Quasi-elastic neutron scattering reveals fast proton diffusion in ca-doped LaPO4

Amal Al-Wahish; Niina Jalarvo; Zhonghe Bi; K. W. Herwig; Craig Bridges; M. P. Paranthaman; D. Mandrus

doi:10.1021/jp5048425

Quasi-elastic neutron scattering reveals fast proton diffusion in ca-doped LaPO₄

Amal Al-Wahish, Niina Jalarvo, Zhonghe Bi, K. W. Herwig, Craig Bridges, M. P. Paranthaman, D. Mandrus

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Abstract

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 °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 °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 °C to 500 °C.

Original language	English
Pages (from-to)	20112-20121
Number of pages	10
Journal	Journal of Physical Chemistry C
Volume	118
Issue number	35
DOIs	https://doi.org/10.1021/jp5048425
State	Published - Sep 4 2014

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title = "Quasi-elastic neutron scattering reveals fast proton diffusion in ca-doped LaPO4",

abstract = "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 °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 °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 °C to 500 °C.",

author = "Amal Al-Wahish and Niina Jalarvo and Zhonghe Bi and Herwig, {K. W.} and Craig Bridges and Paranthaman, {M. P.} and D. Mandrus",

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T1 - Quasi-elastic neutron scattering reveals fast proton diffusion in ca-doped LaPO4

AU - Al-Wahish, Amal

AU - Jalarvo, Niina

AU - Bi, Zhonghe

AU - Herwig, K. W.

AU - Bridges, Craig

AU - Paranthaman, M. P.

AU - Mandrus, D.

PY - 2014/9/4

Y1 - 2014/9/4

N2 - 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 °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 °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 °C to 500 °C.

AB - 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 °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 °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 °C to 500 °C.

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SP - 20112

EP - 20121

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 35

ER -

Quasi-elastic neutron scattering reveals fast proton diffusion in ca-doped LaPO₄

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