Journal
CHEMICAL PHYSICS LETTERS
Volume 603, Issue -, Pages 75-81Publisher
ELSEVIER
DOI: 10.1016/j.cplett.2014.04.036
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Funding
- Swedish Foundation for Strategic Research Framework Program [RMA11-0037]
- Formas [229-2009-772]
- Swedish Research Council [2010-4041]
- Knut and Alice Wallenberg Foundation
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Hydrogen storage properties of supported Pd nanoparticles with average sizes in the range 2.7-7.6 nm were studied using indirect nanoplasmonic sensing. For each particle size, a series of isotherms was measured and, through Van't Hoff analysis, the changes in enthalpy upon hydride formation/decomposition were determined. Contrary to the expected decrease of the enthalpy, due to increasing importance of surface tension in smaller particles, we observe a very weak size dependence in the size range under consideration. We attribute this to a compensation effect due to an increased fraction of hydrogen atoms occupying energetically favorable subsurface sites in smaller nanoparticles. (C) 2014 Elsevier B.V. All rights reserved.
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