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Surface and Bulk Oxygen Kinetics of BaCo0.4Fe0.4Zr0.2-XYXO3-δ Triple Conducting Electrode Materials.


ABSTRACT: Triple ionic-electronic conductors have received much attention as electrode materials. In this work, the bulk characteristics of oxygen diffusion and surface exchange were determined for the triple-conducting BaCo0.4Fe0.4Zr0.2-XYXO3-δ suite of samples. Y substitution increased the overall size of the lattice due to dopant ionic radius and the concomitant formation of oxygen vacancies. Oxygen permeation measurements exhibited a three-fold decrease in oxygen permeation flux with increasing Y substitution. The DC total conductivity exhibited a similar decrease with increasing Y substitution. These relatively small changes are coupled with an order of magnitude increase in surface exchange rates from Zr-doped to Y-doped samples as observed by conductivity relaxation experiments. The results indicate that Y-doping inhibits bulk O2- conduction while improving the oxygen reduction surface reaction, suggesting better electrode performance for proton-conducting systems with greater Y substitution.

SUBMITTER: Duffy JH 

PROVIDER: S-EPMC8537876 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature

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Surface and Bulk Oxygen Kinetics of BaCo<sub>0.4</sub>Fe<sub>0.4</sub>Zr<sub>0.2-X</sub>Y<sub>X</sub>O<sub>3-δ</sub> Triple Conducting Electrode Materials.

Duffy Jack H JH   Meng Yuqing Y   Abernathy Harry W HW   Brinkman Kyle S KS  

Membranes 20211005 10


Triple ionic-electronic conductors have received much attention as electrode materials. In this work, the bulk characteristics of oxygen diffusion and surface exchange were determined for the triple-conducting BaCo<sub>0.4</sub>Fe<sub>0.4</sub>Zr<sub>0.2-X</sub>Y<sub>X</sub>O<sub>3-δ</sub> suite of samples. Y substitution increased the overall size of the lattice due to dopant ionic radius and the concomitant formation of oxygen vacancies. Oxygen permeation measurements exhibited a three-fold de  ...[more]

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