Development of 10 kW-scale hydrogen generator using chemical hydride

High volume hydrogen production from the hydrolysis of sodium borohydride using a cobalt catalyst supported on a honeycomb matrix

“…Kojima et al developed a 10 kW system using 240 g of a PteLiCoO 2 catalyst confined in a honeycomb monolith. This system was able to produce H 2 with a maximum flow of 120 L min À1 at about 110 C [41].…”

Solution Structure of Alkaline NaBH4 Solution: A sight From X-ray Scattering

“…The s·i(s) curves remain oscillated near the zero axis, showing that the diffraction experiments and data treatment processes are reliable. , and this assignment is suggested by the crystal structure data [10]; The peak at 0.24 nm is ascribed to the Na + -H 2 O interactions within the first hydration shell of hydrated Na + ions on the basis of the crystal structure of NaBH 4 •2H 2 O [10], the previous findings from X-ray diffraction [11,12], computer simulation [13]and ab initio [14], and the sum of the ionic radius of Na + (0.102 nm) and the size of a water molecule (0.14 nm); The peak at about 0.29 nm can be ascribed to the H-Bonding of bulk water [15]; The second peak at 0.34 nm arises mainly from the octahedral vertexes of hydrated Na + (cis O-O Na+ ) according to (2) 1/2 r Na-O(1) =0.340 nm; The peak at 0.35 nm may be assign to B-W(I) the interaction of the hydrated BH 4 -and the interaction of the contact ion pair (CIP) of Na + and BH 4 -, Na-Na interaction with a hydrated dimmer sodium ions; the peak at 0.396 nm is due to the interaction between octahedral vertexes and O B -H 2 O(I) interaction in the hydrated B(OH) 4 -ion. The peak around 0.43 and 0.47 nm is due to the interactions of Na-O(2) and trans O-O(Na + ), respectively.…”

“…The percentage of hydrogen present in NaBH 4 and released by hydrolysis are 10.6 and 10.8%, respectively, therefore NaBH 4 is the most attractive chemical hydride materials for H 2 generation and storage in automotive fuel cell applications [3,4]. Direct borohydride fuel cell (DBFC) technology is being actively investigated by many research groups.…”

“…Direct borohydride fuel cell (DBFC) technology is being actively investigated by many research groups. Although the DBFC was first proposed in the early 1960s [5], further progresses suffered a hiatus of about 40 years due to lack of research on the understanding of the complex electrode mechanism and electrode kinetics of the BH 4 − oxidation reaction [6]. The BH 4 -hydration especially the dihydrogen bonding in those clusters and the ion assiation may play an important in the BH 4 − electrode oxidation process.…”

“…Although the DBFC was first proposed in the early 1960s [5], further progresses suffered a hiatus of about 40 years due to lack of research on the understanding of the complex electrode mechanism and electrode kinetics of the BH 4 − oxidation reaction [6]. The BH 4 -hydration especially the dihydrogen bonding in those clusters and the ion assiation may play an important in the BH 4 − electrode oxidation process. In the present work, the time and space averaged structure of basic NaBH 4 solutions with sat/water of 1:4 and 1:8 were studied by the X-ray flat specimen cell reflectometry in Beijing SynchrotronRadiation Facility (BSRFⅡ) at 298 K. Their structural functions and difference radial distribution functions and were obtained, and the hydration structures were given through model calculation.…”