期刊
CARBON
卷 50, 期 13, 页码 4953-4964出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2012.06.028
关键词
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资金
- Office of Energy Efficiency and Renewable Energy (EERE) through the Hydrogen Sorption Center of Excellence
- Division of Materials Sciences and Engineering, Office of Basic Energy Sciences at DOE
- EERE Center of Excellence on Hydrogen Sorption Center of Excellence
- independent research at the Center for Nanophase Materials Sciences and SHaRE User Facility, Division of Scientific User Facilities, DOE-BES
- US Department of Energy [DE-AC05-00OR22725]
The catalytic dissociation of hydrogen molecules by metal nanoparticles and spillover of atomic hydrogen onto various supports is a well-established phenomenon in catalysis. However, the mechanisms by which metal catalyst nanoparticles can assist in enhanced hydrogen storage on high-surface area supports are still under debate. Experimental measurements of metal-assisted hydrogen storage have been hampered by inaccurate estimation of atomically stored hydrogen deduced from comparative measurements between metal-decorated and undecorated samples. Here we report a temperature cycling technique combined with inelastic neutron scattering (INS) measurements of quantum rotational transitions of molecular H-2 to more accurately quantify adsorbed hydrogen aided by catalytic particles using single samples. Temperature cycling measurements on single-wall carbon nanohorns (SWCNHs) decorated with 2-3 nm Pt nanoparticles showed 0.17% mass fraction of metal-assisted hydrogen storage (at approximate to 0.5 MPa) at room temperature. Temperature cycling of Pt-decorated SWCNHs using a Sievert's apparatus also indicated metal-assisted hydrogen adsorption of approximate to 0.08% mass fraction at 5 MPa at room temperature. No additional metal-assisted hydrogen storage was observed in SWCNH samples without Pt nanoparticles cycled to room temperature. The possible formation of C-H bonds due to spilled-over atomic hydrogen was also investigated using both INS and density functional theory calculations. (C) 2012 Elsevier Ltd. All rights reserved.
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