| Autor: |
S Durón, P. Nkeng, R. Rivera-Noriega, Omar Solorza-Feria, G. Poillerat |
| Rok vydání: |
2004 |
| Předmět: |
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| Zdroj: |
Journal of Electroanalytical Chemistry. 566:281-289 |
| ISSN: |
1572-6657 |
| DOI: |
10.1016/j.jelechem.2003.11.065 |
| Popis: |
Electrocatalytic activity for molecular oxygen reduction on nanoparticles of ruthenium mixed with Nafion ® in 0.5 M H 2 SO 4 was studied. The electrocatalytic material was synthesized by pyrolysis of Ru 3 (CO) 12 in sealed ampoules at 190 °C for 3 h. The product of the pyrolysis was characterized by DSC, FTIR, XRD, SEM (EDX), TEM and also electrochemically. X-ray diffraction and TEM studies indicated that the synthesized powder presents a nano-crystalline structure. The electrochemical results obtained by rotating disk electrode (RDE) and rotating ring-disk electrode (RRDE) techniques show that the oxygen reduction reaction take place by a multi-electronic charge transfer process ( n =4e − ) with the formation of ca. 4.5% of hydrogen peroxide. A Tafel slope of ca. −100 mV dec −1 and an exchange current density of 7.9 × 10 −7 mA cm −2 were deduced. The kinetics of the reduction reaction were evaluated in the potential range of 0.7–0.0 V (SHE) through a simple Damjanovic model. Further interpretation of the analysis of the kinetic results in the light of Anastasijevic's procedure is also presented. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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