High Temperature Polymer Electrolyte Fuel Cells (HT-PEFCs) have been studied with quasielastic neutron scattering, which gives access to the proton diffusion in the fuel cell on local length- and timescales. So far, the different components such as the proton conducting membrane and the electrode layers have been studied separately. Here we show that also operating fuel cells can be investigated and the proton diffusion can be measured under real working conditions. The proton diffusion during power production is compared to that “at rest” but at elevated temperatures.

1.
O.
Holderer
 et al,
Int. J. Hydrogen Energy
39
(
2014
),
21657
21662
2.
J.S.
Wainright
 et al,
J. Electrochem. Soc.
142
(
1995
),
L121
L123
3.
Q.
Li
 et al,
Progress in Polymer Science
34
(
2009
)
449
477
4.
T.
Arlt
 et al,
Journal of Power Sources
299
(
2015
)
125
129
5.
T.
Arlt
 et al,
Journal of Power Sources
246
(
2014
)
290
298
6.
A.
Radulescu
 et al,
J. Phys.: Conf. Series
351
(
2012
)
012026
7.
J.
Wuttke
 et al,
Rev. Sci. Instruments
83
(
2012
)
075109
8.
M.
Khaneft
 et al,
Fuel Cells
16
(
2016
)
406
413
9.
O.
Holderer
 et al,
ECS Transactions
69
(
2015
)
337
343
10.
G.
Ehlers
, in
F.
Mezei
,
C.
Pappas
,
T.
Gutberlet
(Eds.),
Neutron Spin Echo Spectroscopy
, LNP
601
(
2003
)
Springer, Berlin
11.
O.
Ivanova
 et al,
J. Membrane Sci.
(
2017
), doi:
12.
J.-P.
Melchior
 et al,
Phys. Chem. Chem. Phys.
,
19
(
2017
)
601
13.
J.-P.
Melchior
 et al,
Phys. Chem. Chem. Phys.
,
19
(
2017
)
587
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