Hydrogen Adsorption Properties of Platinum Decorated Hierarchically Structured Templated Carbons

Hyunchul Oh, Thomas Gennett, Plamen Atanassov, Mert Kurttepeli, Sara Bals, Katherine E. Hurst, Michael Hirscher

Research output: Contribution to journalArticlepeer-review

26 Scopus Citations

Abstract

In this report, the possibility of Pt catalytic activity for the dissociation of hydrogen molecules and subsequent hydrogen adsorption on sucrose templated carbon at ambient temperature has been studied. In order to investigate Pt catalytic effect for hydrogen storage solely, 6.8 wt.% Pt-doped (Pt/TC) and pure templated carbon (TC) possessing almost identical specific surface area (SSA) and pore volume (Vp) have been successfully synthesized. Since both Pt/TC and TC shares for their textural properties (e.g. SSA and Vp), any difference of hydrogen adsorption characteristic and storage capacity can be ascribed to the presence of Pt nanoparticles. Both samples are characterized by various techniques such as powder X-ray diffraction, ICP-OES, Raman spectroscopy, transmission electron microscopy, cryogenic thermal desorption spectroscopy, low-pressure high-resolution hydrogen and nitrogen BET and high-pressure hydrogen adsorption isotherms in a Sieverts' apparatus. By applying hydrogen and deuterium isotope mixture, cryogenic thermal desorption spectroscopy point to a Pt catalytic activity for the dissociation of hydrogen molecules. Furthermore, the hydrogen adsorption isotherms at RT indicate an enhancement of the initial hydrogen adsorption kinetics in Pt-doped system. However, the hydrogen storage capacity of Pt/TC exhibits a negligible enhancement with a strong hysteresis, suggesting no connection between the spillover effect and a feasible hydrogen storage enhancement.

Original languageAmerican English
Pages (from-to)66-74
Number of pages9
JournalMicroporous and Mesoporous Materials
Volume177
DOIs
StatePublished - 2013

NREL Publication Number

  • NREL/JA-5900-59079

Keywords

  • Adsorption kinetics
  • Hydrogen adsorption
  • Hydrogen storage
  • Spillover

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