Hydrogen spillover effect of pt-doped activated carbon studied by inelastic neutron scattering

Cheng Si Tsao, Yun Liu, Haw Yeu Chuang, Huan Hsiung Tseng, Tsan Yao Chen, Chien Hung Chen, Ming Sheng Yu, Qixiu Li, Angela Lueking, Sow Hsin Chen

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40 Scopus citations

Abstract

We employed the inelastic neutron scattering (INS) method to directly monitor the change of molecular hydrogen in the Pt-doped activated carbon (Pt/AC) samples and provide very conclusive evidence that significant hydrogen atoms can diffuse to the carbon surface at room temperature during the spillover process. The INS method is uniquely capable of revealing the state of the hydrogen (either the atomic or molecular form). The INS result shows a direct quantitative evaluation of the amount of hydrogen adsorbed on AC in an atomic form via spillover. Two Pt/AC samples with different spillover effects were studied herein. The spillover behavior related to dissociation, diffusion, and adsorption of hydrogen in the Pt/AC samples at the temperature cycling from 4 up to 300 K was investigated by this INS study. The present study proposes the concept of diffusion length and hydrogen-rich domain around a Pt cluster center in this system based on INS data.

Original languageEnglish (US)
Pages (from-to)2322-2325
Number of pages4
JournalJournal of Physical Chemistry Letters
Volume2
Issue number18
DOIs
StatePublished - Sep 15 2011

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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