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
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&...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-10-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/11/10/766 |
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| author | Jack H. Duffy Yuqing Meng Harry W. Abernathy Kyle S. Brinkman |
| author_facet | Jack H. Duffy Yuqing Meng Harry W. Abernathy Kyle S. Brinkman |
| author_sort | Jack H. Duffy |
| collection | DOAJ |
| description | 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 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 O<sup>2−</sup> conduction while improving the oxygen reduction surface reaction, suggesting better electrode performance for proton-conducting systems with greater Y substitution. |
| first_indexed | 2024-03-10T06:23:55Z |
| format | Article |
| id | doaj.art-59450b6aa67b413a960604e405252f10 |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-10T06:23:55Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-59450b6aa67b413a960604e405252f102023-11-22T19:06:18ZengMDPI AGMembranes2077-03752021-10-01111076610.3390/membranes11100766Surface 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 MaterialsJack H. Duffy0Yuqing Meng1Harry W. Abernathy2Kyle S. Brinkman3Department of Materials Science and Engineering, Clemson University, Clemson, SC 29634, USADepartment of Materials Science and Engineering, Clemson University, Clemson, SC 29634, USANational Energy Technology Laboratory, Morgantown, WV 26505, USADepartment of Materials Science and Engineering, Clemson University, Clemson, SC 29634, USATriple 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 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 O<sup>2−</sup> conduction while improving the oxygen reduction surface reaction, suggesting better electrode performance for proton-conducting systems with greater Y substitution.https://www.mdpi.com/2077-0375/11/10/766triple ionic-electronic conductoroxygen permeation membraneelectrical conductivity relaxation |
| spellingShingle | Jack H. Duffy Yuqing Meng Harry W. Abernathy Kyle S. Brinkman 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 Membranes triple ionic-electronic conductor oxygen permeation membrane electrical conductivity relaxation |
| title | 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| topic | triple ionic-electronic conductor oxygen permeation membrane electrical conductivity relaxation |
| url | https://www.mdpi.com/2077-0375/11/10/766 |
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