Operando X-ray Absorption Spectroscopic Study on the Effect of Ionic Liquid Coverage upon the Oxygen Reduction Reaction Activity of Pd-core Pt-shell Catalysts
| Autor: | Minoru Inaba, Kentaro Yamamoto, Koichiro Oshima, Jyunichi Ishihara, Tomoki Uchiyama, Yoshiharu Uchimoto, Shigeki Sakurai, Hideto Imai, Toshiki Watanabe, Chen Liu |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
oxygen reduction reaction
operando x-ray absorption spectroscopy Technology Materials science Inorganic chemistry Physical and theoretical chemistry QD450-801 Shell (structure) X-ray polymer electrolyte membrane fuel cells Catalysis Core (optical fiber) chemistry.chemical_compound chemistry Ionic liquid Electrochemistry Oxygen reduction reaction Absorption (chemistry) ionic liquid |
| Zdroj: | Electrochemistry, Vol 89, Iss 1, Pp 31-35 (2021) |
| ISSN: | 2186-2451 |
| Popis: | This study provides evidence of the enhancement of the oxygen reduction reaction (ORR) activity of Pt/C and Pd-core Pt-shell catalysts upon ionic liquid modification. Under high potential at 1.15 V (vs. reversible hydrogen electrode), the lower coverage of the oxide species on the Pt surface modified with [7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene (MTBD)][bis(trifluoromethylsulfonyl)imide (NTf2)] ionic liquid (IL) was confirmed by electrochemical analysis. Operando X-ray absorption spectra (XAS) of the ionic liquid-modified Pd-core Pt-shell catalyst displayed smaller 5d orbital vacancies than the naked catalyst. Shrinkage of Pt-Pt bond length was also displayed, indicating the suppression of oxidation. Thus, we conclude that the IL-modified systems are effective in avoiding the adsorption of oxide species on the Pt surface and improving the oxygen reduction activity. |
| Databáze: | OpenAIRE |
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