Mg alloy waste modified by (Mg10Ni)90Ce10: A green hydrolysis hydrogen production strategy

Abstract

Mg alloys hydrolysis is considered as an environmentally friendly and efficient hydrogen production method. In this work, residuary industrial Mg alloy waste (IMAW) employed in hydrolysis process is creative and meaningful to promote ‘Green hydrogen’ strategy. To explore proper hydrolysis systems and effective modification ways, various IMAW and the short-term ball-milling effect are systematically investigated. To achieve rapid initial kinetic and high hydrogen capacity, (Mg10Ni90)Ce10 (MNC) is firstly introduced to further modify AZ91D and ZK60. The microstructure evolution, thermodynamic behavior and modified mechanism are investigated to analyze the role of MNC in hydrolysis process. AZ91D and ZK60 attle after activated by MNC obtain 0.81 and 0.56 H2 yield in initial 2 min, higher than samples without MNC (0.56 and 0.04). Meanwhile, the maximum hydrogen generation rates can reach 340.9 and 262.8 mL·g−1·min−1. The hydrolysate morphologies of IMAW before and after activation are confirmed to change from dense and continuous to loose and granular, and the Ea are greatly reduced. The modified mechanism based on the micro-local temperature acceleration is proposed and elaborated. IMAW modified by MNC achieves a green and effective H2 generation process, which can pave way for portable hydrogen generators and industrial hydrogen generation system.