Mitigation of degradation in the dehydrogenation behavior of air-exposed MgH2 catalyzed with NbF5
- Mitigation of degradation in the dehydrogenation behavior of air-exposed MgH2 catalyzed with NbF5
- 박미래; 심재혁; 이영수; 임연호; 조영환
- Hydrogen storage; Magnesium hydride; MgH2; Air exposure; NbF5; Dehydrogenation; X-ray diffraction; Ball milling; X-ray photoelectron spectroscopy; Scanning electron microscopy
- Issue Date
- Journal of alloys and compounds
- VOL 575, 393-398
- This paper addresses the dehydrogenation behavior of MgH2 exposed to air for up to 24 h at room temperature,
focusing on the effect of the addition of a small amount of NbF5 and Nb2O5 as a catalytic additive.
Although the dehydrogenation reaction of MgH2 with no catalytic additive and Nb2O5 is significantly
retarded after air exposure compared with unexposed samples, the degradation in the dehydrogenation
behavior of MgH2 with NbF5 due to air exposure is found to be effectively mitigated. Although differential
scanning calorimetry of the air-exposed samples indicates that the activation energy for the dehydrogenation
reaction significantly increases after air exposure, the activation energy for MgH2 with NbF5
remains the lowest. Scanning electron microscopy with energy dispersive X-ray spectroscopy shows that
the amount of oxygen on the surfaces of air-exposed MgH2 particles catalyzed with NbF5 is much lower
than that of air-exposed MgH2 with no catalytic additive and Nb2O5. This implies that the addition of
NbF5 forms protective layers on the surfaces of MgH2 particles against oxygen and moisture in the air,
which seems to be responsible for the positive effect of NbF5 on the degradation of the dehydrogenation
behavior of air-exposed MgH2.
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