.
| Original language | English |
|---|---|
| Pages (from-to) | 8341-8349 |
| Number of pages | 9 |
| Journal | Journal of Materials Chemistry A |
| Volume | 9 |
| Issue number | 13 |
| DOIs | |
| State | Published - Apr 7 2021 |
| Externally published | Yes |
Funding
The authors gratefully acknowledge the nancial supports by the National Key Research and Development Program of China (No. 2018YFB1502105), the National Natural Science Foundation of China (No. 52071086, 52071083 and 51922031), the National Major Scientic Research Equipment of China (No. 51727801) and the Science and Technology Commission of Shanghai Municipality (No. 20ZR1405400). The authors would like to thank the XAFS beamline (BL14W1 and BL15U1) at Shanghai Synchrotron Radiation Facility (SSRF, China) for their supports in the experiment.