Hydrogen sorption properties of nanocrystalline Mg2FeH6-based complex and catalytic effect of TiO2
- 67 Downloads
The diversities of hydrogen sorption properties of Mg2FeH6-based complexes with and without TiO2 were investigated. Mg2FeH6-based complexes with and without TiO2 were synthesized respectively by reactive mechanical alloying, and hydrogen sorption properties of the complexes were examined by Sieverts-type apparatus. The results show that the sample without TiO2 releases 4.43 % (mass fraction) hydrogen in 1.5 ks at 653 K under 0.1 MPa H2 pressure and absorbs 90% of the total 4.43 % (mass fraction) hydrogen absorbed in 85 s at 623 K under 4.0 MPa H2 pressure. But for the sample with TiO2 addition under the same condition, it only needs 400 s to release all of the stored hydrogen and 60 s to absorb 90% of the total hydrogen absorbed. The activation energies for desorption process of the samples with and without TiO2 are determined to be 71.2 and 80.3 kJ/(mol·K), respectively. The improvement in hydrogen sorption rate and and reduction in activation energy can be attributed to the addition of TiO2.
Key wordsMg-based hydrogen storage materials reactive mechanical alloying hydrogen sorption properties kinetics activation energy
Unable to display preview. Download preview PDF.
- SAI R S S, DAVIDSON D J, BOBET J L, SRIVASTAVA O N. Investigations on the synthesis, structural and microstructural characterizations of Mg-based K2PtCl6 type (Mg2FeH6) hydrogen storage material prepared by mechanical alloying[J]. Journal of Alloys and Compounds, 2002, 333: 282–290.CrossRefGoogle Scholar
- LI S L, LIU Y, VARIN R A, LIU H F, CUI J M, CHEN S Q. Effect of ball milling methods on synthesis and desorption properties of nanocrystalline Mg2FeH6 hydrogen storage materials[J]. The Chinese Journal of Nonferrous Metals, 2008, 18(1): 42–47. (in Chinese).Google Scholar
- LI Song-lin, LIU Yi, CUI Jian-min, YANG Wen-zhi, LI Hao-peng, HE Yi-lun. Synthesis and hydrogen desorption properties of Mg2FeH6 hydrogen storage material by reactive mechanical alloying[J]. Journal of Central South University: Science and Technology, 2008, 39(1): 1–6. (in Chinese).CrossRefGoogle Scholar
- WANG Er-de, LEI Zheng-long, YU Zhen-xing. A review on the development of Mg-based hydrogen storage materials[J]. Powder Metallurgy Technology, 2003, 21(1): 31–36. (in Chinese)Google Scholar
- YU Zhen-xing, WANG Er-de, ZHANG Wen-cong, FANG Wen-bin, SUN Hong-fei, LIANG Ji. Shell and shrinking core kinetics model of Mg-based hydrogen storage alloys[J]. Trans Nonferrous Met Soc China, 2005, 15(1): 178–182.Google Scholar
- HU Lian-xi, WANG Er-de. Hydrogen generation via hydrolysis of nanocrystalline MgH2 and MgH2-based composites[J]. Trans Nonferrous Met Soc China, 2005, 15(5): 965–970.Google Scholar
- PENG Neng, LIANG Zhen-feng, XIAO Fang-ming, WANG Ying, LU Qi-yun, TANG Ren-heng. Study on nanocrystalline rare earth Mg-based system hydrogen storage alloys with AB3-type[J]. Materials Research and Application, 2007, 1(1): 23–36. (in Chinese).Google Scholar