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A fast ceramic mixed OH−/H+ ionic conductor for low temperature fuel cells
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Journal Article
A fast ceramic mixed OH−/H+ ionic conductor for low temperature fuel cells
2024
Overview
Low temperature ionic conducting materials such as OH
−
and H
+
ionic conductors are important electrolytes for electrochemical devices. Here we show the discovery of mixed OH
−
/H
+
conduction in ceramic materials. SrZr
0.8
Y
0.2
O
3-
δ
exhibits a high ionic conductivity of approximately 0.01 S cm
−1
at 90 °C in both water and wet air, which has been demonstrated by direct ammonia fuel cells. Neutron diffraction confirms the presence of OD bonds in the lattice of deuterated SrZr
0.8
Y
0.2
O
3-
δ
. The OH
−
ionic conduction of CaZr
0.8
Y
0.2
O
3-
δ
in water was demonstrated by electrolysis of both H
2
18
O and D
2
O. The ionic conductivity of CaZr
0.8
Y
0.2
O
3-
δ
in 6 M KOH solution is around 0.1 S cm
−1
at 90 °C, 100 times higher than that in pure water, indicating increased OH
−
ionic conductivity with a higher concentration of feed OH
−
ions. Density functional theory calculations suggest the diffusion of OH
−
ions relies on oxygen vacancies and temporarily formed hydrogen bonds. This opens a window to discovering new ceramic ionic conducting materials for near ambient temperature fuel cells, electrolysers and other electrochemical devices.
Low temperature ionic conducting materials such as OH
-
and H
+
ionic conductors are important electrolyte materials. Here the authors report the discovery of fast mixed OH
-
/H
+
conductors in ceramic materials, SrZr0.8Y0.2O3-δ and CaZr0.8Y0.2O3-δ, for potential use as electrolytes in fuel cells.
