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<p>In this study, AZ31 magnesium alloy was employed as the base matrix, with 1 wt% cobalt (Co) and 1 wt% graphene (G) introduced via High-Energy Ball Milling (HEBM) to enhance hydrogen storage properties. Hydrogen absorption and desorption were systematically evaluated using a Sieverts-type apparatus at 375 °C, 350 °C, and 325 °C. The AZ31 + Co + G composite exhibited the best performance at 375 °C, achieving 6.49 wt% hydrogen capacity with significantly improved kinetics, as evidenced by its shortened absorption time of 780 s and the highest absorption rate (0.00803 wt%/s) among all samples. Graphene facilitated diffusion pathways, while cobalt catalyzed hydrogen dissociation, and their synergistic effect provided superior uptake and release compared to single additives. At 350 °C, stable storage behavior was maintained, while at 325 °C a decline in capacity was observed. These results confirm that dual Co and graphene doping offers complementary benefits, establishing AZ31 alloy as a promising candidate for medium- to high-temperature hydrogen storage applications.</p> Graphical Abstract <p></p>

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The synergistic effect of cobalt and graphene on the hydrogen storage performance of AZ31 alloy

  • 期刊论文

  • 发表日期：

    2025年12月16日

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  • Song-Jeng Huang,
  • Yu-Ping Lin,
  • Biniyam Tizazu Abraham,
  • Sathiyalingam Kannaiyan

摘要

In this study, AZ31 magnesium alloy was employed as the base matrix, with 1 wt% cobalt (Co) and 1 wt% graphene (G) introduced via High-Energy Ball Milling (HEBM) to enhance hydrogen storage properties. Hydrogen absorption and desorption were systematically evaluated using a Sieverts-type apparatus at 375 °C, 350 °C, and 325 °C. The AZ31 + Co + G composite exhibited the best performance at 375 °C, achieving 6.49 wt% hydrogen capacity with significantly improved kinetics, as evidenced by its shortened absorption time of 780 s and the highest absorption rate (0.00803 wt%/s) among all samples. Graphene facilitated diffusion pathways, while cobalt catalyzed hydrogen dissociation, and their synergistic effect provided superior uptake and release compared to single additives. At 350 °C, stable storage behavior was maintained, while at 325 °C a decline in capacity was observed. These results confirm that dual Co and graphene doping offers complementary benefits, establishing AZ31 alloy as a promising candidate for medium- to high-temperature hydrogen storage applications.

Graphical Abstract