Abstract
Al-based alloy ingots are a highly promising material for on-demand hydrogen supply. However, the use of Sn in them restricts the recovery and reuse of alloying elements, and also decreases the purity of byproducts, resulting in a significant increase in the application cost. Herein, a series of Sn-free ternary Al-alloys are prepared and their hydrogen production performance are investigated. Experimental results indicate that the Sn-free Al-Ga-In alloys maintain good hydrogen production performance, and the hydrolysis reaction is more stable and sustained than that of Al-Ga-In-Sn alloys. As the optimized formula, the 94Al-4.73Ga-1.27In alloy exhibits a high hydrogen conversion efficiency of 97.3% and an extremely stable average hydrogen production rate of 0.01423 L/min at 50 °C. In addition, a semi-coherent phase boundary-derived activation mechanism during Al hydrolysis was proposed. This study opens up a prospect for the development and large-scale using of recyclable Al-based on-demand hydrogen supply materials.
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