TY - JOUR
T1 - Fundamental Study on Mechanisms of Thermal Decomposition and Oxidation of Aluminum Hydride
AU - Feng, Muye
AU - Li, Heping
AU - Mao, Qian
AU - Luo, Kai H.
AU - Hellier, Paul
N1 - Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/10/10
Y1 - 2019/10/10
N2 - Aluminum hydride (AlH3) has great potential for a variety of propulsion and energy-storage applications. In this study, the ReaxFF reactive force field molecular dynamics simulation is employed to investigate the fundamental reaction mechanisms of thermal decomposition and oxidation of AlH3. The effects of an oxide layer and/or defect are examined, and the detailed process and mechanism of H2 and H2O formation are illustrated. With the presence of an oxide layer, H2 production of core-shell AlH3 during the thermal decomposition is slower than that of bare AlH3. As far as oxidation is concerned, any defect enhances the initiation of core-shell AlH3 oxidation and accelerates the oxidation at the early stage of the reaction. Additionally, the presence of O2 promotes the production of OH. Both thermal decomposition and oxidation of core-shell AlH3 show significant H2O production, and H2O is preferentially formed compared with H2 at the beginning of the reaction. The results reveal that the structural evolution of core-shell AlH3 during the thermal decomposition and oxidation proceeds in three distinctive stages, respectively. It is found that during the oxidation, dehydrogenation and oxidation proceed simultaneously although the oxidation rate is limited during the dehydrogenation period.
AB - Aluminum hydride (AlH3) has great potential for a variety of propulsion and energy-storage applications. In this study, the ReaxFF reactive force field molecular dynamics simulation is employed to investigate the fundamental reaction mechanisms of thermal decomposition and oxidation of AlH3. The effects of an oxide layer and/or defect are examined, and the detailed process and mechanism of H2 and H2O formation are illustrated. With the presence of an oxide layer, H2 production of core-shell AlH3 during the thermal decomposition is slower than that of bare AlH3. As far as oxidation is concerned, any defect enhances the initiation of core-shell AlH3 oxidation and accelerates the oxidation at the early stage of the reaction. Additionally, the presence of O2 promotes the production of OH. Both thermal decomposition and oxidation of core-shell AlH3 show significant H2O production, and H2O is preferentially formed compared with H2 at the beginning of the reaction. The results reveal that the structural evolution of core-shell AlH3 during the thermal decomposition and oxidation proceeds in three distinctive stages, respectively. It is found that during the oxidation, dehydrogenation and oxidation proceed simultaneously although the oxidation rate is limited during the dehydrogenation period.
UR - http://www.scopus.com/inward/record.url?scp=85072963264&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.9b07118
DO - 10.1021/acs.jpcc.9b07118
M3 - Article
AN - SCOPUS:85072963264
SN - 1932-7447
VL - 123
SP - 24436
EP - 24445
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 40
ER -