NDLI: High-temperature proton-conducting ceramics developed

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High-temperature proton-conducting ceramics developed

Content Provider	NASA Technical Reports Server (NTRS)
Author	Dynys, Frederick W. Sayir, Ali
Copyright Year	2005
Description	High-temperature protonic conductors (HTPC) are needed for hydrogen separation, hydrogen sensors, fuel cells, and hydrogen production from fossil fuels. The HTPC materials for hydrogen separation at high temperatures are foreseen to be metal oxides with the perovskite structure A(sup 2+)B(sup 4+)C(sup 2-, sub 3) and with the trivalent cation (M(sup 3+)) substitution at the B(sup 4+)-site to introduce oxygen vacancies. The high affinity for hydrogen ions (H(sup +)) is advantageous for protonic transport, but it increases the reactivity toward water (H2O) and carbon dioxide (CO2), which can lead to premature membrane failure. In addition, there are considerable technological challenges related to the processing of HTPC materials. The high melting point and multi-cation chemistry of HTPC materials creates difficulties in in achieving high-density, single-phase membranes by solid-state sintering. The presence of secondary phases and grain-boundary interfaces are detrimental to the protonic conduction and environmental stability of polycrystalline HTPC materials.
File Size	270514
Page Count	4
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20050217222
Archival Resource Key	ark:/13960/t9t19zv08
Language	English
Publisher Date	2005-06-01
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Protons Solid State Hydrogen Ions Conductivity Polycrystals Conductors Product Development Perovskites High Temperature Ceramics Melting Points Hydrogen Production Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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