TY - JOUR
T1 - Release of hydrogen from nanoconfined hydrides by application of microwaves
AU - Sanz-Moral, Luis Miguel
AU - Navarrete, Alexander
AU - Sturm, Guido
AU - Link, Guido
AU - Rueda, Miriam
AU - Stefanidis, Georgios
AU - Martín, Ángel
PY - 2017
Y1 - 2017
N2 - The release of hydrogen from solid hydrides by thermolysis can be improved by nanoconfinement of the hydride in a suitable micro/mesoporous support, but the slow heat transfer by conduction through the support can be a limitation. In this work, a C/SiO2 mesoporous material has been synthesized and employed as matrix for nanoconfinement of hydrides. The matrix showed high surface area and pore volume (386 m2/g and 1.41 cm3/g), which enabled the confinement of high concentrations of hydride. Furthermore, by modification of the proportion between C and SiO2, the dielectric properties of the complex could be modified, making it susceptible to microwave heating. As with this heating method the entire sample is heated simultaneously, the heat transfer resistances associated to conduction were eliminated. To demonstrate this possibility, ethane 1,2-diaminoborane (EDAB) was embedded on the C/SiO2 matrix at concentrations ranging from 11 to 31%wt using a wet impregnation method, and a device appropriate for hydrogen release from this material by application of microwaves was designed with the aid of a numerical simulation. Hydrogen liberation tests by conventional heating and microwaves were compared, showing that by microwave heating hydrogen release can be initiated and stopped in shorter times.
AB - The release of hydrogen from solid hydrides by thermolysis can be improved by nanoconfinement of the hydride in a suitable micro/mesoporous support, but the slow heat transfer by conduction through the support can be a limitation. In this work, a C/SiO2 mesoporous material has been synthesized and employed as matrix for nanoconfinement of hydrides. The matrix showed high surface area and pore volume (386 m2/g and 1.41 cm3/g), which enabled the confinement of high concentrations of hydride. Furthermore, by modification of the proportion between C and SiO2, the dielectric properties of the complex could be modified, making it susceptible to microwave heating. As with this heating method the entire sample is heated simultaneously, the heat transfer resistances associated to conduction were eliminated. To demonstrate this possibility, ethane 1,2-diaminoborane (EDAB) was embedded on the C/SiO2 matrix at concentrations ranging from 11 to 31%wt using a wet impregnation method, and a device appropriate for hydrogen release from this material by application of microwaves was designed with the aid of a numerical simulation. Hydrogen liberation tests by conventional heating and microwaves were compared, showing that by microwave heating hydrogen release can be initiated and stopped in shorter times.
KW - Aerogel
KW - Hydride
KW - Hydrogen storage
KW - Microwave heating
KW - Supercritical CO
UR - http://resolver.tudelft.nl/uuid:22e8a815-b303-44ee-ae27-dd09a3843a07
UR - http://www.scopus.com/inward/record.url?scp=85017119522&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2017.03.110
DO - 10.1016/j.jpowsour.2017.03.110
M3 - Article
AN - SCOPUS:85017119522
SN - 0378-7753
VL - 353
SP - 131
EP - 137
JO - Journal of Power Sources
JF - Journal of Power Sources
ER -