Chemical and Electronic Effects of Ni in Pt/Ni and Pt/Ru/Ni Alloy Nanoparticles in Methanol Electrooxidation
| Autor: | Seong Ahn Hong, and Seol-Ah Lee, Jong-Ho Choi, Hongsun Kim and, Andrzej Wieckowski, Heung-Yong Ha and, Boo-Kil Kwon, Kyung-Won Park, Yung-Eun Sung |
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| Rok vydání: | 2002 |
| Předmět: |
Materials science
Alloy Non-blocking I/O Inorganic chemistry engineering.material Chronoamperometry Surfaces Coatings and Films Catalysis Metal Chemical state X-ray photoelectron spectroscopy visual_art Materials Chemistry engineering visual_art.visual_art_medium Physical and Theoretical Chemistry Cyclic voltammetry |
| Zdroj: | The Journal of Physical Chemistry B. 106:1869-1877 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/jp013168v |
| Popis: | Electrooxidation of methanol in sulfuric acid solution was studied using Pt, Pt/Ni(1:1 and 3:1), Pt/Ru/Ni(5:4:1 and 6:3.5:0.5), and Pt/Ru(1:1) alloy nanoparticle catalysts, in relation to methanol oxidation processes in the direct oxidation methanol fuel cell. The Pt/Ni and Pt/Ru/Ni alloys showed excellent catalytic activities compared to those of pure Pt and Pt/Ru. The role of Ni as a catalytically enhancing agent in the oxidation process was interrogated using cyclic voltammetry, chronoamperometry, X-ray photoelectron spectroscopy, transmission electron microscopy, and X-ray diffraction. X-ray diffraction data showed alloy formation for all Pt/Ni, Pt/Ru/Ni, and Pt/Ru nanoparticles, whereas X-ray photoelectron spectroscopy confirmed that chemical states of Pt were exclusively metallic. The presence of metallic Ni, NiO, Ni(OH)2, NiOOH, metallic Ru, RuO2, and RuO3 was also confirmed. We found that the Pt4f binding energies for the Pt/Ni and Pt/Ru/Ni alloy nanoparticles were lower than those for clean Pt na... |
| Databáze: | OpenAIRE |
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