Abstract
NaAlH4 doped with ∼ 2% titanium is a promising hydrogen storage material. Density Functional Theory was used to understand the multi-step hydrogen absorption-desorption cycle. The critical issue that remains unanswered from the experimental results is how Ti catalyzes hydrogen storage. Different existing experimental results were tested on two model surfaces: one, by replacing sodium by titanium on the NaH surface and the other, by forming a surface Ti-Al alloy. Large-scale computations using the RPBE functional were performed to follow the hydrogen loading reaction starting from the depleted material (NaH and Al) to the fully hydrogen enriched NaAlH4. NaH {001} surface doped with Ti promoted exothermic dissociative absorption of molecular hydrogen, explaining the reported use of nanometric NaH doped with Ti as hydrogenation catalyst. Ways of removing the kinetic bottlenecks in the intermediate perovskite phase (Na3AlH6) are also suggested to facilitate faster cycling of hydrogen. This is an abstract of a paper presented at the 228th ACS National Meeting (Philadelphia, PA, 8/22-26/2004).
| Original language | English |
|---|---|
| Title of host publication | ACS National Meeting Book of Abstracts |
| Volume | 228 |
| Edition | 1 |
| Publication status | Published - 2004 |
| Event | Abstracts of Papers - 228th ACS National Meeting - Philadelphia, PA, United States Duration: Aug 22 2004 → Aug 26 2004 |
Other
| Other | Abstracts of Papers - 228th ACS National Meeting |
|---|---|
| Country | United States |
| City | Philadelphia, PA |
| Period | 8/22/04 → 8/26/04 |
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ASJC Scopus subject areas
- Chemistry(all)
Cite this
Density functional theory analysis of Ti-catalyzed hydrogen storage reaction on surfaces and nanoparticles of NaAlH4 and its intermediates. / Chaudhuri, Santanu; Liu, Ping; Muckerman, James.
ACS National Meeting Book of Abstracts. Vol. 228 1. ed. 2004.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Density functional theory analysis of Ti-catalyzed hydrogen storage reaction on surfaces and nanoparticles of NaAlH4 and its intermediates
AU - Chaudhuri, Santanu
AU - Liu, Ping
AU - Muckerman, James
PY - 2004
Y1 - 2004
N2 - NaAlH4 doped with ∼ 2% titanium is a promising hydrogen storage material. Density Functional Theory was used to understand the multi-step hydrogen absorption-desorption cycle. The critical issue that remains unanswered from the experimental results is how Ti catalyzes hydrogen storage. Different existing experimental results were tested on two model surfaces: one, by replacing sodium by titanium on the NaH surface and the other, by forming a surface Ti-Al alloy. Large-scale computations using the RPBE functional were performed to follow the hydrogen loading reaction starting from the depleted material (NaH and Al) to the fully hydrogen enriched NaAlH4. NaH {001} surface doped with Ti promoted exothermic dissociative absorption of molecular hydrogen, explaining the reported use of nanometric NaH doped with Ti as hydrogenation catalyst. Ways of removing the kinetic bottlenecks in the intermediate perovskite phase (Na3AlH6) are also suggested to facilitate faster cycling of hydrogen. This is an abstract of a paper presented at the 228th ACS National Meeting (Philadelphia, PA, 8/22-26/2004).
AB - NaAlH4 doped with ∼ 2% titanium is a promising hydrogen storage material. Density Functional Theory was used to understand the multi-step hydrogen absorption-desorption cycle. The critical issue that remains unanswered from the experimental results is how Ti catalyzes hydrogen storage. Different existing experimental results were tested on two model surfaces: one, by replacing sodium by titanium on the NaH surface and the other, by forming a surface Ti-Al alloy. Large-scale computations using the RPBE functional were performed to follow the hydrogen loading reaction starting from the depleted material (NaH and Al) to the fully hydrogen enriched NaAlH4. NaH {001} surface doped with Ti promoted exothermic dissociative absorption of molecular hydrogen, explaining the reported use of nanometric NaH doped with Ti as hydrogenation catalyst. Ways of removing the kinetic bottlenecks in the intermediate perovskite phase (Na3AlH6) are also suggested to facilitate faster cycling of hydrogen. This is an abstract of a paper presented at the 228th ACS National Meeting (Philadelphia, PA, 8/22-26/2004).
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M3 - Conference contribution
VL - 228
BT - ACS National Meeting Book of Abstracts
ER -