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Title: Sintering of Mixed-Conducting Composites for Hydrogen Membranes From Nanoscale Co-Synthesized Powders

Abstract

The potential for highly selective, nongalvanic permeation of hydrogen through dense mixed conducting composites at elevated temperatures makes them attractive as hydrogen separation membranes. The glycine-nitrate combustion synthesis technique has been used to co-synthesize a cation-doped barium cerate protonic conducting phase together with a metallic nickel electronic conducting phase (15-35 vol% Ni). Co-synthesis of these phases results in an intimately mixed powder with particle sizes on the order of 10 nm. DTA/TGA of all as-synthesized compositions determined that a calcination temperature of 1000°C was required for full reaction of the cerate components. DTA/TGA and sintering shrinkage dilatometry were performed on calcined powders to determine that a sintering temperature of 1250°C would be adequate for achieving >90% relative density in all compositions. Bars of the material containing 25 vol% Ni were reduced at three different points in the heat treatment process (e.g., before, during, or after sintering). It was determined that there was less porosity in the sample reduced during sintering than any other. It was also seen on SEM that the primary grain size, regardless of when reduction occurred compared to sintering of the material, is less than 5 µm.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
901468
Report Number(s):
PNNL-SA-48245
TRN: US200714%%58
DOE Contract Number:
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Processing and manufacturing of advanced materials international conference; THERMEC 2006, Jul 5th, 2006, Vancouver, Canada. Materials Science Forum, 539-543(Part. 2):1413-1420
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; BARIUM; CALCINATION; COMBUSTION; DILATOMETRY; GRAIN SIZE; HEAT TREATMENTS; HYDROGEN; MANUFACTURING; MEMBRANES; NICKEL; PARTICLE SIZE; POROSITY; PROCESSING; SHRINKAGE; SINTERING; SYNTHESIS; mixed-conducting composite; H2 membrane

Citation Formats

Canfield, Nathan L., Crum, Jarrod V., Matyas, Josef, Bandyopadhyay, Amit, Weil, K. Scott, Pederson, Larry R., and Hardy, John S.. Sintering of Mixed-Conducting Composites for Hydrogen Membranes From Nanoscale Co-Synthesized Powders. United States: N. p., 2007. Web.
Canfield, Nathan L., Crum, Jarrod V., Matyas, Josef, Bandyopadhyay, Amit, Weil, K. Scott, Pederson, Larry R., & Hardy, John S.. Sintering of Mixed-Conducting Composites for Hydrogen Membranes From Nanoscale Co-Synthesized Powders. United States.
Canfield, Nathan L., Crum, Jarrod V., Matyas, Josef, Bandyopadhyay, Amit, Weil, K. Scott, Pederson, Larry R., and Hardy, John S.. Fri . "Sintering of Mixed-Conducting Composites for Hydrogen Membranes From Nanoscale Co-Synthesized Powders". United States. doi:.
@article{osti_901468,
title = {Sintering of Mixed-Conducting Composites for Hydrogen Membranes From Nanoscale Co-Synthesized Powders},
author = {Canfield, Nathan L. and Crum, Jarrod V. and Matyas, Josef and Bandyopadhyay, Amit and Weil, K. Scott and Pederson, Larry R. and Hardy, John S.},
abstractNote = {The potential for highly selective, nongalvanic permeation of hydrogen through dense mixed conducting composites at elevated temperatures makes them attractive as hydrogen separation membranes. The glycine-nitrate combustion synthesis technique has been used to co-synthesize a cation-doped barium cerate protonic conducting phase together with a metallic nickel electronic conducting phase (15-35 vol% Ni). Co-synthesis of these phases results in an intimately mixed powder with particle sizes on the order of 10 nm. DTA/TGA of all as-synthesized compositions determined that a calcination temperature of 1000°C was required for full reaction of the cerate components. DTA/TGA and sintering shrinkage dilatometry were performed on calcined powders to determine that a sintering temperature of 1250°C would be adequate for achieving >90% relative density in all compositions. Bars of the material containing 25 vol% Ni were reduced at three different points in the heat treatment process (e.g., before, during, or after sintering). It was determined that there was less porosity in the sample reduced during sintering than any other. It was also seen on SEM that the primary grain size, regardless of when reduction occurred compared to sintering of the material, is less than 5 µm.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Mar 30 00:00:00 EDT 2007},
month = {Fri Mar 30 00:00:00 EDT 2007}
}

Conference:
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