A modified DC Hebb–Wagner polarization method for determining the partial protonic electrical conductivity in mixed-conducting BaGd0.3La0.7Co2O6−δ†
*a
Ragnar
Strandbakke,
bc
Kacper
Dzierzgowski,
a
Iga
Szpunar,
d
Aleksandra
Mielewczyk-Gryń,
a
Sebastian
Wachowski
a
and
Maria
Gazda
a
Abstract
In this work, partial protonic conductivity in mixed conducting (BZCY721) and BaGd0.3La0.7Co2O6−δ (BGLC137) was studied. For this purpose, a modified DC Hebb–Wagner polarization method was used. A four-wire type of galvanic cell as well as a suitable calculation model was applied. The method was validated using proton conducting electrolyte – BaZr0.7Ce0.2Y0.1O3−δ – as a reference material. For the first time, protonic partial conductivity in BaGd0.3La0.7Co2O6−δ was determined. It was found that at 600 °C its total conductivity was ∼550 S cm−1, whereas the partial protonic conductivity under the same conditions was 4.4 × 10−5 S cm−1 (protonic transference number of 7.6 × 10−8). Therefore, the proposed measurement cell and the applied model allowed for the determination of a minor protonic conductivity in the BGLC137 electronic conductor.
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