| Autor: |
Watanabe, Keita, Matsuzawa, Koichi, Takeuchi, Yuu, Ikegami, Kaoru, Ohgi, Yoshiro, Nagai, Takaaki, Monden, Ryuji, Ishihara, Akimitsu |
| Zdroj: |
ECS Transactions; September 2022, Vol. 109 Issue: 9 |
| Abstrakt: |
Fe-added zirconium oxide catalysts were synthesized by using pyrazine carboxylic acid to enhance oxygen reduction reaction (ORR) activity in acidic media. Fe-added zirconium oxide with a Fe/Zr atomic ratio of 0.1 showed highest ORR onset potential, 0.917 V vs. reversible hydrogen electrode among other zirconium oxide-based catalysts including the previous study. High quality active sites for ORR might be created by substitution of Zr4+ by Fe3+ in ZrO2 monoclinic structure. Although no use of carbon support caused a large particle size of zirconium oxides approximately 20~200 nm, the ORR activity drastically increased because of the creation of high quality active sites. We found that a positive correlation between a ratio of ZrO2 monoclinic structure and ORR activity. As a result, the use of pyrazine carboxylic acid was useful to create high quality active sites and a suitable electron conduction path. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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