Subject Area物理化学
Hydrogen storage over alkali metal hydride and alkali metal hydroxide composites
Yu, Pei; Chua, Yong Shen; Cao, Hujun; Xiong, Zhitao; Wu, Guotao; Chen, Ping; YongshenChua; ZhitaoXiong
KeywordHydrogen Storage Alkali Metal Hydroxide Alkali Metal Hydride Thermodynamic Kinetic
Indexed BySCI
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Applied ; Chemistry, Physical ; Energy & Fuels ; Engineering, Chemical
WOS Research AreaChemistry ; Energy & Fuels ; Engineering
AbstractAlkali metal hydroxide and hydride composite systems contain both protic (H bonded with O) and hydridic hydrogen. The interaction of these two types of hydrides produces hydrogen. The enthalpy of dehydrogenation increased with the increase of atomic number of alkali metals, i.e., -23 kJ/mol(H2) for LiOH-LiH, 55.34 kJ/mol(H2) for NaOH-NaH and 222 kJ/mol(H2) for KOH-KH. These thermodynamic calculation results were consistent with our experimental results. H-2 was released from LiOH-LiH system during ball milling. The dehydrogenation temperature of NaOH-NaH system was about 150 degrees C; whereas KOH and KH did not interact with each other during the heating process. Instead, KH decomposed by itself. In these three systems, NaOH-NaH was the only reversible hydrogen storage system, the enthalpy of dehydrogenation was about 55.65 kJ/mol(H2), and the corresponding entropy was ca. 101.23 J/(mol(H2)center dot K), so the temperature for releasing 1.0 bar H-2 was as high as 518 degrees C, showing unfavorable thermodynamic properties. The activation energy for hydrogen desorption of NaOH-NaH was found to be 57.87 kJ/mol, showing good kinetic properties.
WOS IDWOS:000340350900002
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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorYongshenChua; ZhitaoXiong
AffiliationChinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Yu, Pei,Chua, Yong Shen,Cao, Hujun,et al. Hydrogen storage over alkali metal hydride and alkali metal hydroxide composites[J]. JOURNAL OF ENERGY CHEMISTRY,2014,23(4):414-419.
APA Yu, Pei.,Chua, Yong Shen.,Cao, Hujun.,Xiong, Zhitao.,Wu, Guotao.,...&ZhitaoXiong.(2014).Hydrogen storage over alkali metal hydride and alkali metal hydroxide composites.JOURNAL OF ENERGY CHEMISTRY,23(4),414-419.
MLA Yu, Pei,et al."Hydrogen storage over alkali metal hydride and alkali metal hydroxide composites".JOURNAL OF ENERGY CHEMISTRY 23.4(2014):414-419.
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