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- Title
NbCl and CrCl catalysts effect on synthesis and hydrogen storage performance of Mg-Ni-NiO composites.
- Authors
WAN, QI; LI, PING; WANG, TENG; QU, XUANHUI; ZHAI, FUQIANG; VOLINSKY, ALEX; LOGAN, PHILIP
- Abstract
Two kinds of novel materials, Mg-1·6 mol%Ni-0·4 mol%NiO-2 mol%MCl (MCl = NbCl, CrCl), along with Mg-1·6 mol%Ni-0·4 mol%NiO for comparison, were examined for their potential use in hydrogen storage applications, having been fabricated via cryomilling. The effects of NbCl and CrCl on hydrogen storage performance were investigated. A microstructure analysis showed that besides the main Mg and Ni phases, NiO and MgNi phases were present in all samples. MgCl was only found in halide-doped samples and NbO was only found in NbCl-doped samples after ball milling. The particle size decreased significantly after 7 h of cryomilling. MgH, MgNiH and MgNiH were present in all the samples, while NbH was only observed in the NbCl-doped sample afterabsorption. The NbCl-containing composite exhibited a low onset absorption temperature of 323 K, which was 10 K lower than that of the no-halide doped catalyst. It absorbed 5·32 wt% of hydrogen in 370 s at 623 K under 4 MPa hydrogen pressure and can absorb 90% of its full hydrogen capacity in 50 s. Having an onset desorption temperature of 483 K in vacuum, the NbCl-containing composite desorbed hydrogen faster than the no-halide doped sample. The hydriding-dehydriding kinetics performance of the CrCl-doped sample did not improve, but it did exhibit a lower onset desorption temperature of 543 K under 0·1 MPa, which was 20 K lower than that of the no-halide doped sample. NbO, NiO and NbH played important roles in improving absorption and desorption performances.
- Subjects
NIOBIUM chlorides; CHROMIUM chlorides; CHEMICAL synthesis; METAL catalysts; HYDROGEN storage; PERFORMANCE evaluation; METALLIC composites; NICKEL oxides
- Publication
Bulletin of Materials Science, 2014, Vol 37, Issue 1, p77
- ISSN
0250-4707
- Publication type
Article
- DOI
10.1007/s12034-014-0631-z