Hydrogen Spillover Effect of Pt-Doped Activated Carbon Studied by Inelastic Neutron Scattering

Published

August 24, 2011

Author(s)

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

Abstract

We employed 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. INS method is uniquely capable of revealing the state of the hydrogen (either atomic or molecular forms). 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 effect were studied herein. The spillover behavior related to disassociate, diffusion and adsorption of hydrogen in the Pt/AC samples at the temperature cycling from 4 K 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.

Citation

Journal of Physical Chemistry Letters

Volume

2

Pub Type

Journals

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Keywords

inelastic neutron scattering, hydrogen spillover, activated carbon, hydrogen storage, Pt catalyst.

Citation

Tsao, C. , Liu, Y. , Chuang, H. , Tseng, H. , Chen, T. , Chen, C. , Yu, M. , Li, Q. , Lueking, A. and Chen, S. (2011), Hydrogen Spillover Effect of Pt-Doped Activated Carbon Studied by Inelastic Neutron Scattering, Journal of Physical Chemistry Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=909341 (Accessed December 15, 2024)