Effects of Bi composition on microstructure and Al-water reactivity of Al-rich alloys with low-In. (14th June 2018)

• Record Type: Journal Article
• Authors: An, Qi; Hu, Hongyu; Li, Nan; Liu, Dan; Xu, Shaonan; Liu, Zhou; Wei, Cundi; Luo, Feng; Xia, Maosheng; Gao, Qian
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 24(2018)
• Page Start: 10887
• Page End: 10895
• Publication Date: 2018-06-14
• Subjects: Al-rich alloy -- Low-In -- Bi-bearing -- Intermetallic compounds -- Hydrogen generation performance; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.05.009
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Bi-bearing Al-Ga-In-Sn quinary alloys were prepared by a high-temperature melting technique. The alloys primarily consist of Al(Ga) matrix and Ga, In, Sn, Bi (GISB) grain boundary phase, mainly in the form of Ga-InSn4 -InBi. The microstructure of GISB particles was obviously equiaxed with the increasing Bi dosage. Al-water reaction was tested at 40 °C. Owing to the Bi-doping, the hydrogen generation yields of alloys with InSn4 intermetallic compound are obviously improved and hydrogen release rates gradually tend to be stable, which show great potential in applications. At the dosage of 2.53 wt% Bi, the hydrogen generation performance of alloys was more prominent in Al-water reaction, including a theoretical hydrogen generation yield and hydrogen released extremum rate to ∼0.076 L/min·g Al alloy. Furthermore, the Al-water reaction mechanism of Bi-bearing Al-rich low-In quinary alloys has been put forward. Highlight: Doping of Bi improves the H2 generation performance of alloys with InSn4 . Bi composition induces the equiaxed growth of GISB particles in grain boundary. The Bi dosage affects the quantity of active sites on the Al surface. GISB particles are vital to initiate Al-water reaction instead of GIS eutectic. The alloy with 2.53 wt% Bi has great potential for on-line hydrogen supply.