Combined in situ EXAFS and Electrochemical Investigation of the Oxygen Reduction Reaction on Unmodified and Se-Modified Ru/C Научная публикация
Журнал |
Catalysis Today
ISSN: 0920-5861 , E-ISSN: 1873-4308 |
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Вых. Данные | Год: 2009, Том: 147, Номер: 3-4, Страницы: 260-269 Страниц : 10 DOI: 10.1016/j.cattod.2009.01.019 | ||||||
Ключевые слова | Electrochemical oxygen reduction reaction, EXAFS, Reaction kinetics and mechanism, Rotating disc electrode, Ru catalysts, Se-modification, X-ray absorption spectroscopy (XAS) | ||||||
Авторы |
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Организации |
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Информация о финансировании (2)
1 | Federal Ministry of Education and Research | 01 SF 0302 |
2 | The French National Research Agency | ANR-06-CEXC-004 |
Реферат:
In this work we study the kinetics of the oxygen reduction reaction on carbon-supported Ru nanoparticles modified with various amounts of Se. Rotating disk electrode is used to determine kinetic currents for the ORR in 0.1 M H2SO4 at 298 K and O2 partial pressures from 1 to 0.01 atm. The dependence of the ORR activity on Se/Ru ratio shows volcano-type behavior with ca. 10 fold increase of the mass activity at 0.1 < Se/Ru < 0.3. The reaction order in O2 is close to 1 in the interval of overpotentials from 0.4 to 0.7 V, and is independent of the presence of Se. Regardless the amount of Se, the Tafel slope demonstrates continuous increase from ca. 70 mV/dec at 0.4 V to ca. 140 mV/dec at 0.6 V overpotential. In situ EXAFS spectra are measured at Ru K-edge (in the transmission mode) and Se K-edge (in the fluorescence mode) in argon and oxygen saturated 0.1 M H2SO4 solutions in the interval of electrode potentials from 0.050 to 0.750 V RHE. The data are used to explore the surface state changes of Ru and RuxSey particles and clarify the promoting role of Se during the ORR.
Библиографическая ссылка:
Loponov K.N.
, Kriventsov V.V.
, Nagabhushana K.S.
, Boennemann H.
, Kochubey D.I.
, Savinova E.R.
Combined in situ EXAFS and Electrochemical Investigation of the Oxygen Reduction Reaction on Unmodified and Se-Modified Ru/C
Catalysis Today. 2009. V.147. N3-4. P.260-269. DOI: 10.1016/j.cattod.2009.01.019 WOS Scopus РИНЦ
Combined in situ EXAFS and Electrochemical Investigation of the Oxygen Reduction Reaction on Unmodified and Se-Modified Ru/C
Catalysis Today. 2009. V.147. N3-4. P.260-269. DOI: 10.1016/j.cattod.2009.01.019 WOS Scopus РИНЦ
Даты:
Опубликована online: | 23 февр. 2009 г. |
Опубликована в печати: | 15 окт. 2009 г. |
Идентификаторы БД:
Web of science | WOS:000270667500015 |
Scopus | 2-s2.0-69949091271 |
РИНЦ | 15309803 |
Chemical Abstracts | 2009:1127714 |
Chemical Abstracts (print) | 151:516721 |
OpenAlex | W1987404086 |