Improved Hydrogen Storage Kinetics of Nanoconfined NaAlH 4 Catalyzed with TiCl 3 Nanoparticles
Nielsen, TK; Polanski, M; Zasada, D; Javadian, P; Besenbacher, F; Bystrzycki, J; Skibsted, J; Jensen, TR
| HERO ID | 742662 |
|---|---|
| In Press | No |
| Year | 2011 |
| Title | Improved Hydrogen Storage Kinetics of Nanoconfined NaAlH 4 Catalyzed with TiCl 3 Nanoparticles |
| Authors | Nielsen, TK; Polanski, M; Zasada, D; Javadian, P; Besenbacher, F; Bystrzycki, J; Skibsted, J; Jensen, TR |
| Journal | ACS Nano |
| Volume | 5 |
| Issue | 5 |
| Page Numbers | 4056-4064 |
| Abstract | Nanoparticles of NaAlH(4) have been infiltrated in nanoporous carbon aerogel with TiCl(3) nanoparticles in order to explore possible synergetic effects between nanoconfinement and a functionalized catalytic scaffold. Resorcinol formaldehyde carbon aerogels with an average pore size of 17 nm and total pore volume of 1.26 mL/g were infiltrated with TiCl(3) to obtain an aerogel doped with 3.0 wt % TiCl(3) nanoparticles. NaAlH(4) was melt-infiltrated into the functionalized carbon aerogel at 189 °C and p(H(2)) ∼ 186-199 bar. Energy-dispersive spectrometry (EDS) combined with focused ion beam (FIB) techniques revealed the presence of Na, Al, Ti, and Cl inside the aerogel scaffold material. The infiltrated NaAlH(4) was X-ray amorphous, whereas (27)Al magic-angle spinning (MAS) NMR spectroscopy confirmed the presence of nanoconfined NaAlH(4). Temperature-programmed desorption mass spectroscopy (TPD-MS) and Sieverts' measurements demonstrated significantly improved hydrogen desorption kinetics for this new nanoconfined NaAlH(4)-TiCl(3) material as compared to nanoconfined NaAlH(4) without the catalysts TiCl(3) and to bulk ball-milled samples of NaAlH(4)-TiCl(3). We find that the onset temperature for hydrogen release was close to room temperature (T(onset) = 33 °C), and the hydrogen release rate reached a maximum value at 125 °C, which demonstrates favorable synergetic effects between nanoconfinement and catalyst addition. |
| Doi | 10.1021/nn200643b |
| Pmid | 21446760 |
| Wosid | WOS:000290826800077 |
| Url | http://pubs.acs.org/doi/abs/10.1021/nn200643b |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Language Text | English |
| Is Qa | No |