Catalytic effects of V and V2O5 on hydrogen storage property of Mg17Al12 alloy. (2nd August 2018)

• Record Type: Journal Article
• Authors: Wu, Huajian; Du, Jiaqi; Cai, Fangfang; Xu, Fan; Wei, Wenlou; Guo, Jin; Lan, Zhiqiang
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 31(2018)
• Page Start: 14578
• Page End: 14583
• Publication Date: 2018-08-02
• Subjects: Mg17Al12 -- Hydrogen-storage property -- Catalytic effect; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.06.066
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A Mg17 Al12 alloy was synthesized via sintering, and the catalytic effects of V and V2 O5 on the hydrogen (H2 )-storage properties of this alloy were investigated. The results revealed that the hydrogenation/dehydrogenation temperature of Mg17 Al12 decreased markedly and the reversible hydrogen storage properties improved with the addition of V or V2 O5 . For example, at 250 °C, the Mg17 Al12 alloy underwent hydrogenation only and a hydrogen absorption capacity of 2.22 wt.% was realized. However, with the addition of V and V2 O5, (i) reversible hydrogen absorption/desorption occurred, (ii) the hydrogen absorption capacity increased to 2.95 wt.% and 3.35 wt.%, and (iii) the hydrogenation/dehydrogenation enthalpy of the Mg17 Al12 alloy decreased from 65.7/83.1 kJ·mol −1 to 62.6/69.3 kJ·mol −1 and 59.9/68.1 kJ·mol −1, respectively. Highlights: The hydrogenation temperature of Mg17 Al12 alloy decreased markedly by adding V or V2 O5 . The addition of V or V2 O5 can reduce the stability of the Mg17 Al12 hydride. Both V and V2 O5 can improve reversible hydrogen storage properties of the Mg17 Al12 alloy.