Journal Article

FZJ-2015-01763

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Fast Proton Diffusion in Ca-doped LaPO4 studied by Quasi-Elastic Neutron Scattering

al-Wahish, A. ; Jalarvo, N.FZJ* ; Bi, Z. ; Herwig, K. W. ; Bridges, C. A. ; Paranthaman, M. P. ; Mandrus, D. (Corresponding Author)

2014
Soc. Washington, DC

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Please use a persistent id in citations: doi:10.1021/jp5048425

Abstract: We have investigated the diffusion dynamics of protons in hydrated 4.2%Ca-doped LaPO4, a candidate electrolyte for proton-conducting intermediate temperaturefuel cells. The macroscopic and microscopic dynamics have been studied usingelectrochemical impedance spectroscopy (EIS) and quasi-elastic neutron scattering(QENS), respectively. The conductivity of the bulk hydrated sample was determined inthe temperature range of 500−850 °C by EIS and showed a clear signature of protonconductivity with an activation energy of about 1.0 eV. The QENS experiment revealed afast dynamical process below 500 °C that was not observed by EIS. The activation energyof the fast proton diffusion is 0.09 eV in the temperature range from 150 °C to 500 °C.

Keyword(s): Materials Science (2nd) ; Chemistry (2nd)

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Contributing Institute(s):

1. Neutronenstreuung (ICS-1)
2. Neutronenstreuung (Neutronenstreuung ; JCNS-1)
3. JCNS-SNS (JCNS-SNS)

Research Program(s):

1. 54G - JCNS (POF2-54G24) (POF2-54G24)
2. 451 - Soft Matter Composites (POF2-451) (POF2-451)

Appears in the scientific report 2014

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Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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