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Title: Hydrogen Uptake Kinetics of 1,4-Bis(phenylethynyl)benzene (DEB) Rubberized Coating on Silicone Foam Substrate

Abstract

The hydrogen uptake kinetics of 1,4-bis(phenylethynyl)benzene, or DEB, mixed with palladium (Pd) on activated carbon in a rubber matrix coating on top of a porous silicone foam substrate are investigated. First, isothermal isobaric hydrogenation experiments were performed under different temperatures and H2 pressures to extract the uptake kinetics. The H2 uptake models based on the measured kinetic parameters were then employed to investigate/simulate the performance of the getter under dynamic application environments. The actual hydrogenation characteristics in this type of getter is multifaceted and involve actual H2 concentration in the getter matrix, micrometer scale diffusion of atomic hydrogen away from Pd sites, precipitation of hydrogenated DEB crystals at the coating surfaces, and mobility of fresh DEB molecules. The kinetic analysis/modeling methodology described in this report can serve as a template for other gas-solid reactions as well. Aside from possessing a good hydrogen capacity and excellent performance, this type of rubberized getter also offers some unique advantages over traditional solid getter: flexible structure and protection of Pd catalyst from exposure to the environment.

Authors:
 [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1597591
Report Number(s):
LLNL-JRNL-779986
Journal ID: ISSN 1944-8244; 974697
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 12; Journal Issue: 3; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Palladium; Coating materials; Hydrogen; Hydrogenation; Silicones; Materials science

Citation Formats

Sangalang, Elizabeth A., Sharma, Hom N., Saw, Cheng K., Gollott, Rory, Matt, Sarah M., Wilson, Thomas S., McLean, William, Maxwell, Robert S., and Dinh, Long N.. Hydrogen Uptake Kinetics of 1,4-Bis(phenylethynyl)benzene (DEB) Rubberized Coating on Silicone Foam Substrate. United States: N. p., 2019. Web. https://doi.org/10.1021/acsami.9b20235.
Sangalang, Elizabeth A., Sharma, Hom N., Saw, Cheng K., Gollott, Rory, Matt, Sarah M., Wilson, Thomas S., McLean, William, Maxwell, Robert S., & Dinh, Long N.. Hydrogen Uptake Kinetics of 1,4-Bis(phenylethynyl)benzene (DEB) Rubberized Coating on Silicone Foam Substrate. United States. https://doi.org/10.1021/acsami.9b20235
Sangalang, Elizabeth A., Sharma, Hom N., Saw, Cheng K., Gollott, Rory, Matt, Sarah M., Wilson, Thomas S., McLean, William, Maxwell, Robert S., and Dinh, Long N.. Fri . "Hydrogen Uptake Kinetics of 1,4-Bis(phenylethynyl)benzene (DEB) Rubberized Coating on Silicone Foam Substrate". United States. https://doi.org/10.1021/acsami.9b20235. https://www.osti.gov/servlets/purl/1597591.
@article{osti_1597591,
title = {Hydrogen Uptake Kinetics of 1,4-Bis(phenylethynyl)benzene (DEB) Rubberized Coating on Silicone Foam Substrate},
author = {Sangalang, Elizabeth A. and Sharma, Hom N. and Saw, Cheng K. and Gollott, Rory and Matt, Sarah M. and Wilson, Thomas S. and McLean, William and Maxwell, Robert S. and Dinh, Long N.},
abstractNote = {The hydrogen uptake kinetics of 1,4-bis(phenylethynyl)benzene, or DEB, mixed with palladium (Pd) on activated carbon in a rubber matrix coating on top of a porous silicone foam substrate are investigated. First, isothermal isobaric hydrogenation experiments were performed under different temperatures and H2 pressures to extract the uptake kinetics. The H2 uptake models based on the measured kinetic parameters were then employed to investigate/simulate the performance of the getter under dynamic application environments. The actual hydrogenation characteristics in this type of getter is multifaceted and involve actual H2 concentration in the getter matrix, micrometer scale diffusion of atomic hydrogen away from Pd sites, precipitation of hydrogenated DEB crystals at the coating surfaces, and mobility of fresh DEB molecules. The kinetic analysis/modeling methodology described in this report can serve as a template for other gas-solid reactions as well. Aside from possessing a good hydrogen capacity and excellent performance, this type of rubberized getter also offers some unique advantages over traditional solid getter: flexible structure and protection of Pd catalyst from exposure to the environment.},
doi = {10.1021/acsami.9b20235},
journal = {ACS Applied Materials and Interfaces},
number = 3,
volume = 12,
place = {United States},
year = {2019},
month = {12}
}

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