期刊
APPLIED SURFACE SCIENCE
卷 504, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2019.144465
关键词
Hydrogen storage; MgH2; Synergetic catalysis; Reversibility
类别
资金
- National Natural Science Foundation of China [51801078, 51702300]
- National Science Foundation of Jiangsu Province [BK20180986, 17KJB480003, SJCX19_0614]
- Zhenjiang Key Laboratory of Marine Power Equipment Performance
Transition metal nanoparticles have shown great catalytic effect on MgH2, yet excellent cyclic stability can be attached due to the addition of carbon nanotubes. In this paper, MgH2 + 10 wt% Zr0.4Ti0.6Co/5 wt% Carbon nanotubes (CNTs) composite is designed to investigate the synergistic modification of Zr0.4Ti0.6Co nanosheets and carbon nanotubes on the hydrogen storage performance of MgH2. Compared with pure MgH2, the initial hydrogen release temperature of MgH2 + 10 wt% Zr0.4Ti0.6Co /5 wt% CNTs composite decreases to 180 degrees C and the composite can quickly release 90% H-2 within 10 min at 300 degrees C. In addition, the completely dehydrogenated sample can absorb 3.51 wt% H-2 within 20 min under 3 Mpa hydrogen pressure at 125 degrees C. Ulteriorly, the activation energy values of dehydrogenation and rehydrogenation of MgH2 decrease to 70.5 +/- 7.8 kJ/mol and 35.8 +/- 3.8 kJ/mol on account of the presence of 10 wt% Zr0.4Ti0.6Co/5 wt% CNTs, which reasonably explains the remarkable reduction of the temperature for hydrogen sorption. Furthermore, the MgH2 + 10 wt% Zr0.4Ti0.6Co/5 wt% CNTs composite shows excellent cycling performance, indicative of potential application in practical hydrogen storage in the nearest future.
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