A novel AlGa@Gr material for ultrasound enhanced hydrogen generation. (16th November 2021)

• Record Type: Journal Article
• Authors: Huang, Haijun; Shu, Da
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 79(2021)
• Page Start: 39499
• Page End: 39508
• Publication Date: 2021-11-16
• Subjects: Hydrogen production -- Al-water reaction -- Ultrasonic irradiation -- Graphene; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.09.143
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A novel Al10Ga@5Gr material characterized by micron-sized Al(Ga) solid-solution laminar particles covered by graphene (Gr) was fabricated and then hydrolyzed in a ultrasound accelerated mode as instructed by a new integral idea to obtain high activity-preserved materials and achieve high-rate-persisted hydrogen productions. The results show that the Gr cover not only plays an anti-oxidation role to maintain the hydrolysis activity, but accelerates hydrolysis due to a corrosive micro-galvanic cell effect; ultrasound helps to peel off the surficial Gr and the by-products to maintain a high hydrogen generation rate and hydrogen yield. This work demonstrates that the combination of AlGa@Gr material and ultrasound enhanced hydrolysis is an effective method to break the activation and deactivation tradeoff of aluminum-based hydrolyzing materials. Graphical abstract: Image 1 Highlights: A novel material is designed and fabricated. A sustained and exhaustive aluminum-water reaction was achieved. Graphene (Gr) and ultrasound were incorporated in hydrolysis. The hydrolyzing process was in-situ studied by high-speed photography. The enhanced mechanism of hydrolysis was addressed and schematically delineated.