Ping Li, Yang Li and Xuanhui Qu
University of Science and Technology Beijing, China
Posters & Accepted Abstracts: J Material Sci Eng
Cast and rapid solidification Ce2Mg17 alloy were synthesized by induction furnace melting and single roll rapid solidification method. The effects of rapid solidification rate on kinetics, thermodynamics and cycling stability of Ce2Mg17 alloy and the thermal storage mechanism were investigated by XRD (X-ray diffraction), SEM (Scanning Electron Microscope) and TEM (Transmission Electron Microscope). The reaction enthalpy of Ce2Mg17 is 75.5 kJ/mol H2 and equilibrium pressure is 0.91 MPa at 400OC. The results also show that rapid solidified Ce2Mg17 alloy shows a better kinetics performance, compared to those of casted samples. As the rate of rapid solidification increases, the activation property and hydrogen capacity of Ce2Mg17 alloy are improved. XRD results show that during hydrogenation, Ce2Mg17 forms CeHx and Mg, and Mg is hydrogenated after the formation of CeHx. This disproportionation reaction is irreversible, but the Ce2Mg17 alloy after disproportionation reaction is still reversible. The amorphous structure formed in rapid solidification is in favor of CeHx decomposition. The disproportionation reaction improves anti-sintering properties and cycling stability. Ce2Mg17 system shows promise to solar power thermal energy storage.
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