Quasi-Elastic Neutron Scattering Reveals Fast Proton Diffusion in Ca-Doped LaPO4

被引：13

作者：

al-Wahish, Amal ^{[1
]}

Jalarvo, Niina ^{[2
]}

Bi, Zhonghe ^{[3
]}

Herwig, K. W. ^{[4
]}

Bridges, Craig ^{[3
]}

Paranthaman, M. P. ^{[3
]}

Mandrus, D. ^{[1
,5
,6
]}

机构：

[1] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[2] Oak Ridge Natl Lab, Forschungszentrum Julich, JCNS, Outstn Spallat Neutron Source SNS, Oak Ridge, TN 37831 USA

[3] Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA

[4] Oak Ridge Natl Lab, Instrument & Source Design Div, Oak Ridge, TN 37861 USA

[5] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[6] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2014年 / 118卷 / 35期

关键词：

CONDUCTION; VISUALIZATION; PRINCIPLES; MECHANISM; DYNAMICS; CRYSTAL;

D O I：

10.1021/jp5048425

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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

引用

页码：20112 / 20121

页数：10

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