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Measurements of Hydrogen Spillover in Platinum Doped Superactivated Carbon

Stadie, Nicholas P. and Purewal, Justin J. and Ahn, Channing C. and Fultz, Brent (2010) Measurements of Hydrogen Spillover in Platinum Doped Superactivated Carbon. Langmuir, 26 (19). pp. 15481-15485. ISSN 0743-7463.

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Hydrogen uptake was measured for platinum doped superactivated carbon at 296 K where hydrogen spillover was expected to occur. High pressure adsorption measurements using a Sieverts apparatus did not show an increase in gravimetric storage capacity over the unmodified superactivated carbon. Measurements of small samples (~0.2 g) over long equilibration times, consistent with the reported procedure, showed significant scatter and were not well above instrument background. In larger samples (~3 g), the hydrogen uptake was significantly above background but did not show enhancement due to spillover; total uptake scaled with the available surface area of the superactivated carbon. Any hydrogen spillover sorption was thus below the detection limit of standard volumetric gas adsorption measurements. Due to the additional mass of the catalyst nanoparticles and decreased surface area in the platinum doped system, the net effect of spillover sorption is detrimental for gravimetric density of hydrogen.

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Fultz, Brent0000-0002-6364-8782
Additional Information:© 2010 American Chemical Society. Received December 11, 2009. Revised Manuscript Received February 4, 2010. Publication Date (Web): February 26, 2010. We thank John Vajo at HRL Laboratories for providing thermogravimetric analysis data and Carol Garland for assistance with TEM work. The funding for this work was provided by the U.S. Department of Energy’s office of Energy Efficiency and Renewable Energy.
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Department of Energy (DOE)UNSPECIFIED
Issue or Number:19
Record Number:CaltechAUTHORS:20101026-093314517
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Official Citation:Measurements of Hydrogen Spillover in Platinum Doped Superactivated Carbon Nicholas P. Stadie, Justin J. Purewal, Channing C. Ahn, Brent Fultz Langmuir 2010 26 (19), 15481-15485
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20530
Deposited By: Tony Diaz
Deposited On:19 Nov 2010 23:06
Last Modified:03 Oct 2019 02:11

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