{"title":"Oxygen reduction kinetics of high performance BaCo<sub>0.4</sub>Fe<sub>0.4</sub>M<sub>0.1</sub>Y<sub>0.1</sub>O<sub>3-δ</sub> (M = Mg, Zr) positrode for protonic ceramic fuel cells.","authors":"Hirofumi Sumi, Konosuke Watanabe, Aman Sharma, Masaya Fujioka, Hiroyuki Shimada, Yasunobu Mizutani, Md Saiful Alam, Isao Kagomiya","doi":"10.1038/s42004-025-01468-4","DOIUrl":null,"url":null,"abstract":"<p><p>Protonic ceramic fuel cells (PCFCs) should exhibit high performance at intermediate temperatures in the range of 400-600 °C. To reduce the operating temperature, more active air electrodes (positrodes) are needed. In the present work, BaCo<sub>0.4</sub>Fe<sub>0.4</sub>Mg<sub>0.1</sub>Y<sub>0.1</sub>O<sub>3-δ</sub> (BCFMY) is investigated as a positrode material for application in PCFCs as well as solid oxide fuel cells (SOFCs). For SOFCs, the polarization resistance ascribed to the oxygen reduction reaction is proportional to p<sub>O2</sub><sup>-1/4</sup> (p<sub>O2</sub>: oxygen partial pressure), suggesting that the rate-determining process is the charge transfer on the mixed ionic-electronic conductors. For PCFCs, this polarization resistance is proportional to p<sub>O2</sub><sup>-</sup><sup>1/2</sup>, suggesting that the rate-determining process is the oxygen dissociation. The total polarization resistance for the PCFCs using the BCFMY positrode is 0.066 Ωcm<sup>2</sup> at 600 °C, lower than that using the BaCo<sub>0.4</sub>Fe<sub>0.4</sub>Zr<sub>0.1</sub>Y<sub>0.1</sub>O<sub>3-δ</sub> (BCFZY) positrode. The higher oxygen nonstoichiometry of BCFMY promotes the oxygen dissociation process on the PCFC positrode surface.</p>","PeriodicalId":10529,"journal":{"name":"Communications Chemistry","volume":"8 1","pages":"71"},"PeriodicalIF":6.2000,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11890574/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Communications Chemistry","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1038/s42004-025-01468-4","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
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Abstract
Protonic ceramic fuel cells (PCFCs) should exhibit high performance at intermediate temperatures in the range of 400-600 °C. To reduce the operating temperature, more active air electrodes (positrodes) are needed. In the present work, BaCo0.4Fe0.4Mg0.1Y0.1O3-δ (BCFMY) is investigated as a positrode material for application in PCFCs as well as solid oxide fuel cells (SOFCs). For SOFCs, the polarization resistance ascribed to the oxygen reduction reaction is proportional to pO2-1/4 (pO2: oxygen partial pressure), suggesting that the rate-determining process is the charge transfer on the mixed ionic-electronic conductors. For PCFCs, this polarization resistance is proportional to pO2-1/2, suggesting that the rate-determining process is the oxygen dissociation. The total polarization resistance for the PCFCs using the BCFMY positrode is 0.066 Ωcm2 at 600 °C, lower than that using the BaCo0.4Fe0.4Zr0.1Y0.1O3-δ (BCFZY) positrode. The higher oxygen nonstoichiometry of BCFMY promotes the oxygen dissociation process on the PCFC positrode surface.
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Communications Chemistry is an open access journal from Nature Research publishing high-quality research, reviews and commentary in all areas of the chemical sciences. Research papers published by the journal represent significant advances bringing new chemical insight to a specialized area of research. We also aim to provide a community forum for issues of importance to all chemists, regardless of sub-discipline.
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