Methanol electrooxidation at mesoporous Pt and Pt–Ru electrodes: A comparative study with carbon supported materials
| Autor: | Alberto Hernández-Creus, Elena Pastor, Gabriel A. Planes, Gonzalo García, Jonathan Flórez-Montaño |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Inorganic chemistry Energy Engineering and Power Technology chemistry.chemical_element Electrochemistry Redox Catalysis chemistry.chemical_compound Adsorption chemistry Electrode Methanol Electrical and Electronic Engineering Physical and Theoretical Chemistry Mesoporous material Carbon |
| Zdroj: | Journal of Power Sources. 196:2979-2986 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2010.11.085 |
| Popis: | The electrochemical behaviour of fuel cell catalysts (mesoporous Pt (MPPt), MPPtRu, MPPt modified by adsorbed Ru (MPPt/Ru) and carbon supported PtRu alloy) was studied using the thin layer flow cell differential electrochemical mass spectrometry (TLFC-DEMS) technique. The catalysts present high catalytic activity towards the methanol oxidation reaction (MOR), being the PtRu/C electrode the least active for MOR, while MPPt/Ru presents higher current densities for this reaction than MPPtRu. The results suggest that the diffusion properties obtained in the porous structure of the MP electrodes and the surface atomic arrangement in the electrode are the main reasons for the higher catalytic activity achieved. Finally, TLFC-DEMS was proved to be a powerful technique which evaluates and correlates the CO 2 efficiency with the catalytic activity and the porous structure of the catalysts. |
| Databáze: | OpenAIRE |
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