Abstract
A MAX-phase carbide (Ti3AlC2) with purity 99% was synthesized by first ball milling a mixture of Ti, Al and C and subsequently sintering at 1500 °C. The catalytic effects of the as-prepared Ti3AlC2 on the hydrogen storage reaction of MgH2 were evaluated for the first time. The results indicated that the MgH2-7 wt% Ti3AlC2 sample had optimal hydrogen storage properties. The dehydrogenation onset temperature of the MgH2-7 wt% Ti3AlC2 sample decreased to 205 °C, which is 70 °C lower than that of the as-milled pristine MgH2. While heating to 340 °C, the hydrogen desorption reached 6.9 wt%. The dehydrogenated MgH2-7 wt% Ti3AlC2 sample absorbed 5.8 wt% hydrogen within 60 s at 150 °C, while the hydrogen uptake amount in dehydrogenated pristine MgH2 was only 2.7 wt%, even after 2000 s. The apparent activation energy was calculated to be 104.7 kJ/mol for the MgH2-7 wt% Ti3AlC2 sample, which is 50.4 kJ/mol lower than that of the pristine MgH2. The existence state of Ti3AlC2 during dehydrogenation was also analyzed and discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
