Catalytic De/Hydrogenation in Mg by Co-Doped Ni and VOx on Active Carbon: Extremely Fast Kinetics at Low Temperatures and High Hydrogen Capacity
✍ Scribed by Yi Jia; Lina Cheng; Nan Pan; Jin Zou; Gaoqing (Max) Lu; Xiangdong Yao
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 790 KB
- Volume
- 1
- Category
- Article
- ISSN
- 1614-6832
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✦ Synopsis
Abstract
A multi‐component catalyst Ni‐VO~x~/AC (VO~x~ is comprised of V~2~O~5~ and VO~2~, x = 2.18) was synthesized by a wet impregnation method. The synthesized Ni‐VO~x~/AC shows a superior catalytic effect on de/hydrogenation of Mg. The MgH~2~+Ni‐VO~x~/AC composites can absorb 6.2 wt.‐% hydrogen within only 1 min at 150 °C under a hydrogen pressure of 2 MPa and desorb 6.5 wt.‐% hydrogen within 10 min at 300 °C under an initial hydrogen pressure of 1 KPa, which overcomes a critical barrier for practical use of Mg as a hydrogen storage material. A significant decrease of activation energy (E~a~) indicates that Ni‐VO~x~/AC catalyst is highly efficient for Mg de/hydrogenation, which may be ascribed to the synergistic effect of bimetals (metal oxides) and nanocarbon.