Effects of doping and headshot microstructural variables on - - PowerPoint PPT Presentation

• Dr. Laureen Meroueh
• Prof. Douglas P. Hart

Hatsopoulos Microfluids Laboratory, Mechanical Engineering, MIT Contact: Laureen.Meroueh@alchemr.com Advanced Chemicals & Fuels

Effects of doping and microstructural variables on hydrogen generated via aluminum- water reactions enabled by a liquid metal

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Laureen Meroueh 1

THE ALUMINUM-WATER REACTION CAN GENERATE HYDROGEN ON-SITE, ON-DEMAND

Laureen Meroueh 2

2Al + 6H2O → 2Al(OH)3 + 3H2 + Q 2Al + 4H2O → 2AlO(OH) + 3H2 + Q’ 22

kWh L

→ 10x H2(g) storage

0.81 mm

SCRAP AL CONTAIN ALLOYING ELEMENTS THAT LEAD TO UNPREDICTABLE BEHAVIOR IN AL-WATER REACTION

Laureen Meroueh 3

Need for understanding rather trial and error

INVESTIGATION OF DOPING AND GRAIN SIZE EFFECTS

Laureen Meroueh 4

• Doping
• Silicon
• Magnesium
• Mg2Si
• Grain Size
• As-cast
• Cold-rolling

Most scrap aluminum contains alloying elements and has undergone cold-rolling

RESULTS & PRACTICAL IMPLICATIONS OF THIS WORK

5

Aluminum doping and grain size reduction allows for tailoring hydrogen output characteristics according to target application

References

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Meroueh, L., Eagar, T. W., Hart, D.P., (2020). Leveraging grain size effects on hydrogen generated via doped aluminum-water reactions enabled by a liquid metal. Under Review Meroueh, L., Eagar, T. W., Hart, D.P., (2020). Effects of Mg and Si Doping on Hydrogen Generation via Reduction of Aluminum Alloys in Water. ACS Appl. Energy Mater. 2020, 3, 2, 1860–1868 Xu, S., Yang, X.-H., Tang, S.-S. & Liu, J. Liquid metal activated hydrogen production from waste aluminum for power supply and its life cycle assessment. International Journal of Hydrogen Energy 44, 17505–17514 (2019). Ilyukhina, A. V, Kravchenko, O. V, & Bulychev, B. M. (2017). Studies on microstructure of activated aluminum and its hydrogen generation properties in aluminum/water reaction. Journal of Alloys and Compounds, 690, 321–329. Ilyukhina, A. V, Kravchenko, O. V, Bulychev, B. M., & Shkolnikov, E. I. (2010). Mechanochemical activation of aluminum with gallams for hydrogen evolution from water. International Journal of Hydrogen Energy, 35(5), 1905–1910.