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

Effects of doping and headshot microstructural variables on hydrogen generated via aluminum- water reactions enabled by a liquid metal Dr. Laureen Meroueh Prof. Douglas P. Hart Hatsopoulos Microfluids Laboratory, Mechanical Engineering, MIT Contact: Laureen.Meroueh@alchemr.com Advanced Chemicals & Fuels For attendees: during review of the presentation, please direct comments to the presenter by using “@PresenterName”. This will ensure they receive your comments and questions directly. Laureen Meroueh 1

THE ALUMINUM-WATER REACTION CAN GENERATE HYDROGEN ON-SITE, ON-DEMAND 2Al + 6H 2 O → 2Al(OH) 3 + 3H 2 + Q kWh → 10x H 2 (g) storage 22 L 2Al + 4H 2 O → 2AlO(OH) + 3H 2 + Q’ 0.81 mm Laureen Meroueh 2

SCRAP AL CONTAIN ALLOYING ELEMENTS THAT LEAD TO UNPREDICTABLE BEHAVIOR IN AL-WATER REACTION Need for understanding rather trial and error Laureen Meroueh 3

INVESTIGATION OF DOPING AND GRAIN SIZE EFFECTS Most scrap aluminum contains alloying elements and has undergone cold-rolling • Doping • Silicon • Magnesium • Mg 2 Si • Grain Size • As-cast • Cold-rolling Laureen Meroueh 4

RESULTS & PRACTICAL IMPLICATIONS OF THIS WORK Aluminum doping and grain size reduction allows for tailoring hydrogen output characteristics according to target application 5

References 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. 6